Bulletin MSG30-3245-INST/UK
Installation Manual
8
Parker Hannifin
Pump & Motor Division Europe
Chemnitz, Germany
Axial Piston Pump
Series PV, series 44 and higher
6. Remote pressure compensator,
codes ...MRC, ...MR1 and ...MRZ
The remote pressure compensators code ...MR*
are equipped with a remote control port. To this
port external pilot valves can be connected. The
distance between pump and pilot valve can be up
to 15 m. The pilot line should be designed, to avoid
pressure losses.
Especially at low environmental temperatures a
too narrow pilot line can result in a significant pres-
sure increase. The nominal pilot flow is in the range of
1.2 to 1.4 l/min.
Beside the version shown above (code ...MRC)
also a version ...MR1 with a topside NG6 / D03 inter-
face is available as well as a version ...MRZ without
integrated pilot valve for the use with compensator
accessories code PVAC... .
For the compensators with code ...MM* and
...MR* the pilot pressure pressure supply is main-
tained through an orifice located in the control spool.
pilot orifice integrated pilot valve
pressure pilot chambercontrol spool
compensator differential adjustment
lock nut
remote control port
lock nut
compensator pressure adjustment
The load sensing or flow compensator primarily
controls the pump output flow. To achieve this the
load pressure after a main stream throttle valve (load
sensing valve, not included in the shipment of the
pump) is connected to the load sensing port of the
compensator. The compensator control strategy is,
to keep the pressure drop constant across this main
stream throttle valve.
The integrated pilot valve maintains a pressure
compensation when the adjusted max. pressure is
reached. The pilot orifice Ø 0,8 mm is located in the
load sensing port adapter. This orifice replaces the
orifice in the control spool of the ...MM* and ...MR*
compensators, because pilot pressure is in the load
sensing compensator provided through the load
sensing line.
compensator differential adjustment
lock nut
load sensing port
lock nut
compensator pressure adjustment
Load sensing and pressure compensators only dif-
ferentiate by the control spool and by the location of
the pilot orifice.
Beside the version shown above (code ...MFC) also
a version ...MF1 with a topside NG6 / D03 interface
is available as well as a version ...MFZ without
integrated pilot valve for the use with compensator
accessories code PVAC... .
The following port options are available for remote
pressure and load sensing compensators:
thread and
port code
port thread
dimensions
1
G 1/4 BSPP
3
7/16-20 UNF
7, 8
M12 x 1,5 ISO 6149-1
7. Load sensing compensator, codes
...MFC, ...MF1 and ...MFZ
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