Pvmr, Friction Detent; Pvmf, Mechanical Float Position Lock; Pvbs, Main Spools For Flow Control (Standard) - Danfoss PVG 32 Technical Information

Technical Information
PVG 32 Proportional Valve Group
Function

PVMR, friction detent

PVMF, mechanical float position lock

PVBS, main spools for flow control (standard)

20 | © Danfoss | November 2017
When the main pump flow fails, the external shuttle valve ensures that the oil flow from the manually
operated emergency pump is used to pilot open the over center valve and lower the load. The load can
only be lowered using the mechanical operating lever of the PVG 32 valve.
The friction detent PVMR allows the directional spool to be held in any position, resulting in infinitely
variable, reversible, pressure compensated flow.
This can be sustained indefinitely without having to continue to hold the mechanical lever. Friction
detent spool position may be affected by high differential actuator flow forces and system vibration
resulting in work function flow reduction.
PVMR, friction detent
Allows the float spool to be held in the float position after release of the mechanical handle.
PVMF, standard mount only
P → A → F (Push-in)
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 control (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 control. This will normally give optimum and stable
adjustment of the oil flow.
PVMF, optional mount only
P → A → F (Pull-out)
BC00000038en-US0803