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Technical Information
Functionality
10
PVE, Series 4 for PVG 32/100/120 and PVHC
PVG functionality
The PVG valve distributes oil from pump flow to a particular work function in the application via a specific
valve section. This is done by moving the spool (PVBS).
Depending on the choice of components the oil work flow enters the PVG through the PVP (proportional
valve pump side module), a PVSK, a mid inlet or other system interface and enters the PVB (proportional
valve basic module) via the P gallery and leaves through the T gallery.
The PVP/PVSK also supplies the Pilot oil pressure (Pp) for the PVE to activate the spool (PVBS). Special
designed float spools also allow oil flow in both directions between A- and B-port not opening to pump
nor tank.
When looking at the figure you see the valve section from PVP towards PVS with the PVM and PVE
standard mounted. When PVM and PVE are interchanged it's called option mounted.
Valve section with naming - standard mounted - seen from PVP
Pilot oil supply
PVE
Electronics
NC Solenoid valve
NO solenoid valve
Oil out of A-port = PVM pushed towards PVB = retract = LVDT moves into PVE.
With the spool in neutral, default position when held by the neutral spring, the connection to the
application via ports is blocked. Moving the PVBS towards the PVE, as in the figure, opens a connection
between P and A and also between B and T. This is done by either pushing the PVM or activating the PVE.
The PVE moves the PVBS by letting Pilot Oil Pressure (Pp) push on the right end of the PVBS and releasing
pressure from the left end. For details on PVG 32 please see PVG 32 Proportional Valve Groups, Technical
Information, 520L0334.
PVE functionality
This section has focus on how the PVE works and interacts. The description here is general and variant
specific descriptions will all refer to this.
The PVE is an electro mechanical device, meaning that functionality is depending on mechanical,
hydraulic, electrical and control conditions given by PVE, PVG, application and vehicle. The result of this is
that implementing operation and safety conditions also must include vehicle specific considerations.
Hydraulic subsystems
The hydraulic subsystem is used for moving the spool and thereby open the valve for work flow.
520L0553 • Rev GD • Jan 2014
B port
A port
Oil
<- Retract towards PVE
LVDT
Extend away from PVE ->
P -> A
PVB
PVM
Neutral spring
PVBS
V310072.A
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