Table Of Contents - Danfoss PVG 32 Service Manual

Service Manual
PVG 32 Proportional Valve Group
Contents
Introduction
Operation
System Troubleshooting
PVG 32 Component Troubleshooting
© Danfoss | February 2017
Overview..............................................................................................................................................................................................5
General instructions........................................................................................................................................................................ 5
Remove the unit.......................................................................................................................................................................... 5
Keep it clean..................................................................................................................................................................................5
Replace all O-rings and gaskets............................................................................................................................................. 5
Secure the unit............................................................................................................................................................................. 5
Safety precautions............................................................................................................................................................................6
Unintended machine movement..........................................................................................................................................6
Flammable cleaning solvents................................................................................................................................................. 6
Fluid under pressure.................................................................................................................................................................. 6
Personal safety............................................................................................................................................................................. 6
Hazardous material.................................................................................................................................................................... 6
Acronyms.............................................................................................................................................................................................6
PVG 32 group with open center PVP (PVB with flow control spool)..............................................................................8
PVG 32 group with closed center PVP (PVB with flow control spool)........................................................................... 8
PVG 32 sectional drawing..............................................................................................................................................................9
PVPC plug for external pilot oil supply..................................................................................................................................... 9
Friction detent.................................................................................................................................................................................11
PVBS, main spools for flow control (standard).................................................................................................................... 12
PVBS, main spools for flow control (with linear characteristics)................................................................................... 12
PVBS, main spools for pressure control................................................................................................................................. 12
PVPX Electrical LS unloading valve..........................................................................................................................................13
Overview........................................................................................................................................................................................... 14
Troubleshooting a PVG valve.................................................................................................................................................... 14
No cylinder/motor response in either direction when remote controller is actuated......................................... 15
Cylinder/motor responds in one direction only................................................................................................................. 16
Main valve spool moves without oil passing to cylinder/motor.................................................................................. 16
Cylinder/motor operates without remote controller being operated....................................................................... 17
Cylinder/motor responds slowly to remote electrical or hydraulic controller actuation.................................... 17
Erratic cylinder/motor response to electrical or hydraulic controller operation.................................................... 17
Hydraulic oil supply.......................................................................................................................................................................18
Electrical supply..............................................................................................................................................................................18
Hydraulic (remote) pilot control pressure.............................................................................................................................19
Pressure relief valve.......................................................................................................................................................................20
Pressure reducing pilot valve.................................................................................................................................................... 20
Pressure gauge connection........................................................................................................................................................21
Open center plug........................................................................................................................................................................... 22
Closed center plug and orifice.................................................................................................................................................. 23
Pressure adjustment spool......................................................................................................................................................... 24
LS connection..................................................................................................................................................................................25
LS signal.............................................................................................................................................................................................25
Shuttle valve.................................................................................................................................................................................... 26
LS pressure limiting valve........................................................................................................................................................... 27
LS A, B shuttle.................................................................................................................................................................................. 27
Main spool........................................................................................................................................................................................ 28
Shock and anti-cavitation valve PVLP.....................................................................................................................................29
Pressure compensator..................................................................................................................................................................30
Load drop check valve ................................................................................................................................................................ 31
Maximum oil flow adjustment screws for ports A and B................................................................................................. 32
PVM module.....................................................................................................................................................................................33
PVS module...................................................................................................................................................................................... 34
PVPVM module............................................................................................................................................................................... 35
PVAS module................................................................................................................................................................................... 36
PVPX LS unloading valve.............................................................................................................................................................37
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