Pvg 100 Component Troubleshooting; Open Center Pressure Relief Valve; Closed Center Pressure Relief Valve; Pressure Reducing Pilot Valve - Danfoss PVG 100 Service Manual

Service Manual

PVG 100 Component Troubleshooting

Open Center Pressure Relief Valve

Failure mode
Will not build pressure
External leaking
Pressure setting is wrong

Closed Center Pressure Relief Valve

Failure mode
Will not build pressure
External leaking
Pressure setting is wrong
Instability when PC and inlet relief has too low of
a delta between them

Pressure Reducing Pilot Valve

PVG 100 Proportional Valves
Description: Adjustable relief valve. Adjustment range 50 Bar [700 PSI] to 350 Bar [5000 PSI].
Location: The relief is in all PVP Inlet modules
Function: Pilots the unloading valve to open when the load exceeda a set pressure.
Cause
Contamination
Damaged seat and poppet
Pressure adjustment backs off (on open center
application)
Serviceability: Non serviceable.
Valve removal tool P/N: 155L6485. Torque to 20 Nm [180 lbf•in].
Description: Adjustable relief valve. Adjustment range 50 Bar [700 PSI] to 350 Bar [5000 PSI].
Location: The relief is in all PVP Inlet modules
Function: Provides maximum pressure setting below pump pressure setting 30 Bar [450 PSI] Delta for
closed center.
Cause
Contamination
Damaged seat and poppet
Pressure adjustment backs off (on open center
application)
PC at pump should be set 30 bar above relief
valve
Serviceability: Non serviceable.
Valve removal tool P/N: 155L6485. Torque to 20 Nm [180 lbf•in].
Description: Pressure reducing valve at fixed pressure.
Location: The pressure reducing valve is in all PVP Inlet modules.
Function: Provides 10-15 bar [145-218 psi] internal pressure for electrical (PVE) actuators or provide 25
Bar (360 PSI) (PVHC) and supply for external remote hydraulic actuators (HRC). These pressures are only
present when the load pressures are high enough to satisfy the required regulated pressure. The open
center system at low pump flow may only develop 9 Bar (130 PSI)
11048807 • Rev BA • October 2014
Corrective action
While under pressure, back out to minimum
pressure and allow oil to leak by for approx. 5
seconds and then readjust to correct pressure -
Replace valve
Replace complete assembly
Adjust to model code specification
Corrective action
While under pressure, back out to minimum
pressure and allow oil to leak by for approx. 5
seconds and then readjust to correct pressure -
Replace valve
Replace complete assembly
Adjust to model code specification
Adjust to model code specification
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