For PVWW, PVWH, PVG, PVK, PVV, and PVM Oilgear Pump Controls For PVWW, PVWH, PVG, PVK, PVV, and PVM

Oilgear Pump Controls 3-way Style (PVWH) Typically used in circuits where fast response times are not necessary.

Oilgear Pump Controls 3-way Style (PVWH) 4-way Style (PVG, PVK, PVV) Typically used in circuits where fast response times are not necessary. 4-way Style (PVG, PVK, PVV) Typically used in circuits where fast response is critical.

Oilgear Pump Controls 3-way Style (PVWH) 4-way Style (PVG, PVK, PVV) Typically used in circuits where fast response times are not necessary. 4-way Style (PVG, PVK, PVV) Typically used in circuits where fast response is critical. Meter-Out Style (PVM) Typically used in circuits that require quick response to small load changes.

3-way Style Controls CN & CL Single Pressure Compensator C2 Dual Pressure Compensator CF Load Sense Compensator HP Horsepower Limiter ER Electronic Remote CU Soft Start Compensator

CN & CL Control

PVWH 3-Way CN Control CN Control CN Control

CN & CL Control Control Spring Control Piston Control Orifice (10-24 x .250) Pressure Adjusting Screw Pressure Comp. Assembly Compensator Spring & Spool

CN & CL Control Compensated

3-way CN and CL Control What is a CL Control? A low pressure version of a“CN” control. The compensator and control springs have reduced “K” factors. This reduces the allowable minimum compensator setting to approximately 150 psi, and a maximum pressure setting of 1500 psi. The compensator adjustment is shimmed to limit the maximum output pressure.

CL Control Control Spring Pressure Adjusting Screw Additional Shims Pressure Comp. Assembly Compensator Spring

CN & CL Control Diagram 3 2 1

CN Control Features Simplistic Design

CN Control Features Simplistic Design Hardened Control Housing Hardened Housing

CN Control Features Simplistic Design Hardened Control Housing Available w/ Maximum and Minimum Volume Stops Min Volume Stop Max Volume Stop

CN Control Features Simplistic Design Hardened Control Housing Available w/ Maximum and Minimum Volume Stops Internal Tapped Porting Allows control to be tuned to the system

Control Piston Orifice CN Control Features Internal Tapped Porting Allows control to be tuned to the system Control Piston Orifice Spool Drain Inlet Port

CU Soft Start Control

CU Soft-Start Control Typically used on engine driven units, but can be used on electric motor driven units. Allows the pump to compensate at low pressure while engaging an engine’s starter motor. This is achieved by using a solenoid valve in parallel with the compensator spool. This control is not designed to unload the system.

CU Soft Start Control CU Soft Start - N.C. CU Control - N.C.

Compensator Adjustment Assembly CU Soft Start - NC Control Orifice Control Spring Control Piston Compensator Spool Unloading Valve Pressure Adjustment Compensator Spring Compensator Adjustment Assembly

CU Control - Unloaded Note: When the solenoid is energized, pressure by-passes the compensator spool,

CU Control Diagram

CF Load Sense Control

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

Customer Supplied Restriction CF Load Sense Control Customer Supplied Restriction CF Control CF Load Sense Control

2 Speed Motor Circuit - Fixed Volume 1500 PSI 34 GPM 15 GPM 3000 PSI HP Required @ 34 GPM = 35.01 HP Required @ 15 GPM = 70.01 34 GPM Why is the horsepower double @ 15 GPM?

Variable Volume - Pressure Compensated 34 GPM 15 GPM 3200 PSI HP Required @ 34 GPM = 35.01 HP HP Required @ 15 GPM = 30.89 HP 3000 PSI HP Savings @ 15 GPM = 39.12 HP

Variable Volume - Load Sensed 1500 psi Working Pressure 34 GPM 1670 PSI 15 GPM HP Required @ 34 GPM = 35.01 HP 3200 psi HP Required @ 15 GPM = 17.91 HP HP Savings L.S. vs. Fixed = 52.10 HP HP Savings L.S. vs.. P Comp = 12.98 HP Delta P 170 3000 PSI

CF Control Load Sense Spring Shims Load Sense Spring + Shims =Delta P Control Spring = Stand-By Pressure Load Sense Module Load Sense Spool

CF Control Metered

CF Control Diagram

C2 Dual Pressure Compensator

C2 Dual Pressure Control Typically used in circuits requiring two pressures, or in circuits which require a low pressure stand-by, and a high working pressure.

C2 Dual Pressure Control C2 Control

C2 Control Diagram

ER Proportional Pressure Compensator

ER Electronic Pressure Control Typically used in circuits requiring multiple pressure settings (more than three), i.e. press circuits.

