svl350-model gto dry pipe valves - kidde gto.pdf · nitrogen source, or from a manually operated...

www.Kidde-Fire.com

"Automatic" Sprinkler

150 Gordon Drive

Exton, PA 19341 USA

Tel: (610) 363-1400

800-626-2682

Fax: (610) 524-9073

800-858-6857

#SVL350 - Model GTO Dry Pipe Valves

123456Fire Protection Equipment

i SVL350

TABLE OF CONTENTS

Text Page

General ................................................................................................................................................................... 1

Approvals ................................................................................................................................................................ 1

Description / Operation .......................................................................................................................................... 1

Technical Data ........................................................................................................................................................ 2

Figure 1 - Operation Diagram: Model GTO Dry Pipe Valve Set Position .......................................................... 3

Figure 2 - Operation Diagram: Model GTO Dry Pipe Valve Operating Position ................................................ 3

Ordering Information .............................................................................................................................................. 4

"Automatic" 4” Model GTO Dry Pipe Valve Assembly - Parts List ....................................................................... 5

"Automatic" 6” Model GTO Dry Pipe Valve Assembly - Parts List ....................................................................... 6

"Automatic" 4” Model GTO Dry Pipe Valve - Basic Trim Setup 39-5B

with Manual Control Connections - without Accelerator - Parts Drawing & List ........................................... 7

"Automatic" 4” Model GTO Dry Pipe Valve - Trim Options .................................................................................. 8

"Automatic" 6” Model GTO Dry Pipe Valve - Basic Trim Setup 39-8D

with Manual Control Connections - without Accelerator - Parts Drawing & List ........................................... 9

"Automatic" 6” Model GTO Dry Pipe Valve - Trim Options ................................................................................ 10

Air Supply Connections ........................................................................................................................................ 11

Owner’s Air Supply - Automatic .................................................................................................................... 11

Nitrogen Cylinder Air Supply - Automatic (Air Pressure Maintenance Device) .......................................... 11

Calculating Nitrogen Requirement ................................................................................................................ 11

"Automatic" Accelerator Model 1 ......................................................................................................................... 12

General Description ....................................................................................................................................... 12

Installation ...................................................................................................................................................... 12

Operation ....................................................................................................................................................... 13

Procedure for Operational Testing of Accelerator Model 1 (85-100) .......................................................... 14

Resetting Procedure ...................................................................................................................................... 14

Accelerator Field Repairs .............................................................................................................................. 15

"Automatic" Accelerator Model 1 - Replacement Parts List & Drawing .................................................... 15

Air Pressure Maintenance Device Mode A-1 ...................................................................................................... 16

General Description ....................................................................................................................................... 16

Maintenance ................................................................................................................................................... 16

Air Pressure Maintenance Device Mode A-1 - Replacement Parts List & Drawing .................................. 17

SVL350 ii

Velocity Check Valve 39-300 and Replacement Kit 39-310 .............................................................................. 18

Trouble Alarm Silencing Panel ............................................................................................................................ 18

Model 39-740A - Manual Resetting Type ........................................................................................................ 18

Testing and Maintenance ..................................................................................................................................... 19

Testing ............................................................................................................................................................ 19

Testing Waterflow Alarm Devices ............................................................................................................. 19

Testing Low-Air Pressure Alarm Devices ................................................................................................. 19

Flow Test at Main Drain Valve (Main Drain Test) ...................................................................................... 19

Trip Testing of Dry Valve ........................................................................................................................... 20

Trip Test- Partial Flow ............................................................................................................................... 20

Trip Test- Full Flow ................................................................................................................................... 20

Tags / Records ......................................................................................................................................... 21

Maintenance ................................................................................................................................................... 21

Clapper Facing ......................................................................................................................................... 21

Seat Rings ................................................................................................................................................ 21

Velocity Check Valve ................................................................................................................................ 21

Accelerator ............................................................................................................................................... 21

Antiflooding Device ................................................................................................................................... 21

Alarm Line Strainer ................................................................................................................................... 21

Alarm Test Valve, Main Drain Valve, Inspectors Test & Air Supply Control Valve (Manual Setup) ............ 21

System Control Valve, Alarm Control Valve & Air Supply Control Valve (Automatic Setup) ...................... 22

Dry Valve & Trim ....................................................................................................................................... 22

Air Maintenance Device or Automatic Control Connections ..................................................................... 22

Air Compressor ........................................................................................................................................ 22

Air Pressure.............................................................................................................................................. 22

Priming Water Level ................................................................................................................................. 22

Valve Enclosure ........................................................................................................................................ 22

System Low Points ................................................................................................................................... 22

Resetting of System ................................................................................................................................. 23

MODEL GTO

Dry Pipe Valves

DATA SHEET

#SVL350

www.Kidde-Fire.com

GeneralThe “Automatic” Model GTO Dry Pipe Valve is a waterflow

control/alarm device designed for installation in the main

supply to a dry pipe sprinkler system. Its purpose is two-

fold.

First, it holds back the water, keeping it from flowing into

the system until such time that sprinklers operate. This

function is accomplished by the special design of the valve

(see Description / Operation).

Second, it provides the means to actuate a fire alarm when

the flow of water from the system equals or exceeds that

of a single sprinkler. The alarm may be accomplished in

two ways: (1) mechanically by means of a water flow to a

water motor alarm and/or (2) electrically via a water-pres-

sure-actuated alarm switch (circuit closer) connected to

an electrically operated signaling device such as a bell or

light.

The Model GTO Dry Pipe Valve is made in two sizes: 4"

(101.6 mm) and 6" (152.4 mm).

Note: In the general discussion, the terms dry pipe valve

and dry valve are used interchangeably; and so are the

terms dry pipe system and dry system.

Each dry valve is provided with a basic trim package that

includes manual air supply connections, priming connec-

tions, drain connections, alarm outlets and an alarm test

by-pass. Optional trim packages are available to provide

connections for an automatic air supply, or for a manual or

automatic nitrogen supply. Alarm and supervisory devices

may be provided separately.

A trim package is available to add the "Automatic" Model 1

Accelerator to the Model GTO Dry Valve. This quick-open-

ing device is required when the system capacity exceeds

500 gallons (per NFPA 13). See NFPA 13 for exceptions.

