Hydraulic safety group PTFE

• Safety group « medium/high end position ».• Valve seat with PTFE coating contributing to limit the risks of scaling.• Recommended whenever water is loaded with scale.• For hot water storage heaters up to 10 kW maximum useful power.• SFR PTFE is EN 1487 approved by NF (CSTB) and BELGAQUA.

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SFR PTFE is positioned between the standard group SFR and high-endSFR stainless steel . The PTFE seat contributes to limit the risks of scaling which can harm thesealing of the valve. SFR PTFE is particularly recommended in the cases of calcareous water.

Advantages :1. Fast filling rate of more than 4000 L/h under 1 bar.2. Less head loss, greater convenience for users.3. Valve knob designed for excellent grip.4. New valve seat limits risk of leaks by efficient clearance of foreign matter.5. Dimensions make the group interchangeable with the major safety groups onthe market.

6. Swivelling air gap designed to protect the wall from water splashes regardlessof the type of mounting.

7. For water tanks up to 10 kW maximum useful power.

HYDRAULIC SAFETY GROUP PTFE • SFR PTFE

Female port, Ø 3/4“ 20x27 for mounting on the water heater with a Dielectric Insulating Connection (WATTS INDUSTRIES “RID”).

Check valve inspection port.

Check valve : built into safety group to allow intake of cold water into hot water system and stop return of hot water into the mains.

Quarter-turn isolating ball valve.

Conception❶

❹

❷

❸

Expansion relief valve : limits pressure in the

water heater. Set to 7 bar.

Instant opening, "POP" effect,guarantees very high

outflow rate.

Water guide : nozzle profile prevents any risk of splashing.

Safety valve discharge port with air gap.

1” thread (26 x 34).

❺

❼

❻

New safety group with ball valvePolished brass ball ➜ less subject to scale than chromed ball

Dimensions compatible with curved-bottom tanks

New valve seat : for easier clearance of foreign matter below the valve diaphragm.

Flat-face cold water connection G3/4”, is also specifically machined (cop-per pipe up to 16/18) for quick connection fittings (“GRIPP” type or other).

Curved-bottomtanks

Water heater supply F 3/4"

Calibrating spring 7 bar

Safety valve plate

Return spring

Non-return valve unit

Obturator of hydraulic valve design generating the minimum of pressure losses

Lip seal guaranteeing a very good tightness in high or low pressure

PTFE coating of the insulating tap

Cold water inlet M 3/4"

Valve knob

Sticker :green = SFR PTFE

Ball of the insulating tap with ball valve

Brass body

Integrated air gap

Elastomer membrane

Safety valve shaft

Profiled water guide for drop by drop andto avoid the splashes

Discharge connection M 1" with trap funnel kit

PTFE valve seat

Sticker :

green = PTFE

❹ ❷

❶

❸

❺

❻ ❼

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HYDRAULIC SAFETY GROUP PTFE • SFR PTFE

Typical installation

Dielectricinsulatingconnection

Hot water

Mixed water

Cold water inlet

PressurereducingvalveREDUFIX

Safety Group

DeflectorDrainage

Trap funnel kit

ThermostaticMixing valvesMMV-C

Electrical hot waterstorage heater

Dielectricinsulatingconnection

Hot water

Mixed water

Cold water inlet

PressurereducingvalveREDUFIX

Safety Group

Expansion vessel�

FlexibleTee

Mur

al s

uppo

rt

DeflectorDrainage

Trap funnel kit

ThermostaticMixing valvesMMV-C

Electrical hot waterstorage heater

B : with sanitaryexpansion vessel.A : without sanitary expansion vessel.

Dimensions (in mm)

Flow rate (l/min.)

Pres

sure

(b

ar)

Pressure drop curve / headloss

Name MaterialMachined body Brass CW617NBall-valve seal VIRGIN PTFEValve diaphragm EPDM 70ShValve knob PA 6Valve seat Brass with PTFE coating

Name MaterialAir gap PA 6.6 30% GFValve ball Brass CW614NDrain plug POMCheck valve TR20 Grivory HTVWeight 0,360 kg

Recommendation / Installation

Water heater working normallyThe stop valve is in the “open” position and the valve is in the“on” position under normal working.During heating, pressure rises inside the water heater and thenonreturn valve closes. When the pressure reaches 7 bar, the safety valve opens slight-ly and allows some water to escape and this occurs intermittent-ly throughout the heating time.Exhausting water like this is normal ; it proves that the SafetyGroup is working correctly. There is no need for troubleshooting and remedies.

Water heater working abnormally The water heaters thermostat can malfunction and fail to cut offthe heat source.This causes pressure and temperature to rise which lifts thevalve in the safety group allowing steam to escape with a cha-racteristic whistle.You should cut off the water heater power source immediatelyand contact the installer who will change the thermostat. The safety group should be replaced: the temperature of steamat 7 bar is 165°C and could damage the valve seals.

FrostIf you are using your water heater when there is a risk of frost, itis recommended that you empty it: turn off the power source,close the Safety Group stop valve, open one of the hot watertaps of the system and open the drain valve.

ImpuritiesIf the Safety Group keeps on emptying itself, the drain valveshould be opened several times to blow off the impurities bloc-king the seal.

MaintenanceIf properly fitted, the safety group needs no maintenance.However, we recommend that the drain valve be opened at leastonce a month.

Recommendations / Installation1 - Make sure there is no seal mastic, oakum or other waste pre-

venting its proper working.2 - Operate the isolating valve and safety valve at least once a

month.3 - The drain pipe should be 25 mm minimum. A suitable tundi-

sh/airgap (not supplied) should be fitted. 4 - If the cold water supply pressure exceeds 3 bar, a pressure

reducing valve should be fitted UPSTREAM of the safetygroup. Please refer to the range available from WattsIndustries.

5 - This Safety Group may be fitted to a water heater of maxi-mum 10 kW working power.

6 - Subject to plumbing regulations.7 - To prevent the two metal corrosion phenomenon, fitting Di-

electric Unions on piping between the water heater and thesafety group as well as the water heater hot water outlet isrecommended. Please refer to the range available fromWatts Industries.

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WATTS INDUSTRIES France

06, avenue Gustave Eiffel - B.P. 40339 - 28006 CHARTRES Cedex (France)

Phone +33 (0)2 37 25 11 00 - Fax +33 (0)2 37 25 11 11

E-mail info@wattsindustries.fr - Site www.wattsindustries.com

Product range Watts Industries

- System disconnectors- Backflow protection devices- Check valves- Safety groups- Safety relief valves- Pressure reducing valves- Automatic control valves- Butterfly valves- Shut off valves- Measuring gauges

- Temperature control- Expansion vessels- Process switches- Fuel products- Gas products- Electronic controls- Installation protection products- Radiator valves- System products- Manifolds and fittings

Re-order no. 53(9)-UK-09/05

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