Pvbs, Main Spools For Flow Control (Standard); Pvbs, Main Spools For Flow Control (With Linear Characteristics); Pvpp Electrical Pilot Shut-Off Valve - Danfoss PVG 100 Service Manual

Service Manual
Operation

PVBS, Main Spools for Flow Control (standard)

PVBS, Main Spools for Flow Control (with linear characteristics)

PVPP Electrical Pilot Shut-Off Valve

12
PVG 100 Proportional Valves
PVMF
P A F
(Optional assembly)
When using standard flow control spools, the pump pressure is determined by the highest load pressure.
This is done either via the pressure adjustment spool in open center PVP (fixed displacement pumps) or
via the pump regulator (variable displacement pumps).
In this way the pump pressure will always correspond to the load pressure plus the stand-by pressure of
the pressure adjustment spool or the pump regulator.
This will normally give optimum and stable adjustment of the oil flow.
PVBS main spools with linear characteristic have a completely proportional ratio between control signal
and oil flow in the range beyond the dead band.
The PVPP is an electrical pilot shut off valve. When de-energized, the valve connects the pilot supply to
the TØ gallery. In the event of a loss of electrical power, the valve is spring-biased with a connection to
TØ.
The coil on the valve must be energized for pilot oil to be available in the valve stack.
This safety feature vents all hydraulic controls dependant on the PVG 100 pilot supply to the TØ gallery,
thus reducing the possibility of accidental activation of a hydraulic work function.
11048807 • Rev BA • October 2014