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

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

3. 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.

4. 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.

5. 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

6. CN & CL Control

7. PVWH 3-Way CN Control
CN Control
CN Control

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

9. CN & CL Control Compensated

10. 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.

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

12. CN & CL Control Diagram 3 2 1

13. CN Control Features
Simplistic Design

14. CN Control Features Simplistic Design Hardened Control Housing
Hardened Housing

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

16. 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

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

18. CU Soft Start Control

19. 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.

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

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

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

23. CU Control Diagram

24. CF Load Sense Control

25. 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.

26. Customer Supplied Restriction
CF Load Sense Control
Customer Supplied Restriction
CF Control
CF Load Sense Control

27. 2 Speed Motor Circuit - Fixed Volume
1500 PSI
34 GPM
15 GPM
3000 PSI
HP 34 GPM = 35.01
HP 15 GPM = 70.01
34 GPM
Why is the horsepower 15 GPM?

28. Variable Volume - Pressure Compensated
34 GPM
15 GPM
3200 PSI
HP 34 GPM = HP
HP 15 GPM = HP
3000 PSI
HP 15 GPM = HP

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

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

31. CF Control Metered

32. CF Control Diagram

33. C2 Dual Pressure Compensator

34. 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.

35. C2 Dual Pressure Control
C2 Control

36. C2 Control Diagram

37. ER Proportional Pressure Compensator

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

39. 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 .

40. 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.

41. ER Proportional Pressure Control
ER Control

42. ER Control Diagram

43. HP Limiter

44. 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.

45. 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.

46. 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 2400 rpm
2400/1800=1.33 so 40hp/1.33= 30hp
A 1800 rpm limiter will actually be 2400 rpm

47. 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.

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

49. HP Limiter Spool
On Stroke
Balanced Position
Off Stroke

50. HP Limiter Curves

51. CH Hi-LO Compensator

52. 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)

53. 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.

54. 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.

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

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

58. CH Hi-Lo Control

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

60. HN Hand Wheel Control

61. HN Hand Wheel Control

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

63. MN / MS Pintle Control

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

65. 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.

66. 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.

67. MN / MS Pintle Control

68. V-M Electronic Servo Control

69. 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.

70. 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.

71. 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.”

72. V-M Electronic Servo Control

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

74. 4-way Style Controls
Pumps that use a 4-way style control

75. 4-way Style Controls
Pumps that use a 4-way style control
PVG

76. 4-way Style Controls
Pumps that use a 4-way style control
PVG
PVK

77. 4-way Style Controls
Pumps that use a 4-way style control
PVG
PVK
PVV

78. 4-way Style Controls
P-1NN Single Pressure Compensator

79. 4-way Style Controls P-1NN Single Pressure Compensator
P-2NN Dual Pressure Compensator

80. 4-way Style Controls P-1NN Single Pressure Compensator
P-2NN Dual Pressure Compensator
P-A** N.O Proportional Pressure Compensator

81. 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

82. 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

83. 4-way Style Controls
P-1NN/F Single Pressure w/ Load Sense

84. 4-way Style Controls P-1NN/F Single Pressure w/ Load Sense
P-1NN/H Single Pressure w/ Horsepower Limiting

85. 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

86. 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

87. P-1NN 4-way Pressure Control
Features included in these style of controls
Easily Remotely Compensated
Critical Orifice Ports tapped for orifice plugs.

88. P-1NN Compensator
Remote Port 1
GPA
OP3
OP4
OP14
OP1
OP2
OP6

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

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

93. 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

94. Load Sense - Low Pressure Stand-by Load Sense - Low Pressure Stand-by

95. Full Stroke Condition

96. Compensated - Static Condition

97. P-1NN/F Load Sense Plus LS OP15 Customer Supplied A GPA RP1 OP8 OP3B

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

99. 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

100. P-2NN Dual Pressure Control

101. 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

102. P-2NN Compensator - Full Stroke

103. P-2NN Compensator - Low Pressure

104. P-2NN Compensator - High Pressure

105. P-C NN Soft Start Control

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

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

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

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

110. Remote Pressure Compensating a 4-way Style Control for PVK

111. Meter-Out Style Controls

112. 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.

113. Features of the Meter-Out Control
Simple in Design

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

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

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

117. 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

118. 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

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

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

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

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

124. Control Pin

125. Control Pin
Control Pin
Control Pin

126. PVM Meter-out Load Sense

127. Meter-out Horsepower Limited

128. Remote Compensating a Meter-Out Control