14
Parker Hannifin Manufacturing Germany GmbH & Co. KG
Pump & Motor Division Europe
Chemnitz, Germany
Electro hydraulic proportional controls version 45 for
axial piston pumps, PV series
Bulletin MSG30-3254-INST/UK
Installation and setup manual
The pump accessory manifold code
PVAPVE*
combines preload and quick unload function.
This manifold is flanged direct to the pressure
port of a PV pump. For functional description
see the last chapters.
To ensure a correct function under all working
conditions and to control immediately the load
pressure, the control pressure has to be taken
after the preload valve.
Sensing area of the control spool and spring
chamber are both to be connected by pipe or
8. Preload and quick unload manifold PVAPVE* in combination with compensator codes
...UDP resp. ...UDF
hose to the control ports of this manifold. The
hydraulic circuit diagram in figure 12 display this.
Both functions are built into one manifold. Figure
13 shows this manifold and table 3 lists the main
dimensions.
The dimension L indicates the total length of the
mounting bolts and includes the length screwed
into the pump end cover.
The hydraulic connections between manifold
and pump compensator (ps and pp) are not
included in the pump shipment.
S
T
M
p1
P
A
P
T
A
P
T
S
U
M
WV
B
D2
A
P T
A
P
P
P
T
D
P2
p
P
Mp
p
4 bar
p
P
D
P1
P
T
p
S
p
2
M
p2
p
S
p
M
p
1
T
1.0
VE
X
Q
X
P
I
P
I
Q:A
I
Q:B
W
Q
W
P
pre-load and quick unload manifold,
code:
PVAPVE*
X
Q
= signal, displacement
I
Q:A
= solenoid current A, displacement control valve
I
Q:B
= solenoid current B, displacement control valve
X
P
= signal, pressure sensor
I
P
= solenoid current, pressure pilot valve
W
Q
= command, displacement
W
P
= command, pressure
Figure 12
: Hydraulic circuit of the ...UDP control with pre-load and quick unload manifold