oilgear pump controls

Innovative Fluid Power

OilgearPump Controls

PVWJ, PVG, and PVVPVWJ, PVG, and PVV


Pump Controls

• 3-way Style (PVWW/PVWJ)– Typically used in circuits where fast response

times are not necessary.


3- way Control Circuit


3- way Pressure vs Volume


Pump Controls

• 3-way Style (PVWW, PVWJ)– Typically used in circuits where fast response

times are not necessary.

• 4-way Style (PVG, PVV)– Typically used in circuits where fast response is

critical.


4- way Control Circuit

OP-2


4- way Pressure vs Volume


PVWJ Controls


3-way Style ControlsPVWJ

• P-1NN, P-LNN Single Pressure Compensator

• P-1NN/F Load Sense Compensator (PVWJ)

• P-CNN, P-KNN Soft start Compensator

• HP Horsepower Limiter

• G Horsepower limiter with load sense


PVWJ P-1NN Control

RP Port

Access for lifting eye

Pressure adj. Screw


3-Way - P-1NN or P-LNN

CN ControlCN Control

P-1NN or P-LNN


Full Stroke

Spool Drain

Pressure Compensator Adjustment

Optional Minimum Volume Stop

Plug 361

Maximum Volume Stop


Zero “Slip Stroke”

Optional Minimum Volume Stop

Pressure Compensator Adjustment

Spool Drain

Maximum Volume Stop

Plug 361


P-LNN

• We offer a low pressure version of the PVWJ pump. The designator for this control is P-LNN. This control will allow the pump to go to a minimum compensator setting of approximately 150 psi. The pumps maximum pressure limit is 1500 psi.


P-1NN and P-LNNControl Stability Orifice

Compensator spool


P-1NN or P-LNN Port Locations

Compensator Inlet

Compensator Spool Drain

Compensator Spring Drain

Control Spring Drain


Changes in the Control

• The PVWJ-P-1 pressure compensating control is functionally the same as the previous PVWH-CN control with improvements to the control to; increase stability, reduce control generated noise, and ease of field adjustment. Some of these changes are:– New dampened compensator spool


PVWJ Control Changes

• New Compensator Spool

PVWJ

PVWH



• The PVWJ-P-1 pressure compensating control is functionally the same as the previous PVWH-CN control with improvements to the control to; increase stability, reduce control generated noise, and ease of field adjustment. Some of these changes are: – New dampened compensator spool

– Dual compensator springs



• Dual Compensator Springs


P-1NN or P-LNN

New Dampened Compensator Spool

Dual Compensator SpringsNew Spring Seat





– New compensator adjustment assembly



• New Adjustment Assembly

• Shims are now used to increase the maximum pressure, instead of reducing pressure as in the PVWH series

The screw that holds the adjustment shims, screws in to the pressure adjusting screw.

Spring Seat and O-ring Seal


PVWH vs. PVWJ

PVWHPVWJ





– New compensator adjustment assembly

– New control housing

– NO GASKETS!!


PVWJ

• As you can see in the photo on the right, the pump housing has been machined to accept an o-ring to seal the case.

• The compensator inlet o-ring has been relocated to pump housing


PVWJ Control Orifices

• Standard Control Stability Orifice Sizes– PVWJ-011/014/022 .040” (1,016

mm)– PVWJ-025/034/046 .040” (1,016

mm)– PVWJ-064/076/098/130 .050” (1,27 mm)

• All standard orifices are drilled 10-24 X ¼” hollow hex set screws.


Control Piston Orifice


P-1NN/F, and P-LNN/F


P-1NN/F, and P-LNN/F

RP1 Port

Max. Volume Stop

Load Sense Port


P-1NN/FNN, or P-LNN/FNN


P-1NN/FNN

Compensator InletCompensator Spring Drain

What’s Missing?


P-1NN/FNN


What’s Missing?Besides the control piston!


P-1NN/FNN


What’s Missing?

The spool drain!


P-1NN/F and P-LNN/F

• In all P-1NN/F, P-LNN/F, P-C**, and P-K** controls the spool drains are not drilled.

P-1NN

P-1NN/F


P-1NN/FNN vs P-1NN/FSN

• The pictures to the right show an “A” frame PVWJ without a maximum volume stop, and a P-1NN/FSN control with a maximum stop.

• Unlike the PVWH, the PVWJ incorporates a transition block which allows the LS module to be rotated 90° to facilitate a maximum stop. This eliminates the need to relocate the module to the top of the control housing.