ApprovalsModel GTO Dry Pipe Valves are listed or approved by the

various testing and inspection organizations concerned

with product evaluation. These include:

• Underwriters Laboratories (UL)

• Factory Mutual (FM)

• Underwriters Laboratories of Canada (ULC)

These valves are listed/approved with specific trim and for

installation in accordance with the applicable requirements

of NFPA 13. Therefore, no substitutions or omissions, in

part or in full, are allowed. For the particular listings and/or

approvals of each dry valve, refer to Technical Data sec-

tion of this data sheet.

The Model 1 Accelerator is listed and approved for use

specifically with the Model GTO Dry Pipe Valves.

All devices are listed/approved for a maximum water work-

ing pressure (WWP) of 175 psi (1206.6 kPa or 12.1 bar).

Description / OperationThe Model GTO Dry Pipe Valve is a differential type valve

having an intermediate chamber. Its design is such that a

relatively low air pressure may be used to keep the clap-

per closed against a higher water supply pressure.

In the set position (see Figure 1), the rubber-faced clap-

per closes tightly on two concentric seat rings. The inner

ring is the water seat ring; the outer is the air seat ring.

The annular space between the two rings is the intermedi-

ate chamber. When the valve is in service (set), this cham-

ber is open to the atmosphere through the velocity check

valve.

Priming water is provided above the clapper up to the levelof the air supply connections. Above the priming water level,compressed air (or nitrogen) is maintained at a pressuresufficient to keep the clapper closed. The purpose of the

123456

2 SVL350

priming water is to provide a positive seal to prevent air

from escaping through the intermediate chamber. The air

pressure, then, acting on the priming water over the larger

area above the clapper, offsets the higher water pressure

acting on a smaller area below the clapper (area of the

larger air seat ring versus the area of the smaller water

seat ring). The clapper will remain in the closed position

as long as the air pressure in the system is maintained at

the proper level. For air pressures to be used for various

water supply pressures, see Maintenance - Air Pressure.

When a sprinkler operates, the system loses its air pres-

sure through the opened sprinkler. This loss lowers the

system pressure to a point where it can no longer keep

the dry valve closed. The water supply pressure, then, lifts

the dry valve clapper and forces it up into the open or op-

erated position (see Figure 2). Water flows into the sys-

tem and on to the opened sprinkler(s). At the same time,

water flows into the intermediate chamber, closes the ve-

locity check valve, then continues on via the alarm line

connections to sound the water motor alarm and/or oper-

ate the pressure-actuated alarm switch.

The Model GTO Dry Pipe Valve has a trip ratio of approx-

imately 6 to 1. This means that the valve will open (trip)

when the air pressure in the system is reduced to about

one-sixth of the water supply pressure.

On large systems, it can take longer to lower the air pres-

sure to the trip point of the dry valve. To speed up the

operation of the valve, a quick-opening device (QOD) is

required. The QOD used with the Model GTO Dry Valve is

the Model 1 Accelerator. Its operation with the valve is as

follows:

When a sprinkler operates, the accelerator responds to

the rapid drop in air pressure. It opens and allows the re-

maining air pressure to pass to the intermediate chamber

of the dry valve where it assists the water pressure in over-

coming the pressure differential. In the intermediate cham-

ber, the redirected air pressure acts on the underside of

the clapper in the area between the air and the water seat

rings while the water pressure is acting on the area within

the water seat ring. Together, then, the air and water pres-

sures overcome the air pressure acting alone on top of the

clapper. This forces the clapper to open quickly. The op-

eration of the dry valve has been accelerated.

Technical DataAvailable Sizes: .................. • 4" (101.6 mm)

• 6" (152.4 mm)

Inlet & Outlet: ...................... Class 125 Flanged Inlet

with Grooved Outlet (per

ANSI/AWWA C606)

Water Working Pressure: .... 175 psi (1206.6 kPa or

12.1 bar)

Basic Trim Setup: ............... With Manual Control

Connections

Trim Options: ..... • Automatic Control Connections

• Air Maintenance Device

• Nitrogen Cylinders & Connections

• Accelerator/Accelerator Trim Options

Listings & Approvals: .......... • UL Listed

• FM Approved

• ULC Listed

Pressure Loss:

For use in hydraulic calculations, the pressure loss through

the alarm valve may be expressed as equivalent feet of

pipe:

• 4" Valve = 22 Ft

• 6" Valve = 26 Ft

Conversion Factors:

• 1 inch = 25.4 millimeters (mm)

• 1 psi = 6.895 kilopascals (kPa)

0.0689 bar

• 1 gallon = 3.785 liters (L)

� � ��

� ��

� � ��

� ��

� � � � � � �

� � ��

� � ��

� ��

� � ��

� ��

� � � ��

� � ��

� � � ��

� � ��

��

� � � � � � � � � � � � � � � � � � �

��

��

Pressure Loss Curves

SVL350 3

4 SVL350

Ordering Information• "Automatic" Model GTO Dry Pipe Valves

4" Model GTO 6" Model GTO

Item/SetupSymbol

Number

Part

Number

Symbol

Number

Part

Number

Dry Pipe Valve only (without trim) 39-500 8039500 39-800 8039800

Basic Trim setup for Dry Pipe Valve:

Manual Control Connections – for supply from owner’s air or

Nitrogen source, or from a manually operated air compressor. 39-4B 1404800 39-6D 1404860

Trim Option for Accelerator ( less Accelerator):

Note: Accelerator is to be ordered separately and in addition to thetrim option.

Accelerator – “Automatic” Model 1

39-441 8039441 39-642 8039642

Trim Options for Air/Nitrogen Supply Connections:

Automatic Control Connections – to connect to Basic Trim Setup –for supply from an automatic air compressor serving one dry systemonly.

Air Maintenance Device - “Automatic” Model A-1 – to connect toBasic Trim Setup – to provide automatic control from owner’s air ornitrogen source, or from an automatic air compressor serving one ormore systems.

Nitrogen Cylinders & Connections – nitrogen supply source toconnect to manual control setup (Basic Trim Setup) or to automaticcontrol setup (Basic Trim Setup with Air Maintenance Device).

39-ACC

39-760

39-ON

1404861

8039760

1404819

39-ACC

39-760

39-ON

1404861

8039760

1404819

Optional Alarms:

Note: Connections for an Alarm Switch and a Low Air Pressure AlarmSwitch are included as part of the Basic Trim Setup. The switches,however, must be ordered separately.

