Pressure Compensated System Characteristics; Typical Applications For Pressure Compensated Systems; Pvpc Adapter For External Pilot Oil Supply; Pvpc With Check Valve For Open Center Pvp - Danfoss PVG 32 Technical Information

Technical Information
PVG 32 Proportional Valve Group
Function

PVPC adapter for external pilot oil supply

18 | © Danfoss | August 2017
Typical operating curve
Q max
0
0 Pressure
Once the closed center valve is opened, the PC control senses the immediate drop in system pressure
and increases pump flow by increasing the swashplate angle.
The pump continues to increase flow until system pressure reaches the PC setting.
If system pressure exceeds the PC setting, the PC control reduces the swashplate angle to maintain
system pressure by reducing flow. The PC control continues to monitor system pressure and changes
swashplate angle to match the output flow with the work function pressure requirements.
If the demand for flow exceeds the capacity of the pump, the PC control directs the pump to maximum
displacement. In this condition, actual system pressure depends on the actuator load.
For additional system protection, install a relief valve in the pump outlet line.

Pressure compensated system characteristics

•
Constant pressure and variable flow
•
High pressure standby mode when flow is not needed
•
System flow adjusts to meet system requirements
•
Single pump can provide flow to multiple work functions
•
Quick response to system flow and pressure requirements

Typical applications for pressure compensated systems

•
Constant force cylinders (bailers, compactors, refuse trucks)
•
On/off fan drives
•
Drill rigs
•
Sweepers
•
Trenchers

PVPC with check valve for open center PVP

PVPC with check valve is used in systems where it is necessary to operate the PVG 32 valve by means of
the electrical remote control without pump flow. When the external solenoid valve is opened, oil from
the pressure side of the cylinder is fed via the PVPC through the pressure reducing valve to act as the
pilot supply for the electrical actuators. This means that a load can be lowered by means of the remote
control lever without starting the pump.
The built-in check valve prevents the oil from flowing via the pressure adjustment spool to tank. With the
pump functioning normally the external solenoid valve is closed to ensure that the load is not lowered
Simple closed center circuit
P101 166E
P101 965
520L0344 | BC00000038en-US0802