Typical operating curve
0
0
Q max
Pressure
Fl
o
w
P101 969E
PC setting
R
emot
e PC setting
Closed center circuit with remote PC
P101 966
The remote PC control uses a pilot line connected to an external hydraulic valve. The external valve
changes pressure in the pilot line, causing the PC control to operate at a lower pressure. When the pilot
line is vented to reservoir, the pump maintains pressure at the load sense setting.
When pilot flow is blocked, the pump maintains pressure at the PC setting. An on-off solenoid valve can
be used in the pilot line to create a low-pressure standby mode. A proportional solenoid valve, coupled
with a microprocessor control, can produce an infinite range of operating pressures between the low
pressure standby setting and the PC setting.
Size the external valve and plumbing for a pilot flow of 3.8 l/min [1 US gal/min]. For additional system
protection, install a relief valve in the pump outlet line.
Remote pressure compensated system characteristics:
•
Constant pressure and variable flow
•
High or low 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 remote pressure compensated systems:
•
Modulating fan drives
•
Anti-stall control with engine speed feedback
•
Front wheel assist
•
Road rollers
•
Combine harvesters
•
Wood chippers
PVG 32 main spool with pressure compensated control
The PC control maintains constant system pressure in the hydraulic circuit by varying the output flow of
the pump. Used with a closed center control valve, the pump remains in high pressure standby mode at
the PC setting with zero flow until the function is actuated.
Technical Information
PVG 32 Proportional Valve Group
Function
©
Danfoss | August 2017
520L0344 | BC00000038en-US0802 | 17