- - - -

"Automatic" Model GTO Dry Pipe Valves

SVL350 5

"Automatic" 4" Model GTO Dry Pipe Valve Assembly

Parts List• "Automatic" 4” Model GTO Valve Assemblies - Symbol No. 39-500

4” Valve

Item

Number Part Name Material

Symbol

Number

Part

Number

1

2

3

Valve Body Subassembly

Body

Water Seat Ring †

Air Seat Ring †

Cast Iron

Brass

Brass

S39-501

-

-

-

8039501

-

-

-

•

•

•

•

•

•

Handhole Cover

Nameplate

Drive Screws: #0 x ¼” – 2 required

Handhole Gasket

Stud Bolts – 5/8” – 11 x 2-1/4” Long – 10 required

Hex Nuts – 5/8” – 11 – 10 required

Cast Iron

Aluminum

Steel

Rubber

39-402

-

-

39-425

-

-

8039402

-

-

8039425

1402362

1600749

4

5

6

7

8

9

10

Clapper Subassembly

Clapper

Clapper Facing

Facing Retaining Ring

Retaining Ring Screws

3/8” – 16 x 7/8” long – 6 required

Clapper Latch

Latch Pin

Cotter Pins – 2 required

Bronze

Rubber

Brass

Brass

Bronze

Monel

Brass

S39-430

39-543

39-424

39-405

39-406

39-418

8039430

8039403

1039424

8039405

1420155

8039406

8039418

1417143

11

12

13

Hinge Pin

Hinge Pin Bushings (2 in Body)†

3/4 Plug

Brass

Brass

Brass

39-416

-

-

8039416

-

2096104

14 Velocity Check Valve Assembly 39-300 8039300

15

16

Stud Bolts – 5/8” – 11 x 2-3/4” long – 4 required


Steel

Steel

-

-

1402363

1600749

• Handhole cover and related items are not shown in detail. Special Note: When a complete valve assembly is

† These items are not field replaceable. provided, the Velocity Check Valve Assembly (14),

Stud Bolts (15) and Nuts (16) are boxed separately

and placed inside the valve for shipment.

6 SVL350

"Automatic" 6" Model GTO Dry Pipe Valve Assembly

Parts List• "Automatic" 6” Model GTO Valve Assemblies - Symbol No. 39-800

6” Valve

Item

Number Part Name Material

Symbol

Number

Part

Number

1

2

3

Valve Body Subassembly

Body

Water Seat Ring †

Air Seat Ring †

Cast Iron

Brass

Brass

S39-801

-

-

-

8039151

-

-

-

•

•

•

•

•

Handhole Cover

Nameplate

Drive Screws: #0 x ¼” – 2 required

Handhole Gasket

Hex Head Cap Screws – 3/4” – 10 x 1-3/4” – 10 required

Cast Iron

Aluminum

Steel

Rubber

Steel

39-602A-1

-

-

39-625

-

8039152

-

-

8039175

1420125

4

5

6

7

8

9

10

11

12

Clapper Subassembly

Clapper

Clapper Facing

Facing Retaining Ring

Retaining Ring Screws – 12 required

Clapper Latch

Latch Pin

Cotter Pins – 2 required

Latch Spring

Hinge Pin Bushings (2 in Clapper) †

Ductile Iron

Rubber

Cast Iron

Brass

Bronze

Monel

Brass

Bronze

Brass

S39-603-4

39-603-1

39-624A

39-605

39-612

39-606C

39-618A

-

39-628A

-

8039604

8039603

1039625

8039157

8039162

8039156

8039168

1417143

1039628

-

13

14

15

Hinge Pin

Hinge Pin Bushings (2 in Body)†

3/4” Plug

Stainless Steel

Brass

Brass

39-616-1

-

-

8039616

-

2096104

16 Velocity Check Valve Assembly - 39-300 8039300

17

18

Stud Bolts – 3/4” – 10 x 3” long – 4 required


Steel

Steel

-

-

1402371

1600750

• Handhole cover and related items are not shown in detail. Special Note: When a complete valve assembly is

† These items are not field replaceable. provided, the Velocity Check Valve Assembly (16),

Stud Bolts (17) and Nuts (18) are boxed separately

and placed inside the valve for shipment.

SVL350 7

"Automatic" 4" Model GTO Dry Pipe Valve

Basic Trim Setup 39-4B

with Manual Control Connections - without Accelerator

8 SVL350

"Automatic" 4" Model GTO Dry Pipe Valve - Trim Options

SVL350 9

"Automatic" 6" Model GTO Dry Pipe Valve

Basic Trim Setup 39-6D

with Manual Control Connections - without Accelerator

10 SVL350

"Automatic" 6" Model GTO Dry Pipe Valve - Trim Options

SVL350 11

Note: The Orifice By-Pass Valve must be normally closedor valve operation will be serously impaired. The two iso-lating valves (normally open) are closed only to servicethe Air-Pressure Maintenance Device between them.

The Air Pressure Relief Valve is set at 5 psi above maxi-mum permissible pressure to assure against excessive

pressure in Dry Pipe System.

Calculating Nitrogen Requirement

1. Calculate system capacity in gallons using table be-

low:

Pipe Gal. Pipe Gal. Pipe Gal.

Size Per Ft. Size Per Ft. Size Per Ft.

1 .045 2-1/2 .248 5 1.04

1-1/4 .078 3 .383 6 1.50

1-1/2 .106 3-1/2 .513 8 2.66

2 .174 4 .660

Sch. 40 pipe for 1” thru 6”.

Sch. 80 pipe for 8”.

2. Determine Pressure requirement.

3. Read across bottom to point including system capac-ity, then up to line past pressure requirement curveintersection. At left the number of cylinders needed isgiven. Be sure to order enough spares to refill systemin case of operation.

Owner’s Air Supply - Automatic

Automatic control connections for Owner’s Air or Nitrogensource automatically maintains proper pressure from thesesupplies to the dry pipe valve. Automatic control is pro-vided by the Model A-1 Air Pressure Maintenance Device

(see separate section for this unit).

Nitrogen Cylinder Air Supply - Automatic

(Air Pressure Maintenance Device)Air Supply connections for Nitrogen Cylinder-Automatic arethe same as for owner’s Air Supply-Automatic. The Cylin-der connections are ordered and furnished separately.

Air Supply Connections

�� !

" #

� �� !

" #

� � �! " #

� �! " #

� � !" #�

�

�

�

� � � � � � � � � � � � � � � � � � � � � � � � � � �

$��%�$�&��'(��)��

'��&��&��#

��&��!"#

�

12 SVL350

General DescriptionAn accelerator is an accessory device used on large dry

pipe systems to hasten dry valve operation. NFPA Pam-

phlet 13 requires that each standard dry valve controlling

a system with a capacity of more than 500 gallons must

be provided with an accelerator.

