Testing; Pvg 16 And 32 Leak Test; Pressure Setting After Assembly - Danfoss PVG 16 Service Manual

Service Manual
PVG 16 and 32 Service Assembly/Disassembly Guide

Testing

PVG 16 and 32 leak test

Pressure setting after assembly

22 | © Danfoss | November 2017
After all components have been assembled and tightened to the proper specifications, a leak test with
compressed air must be performed.
1. Block off all "A" and "B" ports with steel plugs.
2. Block off the "P" port with a steel plug in the PVP. Screw the compressed air connection into the "T"
port. (see the figure below).
Block diagram
6.4 ± 1 bar
[93 ± 14.5 psi]
T
P
PVP LS
6.9 bar [100 psi]
3. Apply compressed air at 6.9 bar [100 psi] for 5 minutes. At the same time, activate all PVM control
levers in order to fill fill all channels, chambers and cavities with an air.
4. Shut off the compressed air so that pressure is confined in the entire valve.
The permissible pressure drop in the valve is 0.5 bar [7 psi] per minute maximum. Small leaks can be
traced by pouring a small amount of oil onto the place where the leak is thought to be present.
5. Try correcting small leaks by retightening the assembly. Large leaks usually indicate forgotten or
squeezed O-rings.
All relief valves must be set with a gauge located in the gauge port of the PVP.
•
Groups with CLOSED CENTER PVP'S can be tested as assembled for all pressure relief settings.
•
Groups with OPEN CENTER PVP'S and PVB'S with shock valves (PVLP) and LS
pressure lower than the pressure setting in the PVP. The PVP must be modified temporarily to
CLOSED CENTER. After the relief settings are made, the PVP must be corrected to OPEN CENTER. All
other with OPEN CENTER PVP'S can be tested as assembled.
•
The PVP and LS /LS pressure relief valves must be set by applying oil pressure on the "P" port in the
A B
PVP. The "T" port must be connected to tank.
•
All "A" and "B" ports must be blocked off with steel plugs.
•
The quantity of oil supplied to the valve assembly must be at least 15 +/- 2 L/min [4 +/- 0.45 US gal/
min].
•
The CLOSED CENTER PVP module can be set by applying pressure to the "P" port.
•
The OPEN CENTER PVP module can be set by applying pressure to the "P" port and activating the
spool in the A or B direction dead headeding the A or B port.
•
It is assumed that the PVP module has a higher setting than the LS
be set one at a time by activating the spool in the PVB section in the direction of the LS valve to be
adjusted.
•
Adjustment of the relief valve is accomplished by using a 4 mm hex wrench.
A B A B A
PVB PVB PVB
B
LX
PVS/I
V310343.A
/LS valves with opening
A B
/LS valves. LS /LS valves must
A B A B
L1104530 | AX00000133en-US0106