ER Electronic Pressure Control Typically used in circuits requiring multiple pressure settings (more than three), i.e. press circuits. This control will produce very precise pressure control when, the loop is closed electronically with a pressure transducer .

ER Electronic Pressure Control When electronically tied in with a position feedback device, i.e. a Temposonic probe or absolute encoder, position control of a machine can be achieved.

ER Proportional Pressure Control ER Control

ER Control Diagram

HP Limiter

HP Limiting Control This control is typically used in applications that have very limited available horsepower, but require high volume at low pressure and low volume at high pressure, or on engine driven units.

HP Limiting Control There are some things to keep in mind when selecting a horsepower limiting control. 1. What is the minimum HP limiter available for that size pump? A good rule of thumb is one third of the maximum horsepower rating of the pump. 2. What rpm will the pump be driven at? All of Oilgear’s, PVWH, PVG and PVK-140 horsepower controls are calculated at 1800 rpm.

HP Limiting Control 2. What rpm will the pump be driven at? All of Oilgear’s, PVWH, PVG and PVK-140 horsepower controls are calculated at 1800 rpm. Example: PVWH-34 w/ 40hp limiter @ 2400 rpm 2400/1800=1.33 so 40hp/1.33= 30hp A 30hp @ 1800 rpm limiter will actually be 40hp @ 2400 rpm

HP Limiting Control 3. To low of a horsepower setting may not allow you to get to the desired high pressure. What is horsepower? HP limiting controls are inherently inefficient due to high leakage rates in the control. This adds parasitic horsepower loss through the control.

HP Limiter HP Spool HP Control Piston HP Stop Bar HP Springs

HP Limiter Spool On Stroke Balanced Position Off Stroke

HP Limiter Curves

CH Hi-LO Compensator

CH Hi-LO Control This control is typically called, “The poor man’s horsepower limiting control”. The control will give the customer high flow at low pressure, and low flow at high pressure, but at a cost.( See nothing is free in this world)

CH Hi-Lo Control In order to achieve low flow at high pressure, a minimum volume stop is used. The high pressure control now becomes a relief valve, because if the minimum volume stop is set for something greater than 0 volume (slip stroke), the pump becomes a fixed displacement pump at that volume and pressure will go to relief valve setting.

CH Hi-Lo Control What if a customer’s application requires high volume at low pressure, and low volume at high pressure, and he only has a 10hp electric motor.

Break Point Adjustment: 428.5 psi CH Hi-Lo Compensator Minimum Volume Stop Control Piston Break Point Adjustment: 428.5 psi Compensator Spool

CH Hi-LO Compensated When using a minimum volume stop, a relief valve MUST be used! Minimum Volume Stop set at 4.16 gpm

CH Hi-Lo Control

Non-Compensated Controls for PVWH Pumps HN Handwheel Control MN-MS Manual Pintle Control V-M Servo Control

HN Hand Wheel Control

HN Hand Wheel Control

HN Handwheel Control This control is typically used in applications where the application does not need pressure compensation but does require variable output volume.

MN / MS Pintle Control

MN/MS Pintle Control This control is an over-center volume control and is typically found on hydrostatic transmissions.

MN/MS Pintle Control This control is an over-center volume control and is typically found on hydrostatic transmissions. With the use of a minimum volume stop it can be used on an open loop pump.

MN/MS Pintle Control This control is an over-center volume control and is typically found on hydrostatic transmissions. With the use of a minimum volume stop it can be used on an open loop pump. The control requires a customer supplied lever operator, or some type of mechanical device to stroke the pump.

MN / MS Pintle Control

V-M Electronic Servo Control

V-S/V-M Servo Control V-S Servo Valve Operator with a High Pressure L.V.D.T. feedback device. V-M Servo Proportional Valve Operator with a High Pressure L.V.D. T. feedback device. These controls are typically in circuits where the customer has a lot of money.

VS/VM Servo Control All kidding aside, these control are used on applications that require very accurate control of volume. There few functions, that we can not do with a servo controlled pump, that we can do with the controls we talked about already.

V-S/V-M Servo Control We can do: flow control (HN, MN/MS) load sensing (CF) pressure limiting (CN, C2, CU) horsepower limiting (HP) current limiting It boils down to; “What does the customer want to spend.”

V-M Electronic Servo Control

V-M Electronic Servo Control Command Potentiometer Servo Valve Amplifier Module Power Supply L.V.D.T.