In a fire condition, the accelerator redirects air pressure

from the system piping into the intermediate chamber of

the dry pipe valve. This air pressure assists the water pres-

sure to overcome the pressure differential and opens the

dry pipe valve.

The Model 1 Accelerator is UL Listed and FM Approved

for use with the "Automatic" Model GTO Dry Pipe Valve.

"Automatic" Accelerator Model 1

InstallationAn accelerator is an accessory device used on large dry

pipe systems to hasten dry valve operation. NFPA Pam-

phlet 13 requires that each standard dry valve controlling

a system with a capacity of more than 500 gallons must

be provided with an accelerator.

See figure below.

Accelerator Connections

SVL350 13

Operation(See Figure 1)

Under normal conditions. the valve spring keeps the ex-

haust valve seat up against its seat rirlg with equal pres-

sure from the piping system above and below the dia-

phragm.

Air pressure from the sprinkler piping can freely pass to

the underside of the diaphragm through a hole. Air pres-

sure can seep slowly into the accelerator dome through

the restricted orifice formed by the restriction pin and the

stem of the dome plunger. With the exhaust valve up

against its seat, air pressure cannot pass into the interme-

diate chamber.

(See Figure 2)

Operation of the exhaust valve occurs when an opened

sprinkler causes sudden pressure drop in system piping.

When a sharp pressure drop occurs, it does not affect the

air pressure in the dome immediately. Therefore, the greater

pressure in the dome opens the exhaust valve and per-

mits air pressure to pass in into the intermediate chamber.


Figure 1

Figure 2

Accelerator Dome

Foam Sprinkler Piping

Exhaust Valve

Valve Spring Accelerator Dome

To Intermediate Chamber

Restriction Pin

Diaphragm Plunger

14 SVL350

Procedure for Operational Testing of

Accelerator Model 1 (85-100)

Before proceeding with test, make certain that accelerator

shut-off valve is open and that the 250 psi air pressure

gages on top of the accelerator dome and in the air supply

priming line are equalized at system air pressure.

1. Close controlling gate valve.

2. Open 2" main drain to relieve pressure under clapper.

3. Close accelerator shut-off valve.

Note: If there are leaks of sufficient magnitude in

the joints between the shut-off valve and the

accelerator, accelerator operation may occur

upon closing the shut-off valve.

4. Slowly, loosen 1/2" union between the accelerator shut-

off valve and the accelerator.

5. Accelerator operation can be detected by the audible

tripping of the accelerator followed by decreasing ac-

celerator dome pressure.

6. Retighten 1/2" union between accelerator shut-off

valve and accelerator.

7. Slowly open accelerator shut-off valve while listening

for air discharge through the velocity check. The sound

of air escaping through the velocity check will insure

that the accelerator has operated.

8. After allowing accelerator dome pressure to drop suf-

ficiently below system air pressure, fully open accel-

erator shut-off valve and allow accelerator dome

pressure to equalize.

9. Bring system to proper air pressure.

10. Close 2" main drain.

11. Open controlling gate valve.


Resetting Procedure

If an Accelerator, Model 1, is used with the dry pipe sprin-

kler system it must be cleaned and reset as follows:

1. Remove bottom plug and attached spring, exhaust

valve seat, and restriction pin.

2. Carefully clean rubber seat of exhaust valve, exhaust

valve seat rings, and restriction pin making sure that

no foreign matter adheres to them and that they are

not damaged. Use smoking pipe cleaner to clean pas-

sage in diaphragm plunger and make sure that all water

is drained from the accelerator dome. Removal of the

accelerator air gage provides an opening to atmo-

sphere so that the dome can be drained.

3. Replace bottom plug and related parts. If bottom plug

gasket is not in good condition, replacement is neces-

sary.

4. Make sure accelerator shut-off valve is open.

After allowing about one-half hour to lapse, check air gage

mounted on accelerator dome to see that accelerator dome

pressure has equalized with sprinkler piping pressure.

SVL350 15

Accelerator Field Repairs1. Remove accelerator from dry pipe valve after first shut-

ting off the water supply and bleeding the air from the

system.

2. Remove bottom plug 85-3 and restriction pin screw

85-9.

3. Remove restriction pin S85-103 being careful not to

bend, and exhaust valve S85-102.

4. Remove lower chamber S85-101 A from dome 85-19.

5. Remove retaining ring screws 1420274 and diaphragm

retaining ring 85-5.

6. Remove diaphragm 85-12, diaphragm washer 85-15

and restriction tube 85-11 .

7. Clean out all sediment above or below diaphragm.

8. Replace exhaust valve S85-102 with a new one or

grind disc smooth with fine grinding compound or em-

ery cloth.

9. If restriction pin S85-103 is bent or rusty, it should be

replaced with a new one. The new pin may have to be

filed somewhat smaller in some cases or the pressure

will not equalize in the dome.

10. If valve spring 85-10 is not in good condition, replace

with a new one.

11. Replace diaphragm 85-12, diaphragm washer 85-15

and dome gasket 85-17 with new ones. Gasket 85-17

is important and must be 3/32" thick or it will allow

diaphragm plunger 85-4 to protrude too low and keep

exhaust valve from closing tight against seat.

12. After desired parts have been replaced, reassemble,

being sure everything is air tight. It is easy to have a

small leak in some of the gaskets if not extremely care-

ful.

13. Re-install the accelerator on the dry pipe valve and

reset the valve in accordance to instructions under Re-

setting System in Dry Pipe Bulletin 305 or page 23 of

this data sheet.

Note:The dome gasket 85-17 is to be coated on both

sides with Dow Corning Valve Seal Lubricant, or

equivalent, before assembly.


"Automatic" Accelerator Model 1 - Replacement Parts ListNote: Order Replacement Parts by Part Number

Part Symbol Part Symbol

Number Number Description Number Number Description

8085002 ......... 85-3 .........Bottom Plug 8085009 ......... 85-11 ....... Restriction Tube

8085003 ......... 85-4 .........Diaphragm Plunger 1085012 ......... 85-12 ....... Diaphragm

8085004 ......... 85-5 .........Diaphragm Retaining Ring 8085012 ......... 85-14 ....... Bottom Plug Gasket

8085602 ...... S85-102 .....Exhaust Valve 8085013 ......... 85-15 ....... Diaphragm Washer

8085603 ...... S85-103 .....Restriction Pin 8085014 ......... 85-16 ....... Diaphragm Nut

8085018 ......... 85-9 .........Restriction Pin Screw 8085015 ......... 85-17 ....... Dome Gasket

1085010 ........ 85-10 ........Valve Spring 1420274 ............. - ........... Diaphragm Retaining Ring Screw

16 SVL350

AIR PRESSURE MAINTENANCE DEVICE

Model A-1: 39-760 (1/2" size)

General DescriptionThe air pressure maintenance device is an accessory de-

vice designed to maintain automatically, within predeter-

mined limits, air pressure requirements in a dry pipe sys-

tem. Air passes from the system air supply into the air pres-

sure maintenance device where it is regulated to the air

pressure required for the dry pipe sprinkler system. Small

air losses are restored automatically without delaying sys-

tem operation.

