Danfoss PVG 100, Техническая информация

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tank via the PVG valve. In this condition the pump control sets the displacement so that leakage in the
system is compensated for, to maintain the set stand-by pressure (pump margin). When a main spool is
actuated the pump control will adjust the displacement so that the set differential pressure between P
and LS is maintained.
The PVG100 Inlet LS relief valve (1) is specifically designed to ensure a constant margin pressure across
the main spool, providing demanded regulated flow during maximum load pressure conditions. This
relief adjustment is critical when there are two or more functions being operated together. An incorrectly
adjusted Inlet relief could result in a vast reduction in regulated flow from the adjacent functions that
operate at a lower load pressure. To accurately adjust the inlet LS relief, the pump standby pressure must
be known in addition to the maximum operating load pressure.
Example
Pressure comp pressure level 172 bar [2500 psi]
LS standby pressure requirement that delivers the desired flow -20 bar [-290 psi]
Maximum load pressure requirement 152 bar [2210 psi]
Inlet relief pressure setting 152 bar [2210 psi]
Optional PVPC with check valve option may be used in systems where it is necessary to operate the PVG
100 valve by means of the electrical remote control without pump flow.
For additional information about PVPC refer to publication 520L0344.
Optional electrically actuated pilot shut off valve PVPP provides additional functional system safety by
removing pilot oil from the electrical actuation or hydraulic actuation system, disabling main spool
actuation. When the PVPP is used with the PVBZ P.O. check valve system it is possible to disable actuation
during mechanical actuation.
PVG 100 closed center priority steering PVPVP module
The priority steering version of the PVPV will accommodate pump flows up to 250 l/min [66 US gal/min]
and Control Flow (CF) up to 60 l/min [16 US gal/min] for dynamic steering systems. Additional return port
is included with the PVPVP module.
PVG 100 closed center PVPVM module
The mid-inlet version of the PVPV will accommodate pump flows up to 400 l/min [106 US gal/min]
providing greater efficiency and flexibility when combined with standard and high flow work function
modules.
PVG 100 basic modules PVB
In the pressure-compensated basic module the compensator (9) maintains a constant pressure drop
across the main spool (11) - both when the load changes and when a module with a higher load pressure
is actuated.
Besides independent flow the other advantage of post-compensated work sections is the ability to
control multifunction operation when flow demand exceeds pump capacity. This means that all work
sections will continue to function regardless of differences in their load and regardless of the pump flow.
The flow relationships specified between functions will be maintained over the full flow range of the
pump.
The shock valves PVLP (10) with fixed setting and the suction valves PVLA on ports A and B are used for
the protection of the individual working function against intermittent pressure overload and/or
cavitation. Optional facilities for dual shock valves for ports A and B provide extra passage area reducing
pressure drop for anti-cavitation applications.
Pilot operated check valve system PVBZ option (6, 8) on ports A and B are uses to reduce the work port to
tank leakage eliminating the need for external actuator load holding in non-critical load holding
applications. All PVG 100 modules contain an integrated T0 drain system to insure optimal performance
Technical Information
PVG 100 Proportional Valve Group
Function
12 | © Danfoss | May 2018 520L0720 | BC00000039en-US0502