Bulletin MSG30-3245-INST/UK
Installation Manual
7
Parker Hannifin
Pump & Motor Division Europe
Chemnitz, Germany
Axial Piston Pump
Series PV, series 44 and higher
4. Standard pressure compensator
with D03 interface, code ...MM1
The standard pressure compensator code ...MM1
has topside an NG6/Cetop 3/NFPA D03 interface for
the mounting of suitable pilot valves. This compensa-
tor can for example be directly equipped with a pro-
portional pressure pilot valve for electrical pressure
setting (ordering code ...MMK, see figure on page 9).
The pilot valve must be capable of pilot flows of
approx. 1,2 l/min. Therefore a nominal flow range of
3 - 6 l/min is recommended. A too small as well as
a too large pilot valve can lead to unsatisfactory
compensator performance.
In addition the compensator can be equipped with a
directional control valve for stand-by (unloading) func-
tions (ordering code ...MMW, see figure on page 9).
Please note:
when mounting accessories (e. g.:
proportional pressure pilot valve) or external (remote)
control the integrated pilot valve first must be turned
in to avoid too early pressure limitation.
compensator differential adjustment
pressure adjustment
lock nut
lock nut
interface NG6 DIN 24 340
compensator differential adjustment
lock nut
pressure adjustment
lock nut
5. Standard pressure compensator for
accessory mounting, code ...MMZ
interface NG6 DIN 24 340
Version ...MMZ is designed especially for compen-
sator accessory mounting (ordering code PVAC...,
see chapter 12).
Because the accessory packages come with their
own pilot valves, this version has no integrated pilot
catridge to avoid unwanted interaction.
For more details on the different compensator op-
tions see also the PV compensator spare parts
manual for compensator design 45, Parker bulletin
PVI-PVC-45-GB.pdf.
Note:
Checking and adjusting the compensator differential
should always be done by using two pressure sen-
sors/gages. Measuring one pressure only (pump
outlet pressure) and assuming, that the pilot pres-
sure at fully unloaded pilot valve resp. with unload
proportional pilot valve is 0 bar can lead to completely
wrong adjustments.
The different pilot valves can cause even at the nomi-
nal pilot flow (1,2 - 1,4 l/min) already significant back
pressures which add to the compensator differential.
Only if the pilot pressure chamber is completely un-
loaded (e. g.: when one of the side plugs is removed
or the DCV is in stand-by mode) it can be assumed,
that the pilot pressure is zero and pump outlet pres-
sure is equal to the compensator differential setting.
compensator differential
adjustment
lock nut