Air pressure maintenance device Model A-1 is listed by

Underwriter’s Laboratories and approved by Factory Mu-

tual.

ComponentsThe air supply line components (shown below and on page

16) are standard on "Automatic" Owner’s Air Supply.

The regulator, item 1, has a maximum primary inlet pres-

sure of 175 psi (1206.6 kPa) and a maximum secondary

outlet pressure of 60 psi (413.7 kPa). It is factory set at 35

psi (241.3 kPa), however, it can be adjusted to suit field

requirements. The outlet pressure of the regulator can be

varied by loosening the locknut (on the regulator) and turn-

ing the adjusting knob clockwise (in) to increase the pres-

sure or counterclockwise (out) to decrease the pressure.

The pressure setting can be determined by reading the

system air pressure gauge.

Air Pressure Maintenance Device

The orifice by-pass globe valve, item 10, is normally closed.

It is opened only to admit air more quickly into the sprin-

kler piping when the dry pipe system is being pressurized

upon completion of installation or when the dry pipe sys-

tem is being reset and system pressure is being restored.

The two isolating valves, items 9, are normally open. They

are closed only to service the air pressure maintenance

device components between them.

The orifice, item 13, restricts the rate of air flow into the

system and prevents the air supply from replenishing a

large volume of air such as would be lost from a fire opened

sprinkler.

The check valve, item 11, prevents system water pressure

from entering the pressure regulator when the system is

tripped.

A strainer, item 12, prevents foreign material in the air sup-

ply from blocking the orifice.

MaintenancePeriodically check the orifice and strainer for blockage.

Verify that the orifice by-pass globe valve is closed and

the isolating valves are open for proper operation of the

device.

SVL350 17

Air Pressure Maintenance Device

Air Pressure Maintenance Device - Replacement Parts ListModel A: 39-760

Item Part Number Description Qty

1............................... 1601385 ................................ 1/4" Regulator ........................................................... 1

2............................... 2034202 ................................ 1/4" x 90° Street Ell - Black ...................................... 2

3............................... 4072401 ................................ 1/4" x 1-1/2" Nipple - Black ....................................... 3

4............................... 4072405 ................................ 1/4" x 3" Nipple - Black ............................................. 1

6............................... 4072020 ................................ 1/2” Close Nipple - Black .......................................... 2

7............................... 2018014 ................................ 1/2" x 1/2" x 1/4" Tee - Black .................................... 2

8............................... 2039204 ................................ 1/2” Union - Black ..................................................... 2

9............................... 5101001 ................................ 1/4" Globe Valve - Brass ........................................... 2

10.............................. 5101002 ................................ 1/2" Globe Valve - Brass ........................................... 1

11 .............................. 5301005 ................................ 1/4" Check Valve - Brass .......................................... 1

12.............................. 2016044 ................................ 1/4" Strainer - Brass ................................................. 1

13.............................. 8039751 ................................ 1/16" Orifice Restriction - Brass ............................... 1

15.............................. 1075690 ................................ Label ......................................................................... 1

18.............................. 4072024 ................................ 1/2” x 2-1/2” Nipple - Black ....................................... 2

19.............................. 2039202 ................................ 1/4” Union - Black ..................................................... 1

18 SVL350

"Automatic" Model GTO Dry Pipe Valve

Velocity Check Valve 39-300

and Replacement Kit 39-310

The main function of the velocity check valve is to prevent

seepage from building up pressure in the intermediate

chamber and to allow the alarm line to drain.

Install with exhaust holes pointing downward into drip cup.

The Velocity Check Valve consists of a hollow cylindrical

chamber with a beveled orifice and a brass ball.

This is screwed into a 1-1/4” tapped outlet on Model GTO

Dry Valves.

Trouble Alarm Silencing Panel

The Trouble Alarm Silencing Panel is used with Model GTO

Dry Valves in conjunction with a Low Air Pressure Switch

and a Horn, Siren or Bell. Its function is to silence the

Trouble Alarm Signal until the cause can be located and

corrected. It can also be used with a monitor switch, a low

liquid level switch or with any electrical detecting device

which will open or close a circuit.

Model 39-740A - Manual Resetting Type:

The Trouble Alarm will sound and the toggle switch will

illuminate when a Low Air Pressure Trouble Alarm Switch

(or other signalling device) closes the circuit due to an

abnormal condition. Throwing the switch to the “Off” posi-

tion silences the alarm. The toggle switch will continue to

illuminate. When the trouble has been corrected, the toggle

switch will cease to illuminate and the alarm will commence

sounding. Throwing the switch to the “On” position (Nor-

mal) will silence the alarm and place the circuit in normal

operating position.

Ordering Information

When ordering, specify: Model 39-740A - Trouble Alarm

Silencing Panel.

SVL350 19

Reference.

NFPA 25, Recommended Practice for the Inspection, Test-

ing and Maintenance of Sprinkler Systems.

TestingBefore proceeding with any tests involving water flow, cer-

tain precautions need to be taken.

1. Check the location where the test connection dis-

charges to make sure that all is clear and that there is

no possibility of the water flow causing damage or in-

jury.

2. Check the end of the test connection to make sure

that is is unobstructed. To obtain a satisfactory test,

there must be an unrestricted flow of water when the

test valve is wide open.

3. Check for alarm connections to a central station or

fire department. If such connections are found, give

proper notice to the signal receiving station before pro-

ceeding with the test.

Testing Waterflow Alarm Devices.

NFPA 25 recommends that the waterflow alarm devices

be tested quarterly.

On a dry system, the primary way to test this equipment is

by opening the Alarm Test Valve provided as part of the

dry valve trim. Using this valve, the alarms may be tested

without tripping the dry valve, since the supply for the alarm

test line is taken from a point below the dry valve clapper

(see Description / Operation).

