Oilgear Pump Controls

Oilgear

Pump Controls

PVWJ, PVG, and PVV

Innovative Fluid Power

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.


OP-2

4- way Control Circuit


4- way Pressure vs Volume


PVWJ Controls


3-way Style Controls

PVWJ

• 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

Access for lifting eye

Pressure adj. Screw

RP Port


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

P-1NN or P-LNN


Full Stroke

Optional Minimum Volume Stop

Pressure Compensator Adjustment

Spool Drain

Plug 361

Maximum Volume Stop


Zero “Slip Stroke”

Optional Minimum Volume Stop

Pressure Compensator Adjustment

Spool Drain

Plug 361

Maximum Volume Stop


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-LNN

Control Stability Orifice

Compensator spool


P-1NN or P-LNN Port Locations

Compensator Inlet

Compensator Spool Drain

Control Spring Drain

Compensator 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





– Dual compensator springs



• Dual Compensator

Springs


P-1NN or P-LNN

New Spring Seat

New Dampened

Compensator Spool

Dual Compensator Springs






– 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

Spring Seat and O-ring Seal

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


PVWH vs. PVWJ

PVWJ

PVWH






– 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 oring to seal the case.

• The compensator inlet oring 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


Load Sense Port

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

RP1 Port

Max. Volume Stop


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


P-1NN/FNN

What’s Missing?

Compensator Inlet



P-1NN/FNN


Besides the control piston!

Compensator Inlet



P-1NN/FNN


Compensator Inlet


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 D

P 170 psi

– J = Adjustable D

P

100-220 psi

– K = Adjustable D

P

225-350 psi

Fixed module is shown


Note:

The restriction device and load sense line are customer supplied.

P-1NN/FNN Diagram

RP Port

Port RP

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

.030” orifice

System Header

Remote Relief Valve

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 D

P across a customer supplied restriction, i.e. flow control, proportional valve, etc.


3000 psi

34 gpm

1500 psi

15 gpm

34 gpm

HP Required @ 34 GPM = 35.00

HP Required @ 15 GPM = 70.00

Why is the horsepower double @ 15 GPM

2 Speed Motor Circuit - Fixed Volume


3200 psi

34 gpm

1500 psi

34 gpm

15 gpm

HP Required @ 34 GPM = 35.00 hp


HP Saving Over Fixed Pump @ 15 GPM = 39.00 hp

2 Speed Motor Circuit - Pressure

Compensated


34 gpm

3200 psi

15 gpm

1670 PSI

3000 psi

L

P 170

.020 Bleed Orifice

2 Speed Motor Circuit -

Load Sense

1500 psi

1500 psi Working

Pressure

HP



HP Savings L.S. vs. Fixed = 52.00 hp

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


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-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



• Pumps that use a 4-way style control




– PVG




– 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.


GPA

P-1NN Compensator

OP3

OP14

OP2

Remote Port 1

OP4

OP6


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 ”


OP-2

OP-3

OP-4

OP-10

OP-5

Orifice Locations

OP-6

OP-14

OP-1


OP 1

OP 14


Remote Compensating a Single PVG


P-1NN/F Load Sense Control

Customer Supplied

OP14

OP2


Remote Compensating Multiple

4 way Style Pump Controls

To System


P-1NN/F Load Sense Control


P-1NN/F Load Sense Plus

GPA

LS

A

Customer

Supplied

OP1

OP15

OP2

RP1 OP8

OP3 OP4

OP6

B


Compensator

Adjustment

Stand-by

Adjustment

Delta P

Adjustment


P-2NN Dual Pressure Control


P-2NN Compensator - Full Stroke

High Pressure

Adjustment

Solenoid Selector

Low Pressure

Adjustment


P-C NN Soft Start Control


Unloading

Solenoid

Valve


Thank you for buying Oilgear

Products


Oilgear Pump Controls

Oilgear

Pump Controls

PVWJ Controls

P-LNN

P-1NN and P-LNN

P-1NN or P-LNN Port Locations

Changes in the Control

PVWJ Control Changes

Changes in the Control

PVWJ Control Changes

P-1NN or P-LNN

Changes in the Control

PVWJ Control Changes

PVWH vs. PVWJ

Changes in the Control

PVWJ

PVWJ Control Orifices

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

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

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

P-1NN/FNN

P-1NN/FNN

P-1NN/FNN

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

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

P-1NN/F

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

PVG/PVV Controls

Remote Compensating Multiple

4 way Style Pump Controls

Thank you for buying Oilgear

Products

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P-C or P-K Soft Start

P-C or P-K Soft Start