Adjustable LS Option

Fixed LS Option


P-1NN/F

• Options for the PVWJ load sense modules:– F = Fixed P 170 psi

– J = Adjustable P 100-220 psi

– K = Adjustable P 225-350 psi

Fixed module is shown

Innovative Fluid PowerInnovative Fluid Power

P-1NN/FNN Diagram

Note:

The restrictiondevice and loadsense line are

customersupplied.

RP Port

Port RP


System Header

Remote Relief Valve

.030” orifice

PVWJ Pumps w/P-1NN/F-ADJ* Control

Remote Compensating PVWJ Pumps using Adjustable Load Sense Controls


Load Sense Control

• Primarily used on mobile equipment to help minimize wasted horsepower.– Allows the pump maintain a constant flow

regardless of pressure, within ± 5%.– Helps minimize heat generated in the system.

• By maintaining a constant P across a customer supplied restriction, i.e. flow control, proportional valve, etc.


2 Speed Motor Circuit - Fixed Volume

HP Required @ 34 GPM = 35.00

HP Required @ 15 GPM = 70.00

Why is the horsepower double @ 15 GPM

15 gpm

34 gpm

1500 psi

34 gpm

3000 psi


34 GPM

2 Speed Motor Circuit - Pressure Compensated

34 gpm

15 gpm

34 gpm

1500 psi

3000 psi

HP Required @ 34 GPM = 35.00 hp

HP Required @ 15 GPM = 31.00 hp

HP Saving Over Fixed Pump @ 15 GPM = 39.00 hp

3200 psi


1500 psi Working Pressure

1670 PSI

HP

2 Speed Motor Circuit - Load Sense

HP Required @ 34 GPM = 35.00 hpHP Required @ 15 GPM = 18.00 hp

HP Savings L.S. vs. Fixed = 52.00 hp HP Savings L.S. vs. P Comp. = 14.00 hp

.020 Bleed Orifice

3200 psi

3000 psi

P 170

15 gpm

34 gpm

1500 psi


Why Use a Load Sense over a Pressure Compensated Control?

• Cost

• Stability

• Ability to remote compensate more than a single pump.


P-C** or P-K** Soft Start


P-K**


P-K**

Why is this control a P-K**?


P-K**

Why is this control a P-K**?

N.C. Two-Way Valve


PVG/PVV Controls


4-way Style Controls

• Pumps that use a 4-way style control



• Pumps that use a 4-way style control– PVG



• Pumps that use a 4-way style control– PVG– PVV



• P-1NN Single Pressure Compensator

• P-2NN Dual Pressure Compensator

• P-A** N.O Proportional Pressure Compensator

• P-B** N.C. Proportional pressure Compensator

• P-C** Single Pressure w/ No Load Starting



• P-1NN/F Single Pressure w/ Load Sense

• P-1NN/H Single Pressure w/ Horsepower Limiting

• P-1NN/G Single Pressure w/ HP Limiting & Load Sense

• P-1NN/K Single Pressure w/ Load Sense Plus


P-1NN 4-way Pressure Control

• Features included in these style of controls

– Easily Remotely Compensated– Critical Orifice Ports tapped for orifice plugs.


P-1NN Compensator

OP2

OP14

OP6

OP3 OP4GPARemote Port 1


P-1NN 4-way Pressure Control

• Typically this control is used where very fast response is required.– Response times of 45-55 milliseconds (PVG)

• Set works in sawmills


Full Stroke


Compensated “Slip Stroke”


Orifice Locations

OP-10

OP-4

OP-3

OP-2

OP-14

OP-1

OP-6

OP-5


OP 1

OP 14


Remote Compensating a Single PVG


P-1NN/F Load Sense Control

OP2

OP14

Customer Supplied


Remote Compensating Multiple 4 way Style Pump Controls

To System


P-1NN/F Load Sense Control


P-1NN/F Load Sense Plus

OP3 OP4OP2

RP1

OP1

A

B

GPA

OP6

OP8

OP15

LS

Customer Supplied


Delta P Adjustment

Stand-by Adjustment

Compensator Adjustment


P-2NN Dual Pressure Control


P-2NN Compensator - Full Stroke

Low Pressure Adjustment

High Pressure Adjustment

Solenoid Selector


P-C NN Soft Start Control


Unloading Solenoid

Valve


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