Waterflow alarms may also be tested by opening the In-

spectors Test Connection.

Caution: Opening the Inspectors Test Connection will

cause the dry valve to trip and thereby allow water to flow

into the system. This means of testing, therefore, should

be used only when a full flow trip test of the dry valve is to

be provided (see Trip Test - Full Flow).

Note: If alarms connect to a central station or fire depart-

ment, notify the signal receiving station when all tests have

been completed.

Testing Low-Air-Pressure Alarm Devices.

NFPA 25 recommends that the low air pressure alarm de-

vices on a dry system be tested quarterly. This can be

accomplished as follows:

1. Close the System Control Valve (OS&Y, PIV or other)

and open the Main Drain Valve.

Note: Relieving the water supply pressure under the

Testing and Maintenance

dry valve clapper will eliminate the possibility of trip-

ping the dry valve.

2. Close the Air Supply Control Valve.

3. While observing the Air Pressure Gage, slowly open

the Condensate Drain Valve to bleed air from the sys-

tem piping. When the low air pressure alarms sound

and/or operate, quickly close the Condensate Drain

Valve. At the same time, note the pressure reading on

the Air Pressure Gage. Record this reading.

4. Open the Air Supply Control Valve and restore the air

pressure on the system to the proper level (see Main-

tenance - Air Pressure for air pressures required for

various water supply pressures).

5. Slowly open the System Control Valve. When water

starts to discharge from the main drain pipe, slowly

close the Main Drain Valve.

6. Turn the System Control Valve to its full open posi-

tion. Seal, lock or otherwise secure the valve in the

open position. The system is now ready for service.

7. If alarms connect to a central station, notify the signal

receiving station when all tests have been completed.

Flow Test at Main Drain Valve (Main Drain Test).

NFPA 25 recommends that a water flow test be made quar-

terly from the main drain valve at the system riser. The

purpose of this test is to show whether or not the normal

water supply is available to the system. By comparing static

and residual pressure readings with those previously estab-

lished, a main drain test can indicate the possible pres-

ence of closed valves or other obstructions in the supply

piping.

The procedure for conducting a Main Drain Test is as fol-

lows:

1. With the Main Drain Valve closed, note and record

the reading on the Water Pressure Gage at the Dry

Valve.

2. Open the Main Drain Valve slowly until it is wide open.

Then, check to make sure that a full steady flow of

water is discharging from the main drain pipe.

Note: If a full steady stream is not discharging, check

the main drain piping further for possible obstructions.

3. Allow the water to flow until the reading on the Water

Pressure Gage drops and stabilizes. Then, record this

reading.

20 SVL350

Note: The first and higher pressure reading is the static

pressure. The second, lower reading is the residual

pressure with a given flow discharging from the main

drain pipe.

4. Close the Main Drain Valve slowly.

Caution: If alarms have been temporarily shut off, they

must be returned to service. If alarms connect to a

central station or fire department, notify the signal re-

ceiving station when the test has been completed.

5. Compare both pressure readings with previously es-

tablished or normal readings.

Note: If the readings compare favorably, the water

supply may be considered satisfactory. If, however,

the pressure readings vary to any great extent, the

condition should be investigated to determine the

cause. Some possible causes are:

• Partially or totally closed system control valves.

• Clogged or frozen water mains.

• Serious leakage at valves or mains.

Trip Testing of Dry Valve.

NFPA 25 recommends that the dry valve be trip tested,

cleaned and reset at least once each year.

The usual procedure is to trip the dry valve with the sys-

tem control valve partially open. But at least once every

three years - or whenever the system is altered - the pro-

cedure is to trip the dry valve with the system control valve

wide open. For discussion, these two test procedures are

designated, respectively, as Trip Test-Partial Flow and Trip

Test-Full Flow.

Note: Dry valves should be trip tested during warm weather,

preferably in the spring, to allow all condensate to drain

from the system piping before the onset of cold weather.

Note: Before proceeding with any trip test of a dry valve,

the water supply line to the system should be thoroughly

flushed. The system main drain may be used for this pur-

pose; however, if there is a hydrant on the supply line, it

should be used to flush the piping before the main drain is

opened.

Note: Assistance is required to perform certain operations

in the test procedures.

Trip Test-Partial Flow. The procedure for conducting a

partial flow trip test is as follows:




2. Allow the water to flow at full pressure long enough to

clear the water supply pipe of any accumulation of

scale or foreign material.

3. Partially close the System Control Valve.

Note: The valve should be kept open just enough to

permit a full flow of water at good pressure through

the main drain pipe.

4. Slowly close the Main Drain Valve. The dry valve is

now ready for trip testing.

5. Note and record the readings on the Air Pressure and

Water Pressure Gages.

Note: Be prepared to again record the reading on the

air pressure gage when the dry valve trips. Also, be

prepared to note the length of time that it takes for the

valve to trip after opening the test valve.

6. While observing the Air Pressure Gage, open the In-

spectors Test Valve.

Note: This valve is part of the Inspectors Test Con-

nection. This connection, generally located at the high-

est and most remote point on the system in relation to

the dry valve, consists of a test orifice and a controlI-

ing globe valve. Opening of the globe valve (Inspec-

tors Test Valve) simulates the operation of a sprinkler.

Note: If two-way communication is not available, open-

ing of the test valve may be determined by noting when

the needle on the air pressure gage starts to move

downward.

7. When the Dry Valve trips, quickly note the tripping time

and the air pressure at the time the valve tripped. Then,

quickly close the System Control Valve and open the

Main Drain Valve.

Note: As a rule, quickly closing the system control

valve and opening the main drain valve keeps the water

from filling the system beyond the riser. It is good prac-

tice, however, to always check the system low points

to make sure that water did not pass beyond the sys-

tem riser.

8. Record the tripping time and the air pressure at the

trip point. Compare all data with previous test records.

Note: If the data differs to any great extent from that

shown in previous records, the cause should be de-

termined and the condition corrected.

9. Thoroughly clean the Dry Valve, renew parts as re-

quired and reset the valve (see Maintenance - Re-

setting the System).

Trip Test-Full Flow. The procedure for conducting a full

flow trip test is as follows:



SVL350 21


2. Allow the water to flow at full pressure long enough to

clear the water supply pipe of any accumulation of

scale or foreign material.

3. Slowly close the Main Drain Valve. The dry valve is

now ready for trip testing.

4. Note and record the readings on the Air Pressure and

Water Pressure Gages.