4-way Style Controls Pumps that use a 4-way style control

4-way Style Controls Pumps that use a 4-way style control PVG

4-way Style Controls Pumps that use a 4-way style control PVG PVK

4-way Style Controls Pumps that use a 4-way style control PVG PVK PVV

4-way Style Controls P-1NN Single Pressure Compensator

4-way Style Controls P-1NN Single Pressure Compensator P-2NN Dual Pressure Compensator

4-way Style Controls P-1NN Single Pressure Compensator P-2NN Dual Pressure Compensator P-A** N.O Proportional Pressure Compensator

4-way Style Controls P-1NN Single Pressure Compensator P-2NN Dual Pressure Compensator P-A** N.O Proportional Pressure Compensator P-B** N.C. Proportional pressure Compensator

4-way Style Controls 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

4-way Style Controls P-1NN/F Single Pressure w/ Load Sense

4-way Style Controls P-1NN/F Single Pressure w/ Load Sense P-1NN/H Single Pressure w/ Horsepower Limiting

4-way Style Controls 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

4-way Style Controls 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 Remote Port 1 GPA OP3 OP4 OP14 OP1 OP2 OP6

P-1NN 4-way Pressure Control Typically this control is used where very fast response is required. Response times of 45-55 milliseconds Set works in sawmills

P-1NN/F Load Sense Control Customer Supplied OP2 OP14

Compensator Adjustment Screw Flow Restriction Control Piston Bias Spring OP-6 OP-1 OP-5 OP-14 Compensator Poppet OP-2 4-way Spool Compensator Adjustment Screw OP-3 OP-9 OP-4 LS Delta P Spring Load Sense Module Load Sense Spool Load Sense Line LS Adjustment Screw

Load Sense - Low Pressure Stand-by Load Sense - Low Pressure Stand-by

Full Stroke Condition

Compensated - Static Condition

P-1NN/F Load Sense Plus LS OP15 Customer Supplied A GPA RP1 OP8 OP3 B

Load Sense Plus - Stand-by Compensator Adjustment Stand-by Adjustment Delta P Adjustment

If the working pressure is 1400 psi Load Sense + Dynamic Condition If the working pressure is 1400 psi 1400 psi 1570 psi Set 400 psi Set 170 psi

P-2NN Dual Pressure Control

P-2NN Compensator - Full Stroke Bias Spring OP-14 OP-5 OP-6 OP-1 4-way Compensator Spool OP-2 OP-3 OP-4 High Pressure Adjustment High Pressure Poppet Solenoid Selector OP-10 Low Pressure Adjustment Low Pressure Poppet

P-2NN Compensator - Full Stroke

P-2NN Compensator - Low Pressure

P-2NN Compensator - High Pressure

P-C NN Soft Start Control

P-CXX Soft Start Control Full Stroke - High Pressure Unloading Solenoid Valve

P-CXX - Soft Start Control Unloaded Unloading Solenoid Valve - Energized

Compensated High Pressure P-CXX Soft Start Control Unloading Solenoid Valve - De-energized

Remote Compensating a 4-way Control for PVG Pumps Small Direct Acting Relief Valve Set 250 psi above maximum remote setting RP1

Remote Pressure Compensating a 4-way Style Control for PVK

Meter-Out Style Controls

Meter-Out Style Controls The meter-out style of control a generally used in circuits, that require quick reaction to small load changes. While overall response time is slower than the PVG pump, the PVM will begin to react as soon as there is a change in the system.

Features of the Meter-Out Control Simple in Design

Features of the Meter-Out Control Simple in Design Compensator uses a 10-2 cavity relief valve.

Features of the Meter-Out Control Simple in Design Compensator uses a 10-2 cavity relief valve. Easily field repairable

Features of the Meter-Out Control Simple in Design Compensator uses a 10-2 cavity relief valve. Easily field repairable Easily field convertible

Features of the Meter-Out Control Simple in Design Compensator uses a 10-2 cavity relief valve. Easily field repairable Easily field convertible Easily field tuned in the field

Features of the Meter-Out Control Simple in Design Compensator uses a 10-2 cavity relief valve. Easily field repairable Easily field convertible Easily field tuned in the field Quick response

Analogy of How the Meter-Out “P” Control of a PVM Pump Functions WHAT AM I ?

Pilot Operated Balanced Relief Valve Relief Valve Adjustment = Compensator Adjustment Differential Orifice = OP2 Main Relief Valve Plunger = Control Piston Pilot Operated Balanced Relief Valve

Compensator Relief Valve Control Piston Main Plunger ISO 10-2 Cavity Pilot Relief Compensator Relief Valve OP-2

Comparison RV vs P Control Comp. RV OP-2 Control Piston

Control Pin

Control Pin Control Pin Control Pin

PVM Meter-out Load Sense

Meter-out Horsepower Limited

Remote Compensating a Meter-Out Control