Note: Be prepared to again record the reading on

the air pressure gage when the dry valve trips. Also,

be prepared to note the length of time that it takes for

the valve to trip and the length of time that it takes for

water to reach the Inspectors Test Connection after

opening the test valve.

5. While observing the Air Pressure Gage, open the In-

spectors Test Valve.

Note: This valve is part of the Inspectors Test

Connection. This connection, generally located at

the highest and most remote point on the system in

relation to the dry valve, consists of a test orifice and

a controlling gate valve. Opening of the globe valve

(Inspectors Test Valve) simulates the operation of a

sprinkler.

Note: If two-way communication is not available,

opening of the test valve may be determined by

noting when the needle on the air pressure gage

starts to move downward.

6. When the Dry Valve trips, quickly note the tripping time

and the air pressure at the time the valve tripped.

7. Allow the water to flow into the system until it reaches

the Inspectors Test Connection. Note the time that it

took for the water to reach the Inspectors Test Con-

nection after the test valve was opened.

8. Keep the Inspectors Test Valve open until clean water

is flowing at the connection. Terminate the test by clos-

ing this valve and the System Control Valve.

9. Record the tripping time and the air pressure at the

trip point. Also, record the time that it took for the wa-

ter to reach the Inspectors Test Connection. Compare

all data with previous test records.

Note: If the data differs to any great extent from that

shown in previous records, the cause should be

determined and the condition corrected.

10. Thoroughly clean the Dry Valve, renew parts as re-

quired and reset the valve (see Maintenance - Re-

setting the System). Make sure that the system is

properly drained before restoring it to service.

Tags / Records.

To comply with NFPA 25, the dry valve should be provided

with an attached tag or card which shows the date when

the valve was last tripped and the name of the person and

organization making the test. Separate records should be

kept which show the test results: initial air and water pres-

sures, tripping time and air pressure when the valve tripped,

and water delivery time to the inspectors test connection.

The operating condition of the dry valve and other compo-

nents should also be noted.

After the test, the records should be compared with those

from previous tests. If any of the data differs to any great

extent, the cause should be determined and the condition

corrected.

MaintenanceThe "Automatic" Model GTO Dry Pipe Valve and its re-

lated equipment should be examined periodically to en-

sure proper operation and trouble-free service. Several ar-

eas to be routinely inspected are:

Clapper Facing. The rubber clapper facing should be

checked for wear or damage, and to determine that it is

free of dirt and other foreign substances. If found to be

worn or damaged (e.g., foreign matter imbedded in the

surface), the facing should be replaced. If it is dirty, it should

be cleaned, but compounds which could damage the rub-

ber facing must never be used.

Seat Rings. Both the air and the water seat rings should

be cleaned thoroughly and checked for possible damage.

If either seat ring is found to be severely damaged, the

complete dry valve assembly should be replaced.

Velocity Check Valve. The plunger should be pushed in

each time the dry valve is inspected to ensure that the ball

is free and that there is no seepage of water that could

build up in the intermediate chamber.

Accelerator. The accelerator should be cleaned and re-

set after each operation of the dry valve. Also, the accel-

erator should be tested at least twice a year. If repairs are

required which cannot be accomplished in the field, the

device should be replaced. For technical information on

the Model 1 Accelerator, see pages 12-15 or Technical Bul-

letin 315.

Antiflooding Device. The float ball and strainer assem-

bly should be removed and cleaned thoroughly.

Alarm Line Strainer. The 3/4" strainer in the alarm line

should be checked and cleaned thoroughly.

Alarm Test Valve, Main Drain Valve, Inspectors Test &

Air Supply Control Valve (Manual Setup). All controlling

valves normally closed when the dry valve is in the set

position should be checked to be sure that they are fully

closed and not leaking.

22 SVL350

System Control Valve, Alarm Control Valve & Air Sup-

ply Control Valve (Automatic Setup). All controlling valves

normally open when the dry valve is in the set position

should be checked to be sure that they are in the fully

open position and sealed, where required.

Dry Valve & Trim. The overall setup should be checked

for visible leaks and possible physical damage to the valve

and connections (e.g., broken gages).

Note: When difficulty in performance is experienced, a

qualified service technician or contractor should be con-

tacted if any field adjustment or repair is attempted.

Air Maintenance Device or Automatic Control Con-

nections. Strainers and restriction orifices should be

checked and cleaned as required. The orifice by-pass valve

should be checked to see that it is fully closed.

Air Compressor. The air compressor should be lubricated

as recommended by the manufacturer. The motor unit

should be kept free of dirt. Filters and strainers should be

cleaned as required.

Air Pressure. Air or nitrogen pressure must be maintained

on the dry system throughout the year.

Note: Dry systems should not be converted to wet sys-

tems during warm weather. To do so will cause corrosion

and accumulation of foreign matter in the system piping.

Also, when a dry system is turned wet, it is necessary to

silence the waterflow alarm. A sprinkler system should

never be without a waterflow alarm.

The table below shows the air pressure required on the

dry system for various water supply pressures.

Water Supply System

Pressure Air Pressure (psi)

(psi)* Minimum Maximum

50 15† 25

75 20† 30

100 25 35

125 30 45

150 35 50

175 40 50

* The water supply pressure is the highest antici-

pated static pressure. If a fire pump is provided, it

is the pump shutoff pressure or relief valve pres-

sure, whichever is greater.

† When an accelerator is installed with the dry valve,

a minimum system air pressure of 25 psi is re-

quired.

For systems with manual control connections, the air or

nitrogen pressure should be checked at least once a week.

When the pressure is low, it should be restored to the

proper level promptly. If the pressure loss each week is

greater than the 10 psi (69 kPa), the system should be

checked for leaks. Excessive leaks should be promptly

repaired.

For systems with automatic control connection (air com-

pressor or air maintenance device), the pressure should

be checked at regular intervals to see that the equipment

is functioning properly and that the required pressure is

being maintained. According to NFPA 13, the permitted

rate of air leakage is 1.5 psi (10 kPa) for a 24 hour period.

Low-air pressure alarms should be tested quarterly (see

Testing Low-Air-Pressure Alarm Devices). The switch

should be checked to see that it is properly set to operate

at 5 psi (34 kPa) below the required system pressure.

Priming Water Level. The priming water in the dry valve

should be inspected quarterly and maintained at the proper

level. Loss of water either through evaporation into the

system or by seepage past the air seat ring could result in

false operation of the valve. On the other hand, accumu-

lation of additional water from condensation in the system

can slow down the operation of the valve.

To check the priming water, slowly open the Condensate

Drain Valve. If water discharges into the Drain Cup, the

priming water level is too high and it must be allowed to

drain away. Let the water continue to drain, but slowly.

Quickly close the Condensate Drain Valve when the water

stops flowing.

If air discharges when the Condensate Drain Valve is

opened, quickly close the valve. The priming water level

may be too low. To add priming water, proceed as follows:

1. Close the System Control Valve and open the Main

Drain Valve. If the system has automatic air, close the

Air Supply Control Valve. If there is an accelerator,

close the Accelerator Control Valve.

2. Open the Condensate Drain Valve and the Priming

Cup Valve to bleed off the system air pressure.

3. Refer to Resetting the System. Prime the dry valve

per steps 10 thru 12, then repressurize the system

and restore it to service in accordance with step 14

and steps 17 thru 21, where applicabie. Also comply

with steps 24 and 25.

4. Open the Accelerator Control Valve (if the system is

so equipped and this valve has been closed).

Valve Enclosure. The temperature in the enclosure around

the dry valve should be maintained at a temperature above

40° F (4°C).

System Low Points. Low points on the dry system should

be drained as often as required to remove any water that

has accumulated - especially before and during cold

weather. The process should be repeated daily until all

SVL350 23

water is removed. Freezing of even a small amount of water

can rupture sprinkler piping, thereby impairing the system

and causing extensive water damage to the building and

contents.

Resetting of System

After operation, the "Automatic" Model GTO Dry Pipe Valve

must be reset and the system restored to service as soon

as possible.

1. Close the System Control Valve (OS&Y, PIV or other).

Caution: In the event of a fire, the system control valve

is to be closed only after it has been determined, posi-

tively, that the fire has been extinguished.

2. Close the Air Supply Control Valve.

3. Open the Main Drain Valve and allow the system to

drain completely. Leave the valve open.

Note: If sprinklers have not operated, another means

of venting the piping is required to properly drain the

system. This can be accomplished by opening the

Inspectors Test Connection.

4. Open the Auxiliary Drain Valves (or Outlets) at system

low points and drain completely.

5. At the Dry Valve, push in the plunger on the Velocity

Check Valve. Release it when water stops discharg-

ing.

6. Remove the Handhole Cover from the Dry Valve and

raise the Clapper to a wide open position.

7. Thoroughly clean all interior parts of the valve. Check

them for freedom of movement. Carefully inspect the

Clapper Facing and Seat Rings for damage.

Caution: Never use compounds or abrasives on the

clapper facing or seat rings. Use bare fingers or cloth

to remove grit deposits. Do not scar the seat ring

surfaces.

8. Release the Clapper latch and lower the Clapper to

the Seat Rings.

Caution: Never use grease or other sealing material

on the seat rings. Do not use force on the clapper in

attempting to make the dry valve tight.

9. Replace the Handhole Cover and Gasket, tightening

the Cover Bolts (Cap Screws) evenly and securely.

10. Open the Priming Cup Valve, while making sure that

the Condensate Drain Valve is closed. Prime the Dry

Valve by slowly pouring water into the Priming Cup.

Stop pouring when water remains in the cup.

Note: To add priming water to the valve, the system

piping must be open to atmosphere - for example,

through an opened sprinkler or an open Inspectors

Test Connection.

11. Open the Condensate Drain Valve and remove excess

priming water from the Dry Valve. Close the Conden-

sate Drain Valve.

12. Check the Velocity Check Valve for leakage. If there

is none, proceed with resetting the Dry Valve.

Note: Priming water must be retained in the valve

before the system can be restored to service. If

leakage is observed at the velocity check valve, the

dry valve must be reopened and reinspected. Re-

place the clapper facing if it is worn.

13. Replace the sprinklers which have operated and make

sure all auxiliary drains are closed.

14. Close the Inspectors Test Connection - if it has been

opened to trip or vent the system.

15. Reset the Accelerator - if the system is so equipped

(see Cleaning / Resetting of Accelerator in "Automatic"

Data Book or Technical Bulletin 301).

Note: Cleaning and resetting of the accelerator may

proceed concurrent with re-establishing the air sup-

ply on the system (Steps 16 thru 18 which follow).

16. Open the Air Supply Control Valve and admit air to the

system.

Note: It is good practice to build up the air pressure

to about 10 psi, then individually open the auxiliary

drains to force any remaining water from the system’s

low points. When dry air starts to discharge, close

the valve or outlet. Be sure to replace the plugs in all

drain valves.

17. Admit air to the system until the Air Pressure Gage

registers the required pressure - that is, until there is

sufficient air pressure to hold the Dry Valve closed

against the water supply pressure (see Maintenance

- Air Pressure for air pressures required for various

water supply pressures).

18. Again, check the Velocity Check Valve for leakage. If

there is none, proceed with resetting the system.

Note: If the Clapper Facing is tight on the Air Seat

Ring, the valve will be holding its priming water and

no leakage will be found. If leakage is observed,

however, the dry valve must be reopened and rein-

spected. Priming water must be retained in the valve

before the system can be restored to service.

24 SVL350

19. Slowly open the System Control Valve. When water

starts to discharge from the main drain pipe, slowly

close the Main Drain Valve.

20. Turn the System Control Valve to its full open posi-

tion.

21. Open the Alarm Control Valve - if it has been closed to

silence alarms. Reset the Trouble Alarm Silencing

Panel - if there are low-air-pressure alarms and they

have been silenced.

22. Conduct a Main Drain Test to make sure the water

supply is satisfactory (see Flow Test at Main Drain

Valve).

23. Conduct a test of the alarm devices (see Testing

Waterflow Alarm Devices).

24. Seal, lock or otherwise secure the System Control

Valve and Alarm Control Valve in an open position (per

NFPA 25). The system is now ready for service.

25. If alarms connect to a central station or fire depart-

ment, notify the signal receiving station that the sys-

tem has been returned to service.

24 SVL300

SVL350 25

"Automatic" Sprinkler

150 Gordon Drive • Exton, PA 19341 USA

Tel: (610) 363-1400 • 800-626-2682

Fax: (610) 524-9073 • 800-858-6857

This information is only a general guideline. The company reserves the right to change any portion of this information without notice. Terms and

conditions of sale apply and are available on request.

5/02 Printed in USA (SLV350.PMD)

svl350-model gto dry pipe valves - kidde gto.pdf · nitrogen source, or from a manually operated...

Documents