Dustcontrol DC 11-Module Instructions Originales page 29

Service
D
2.
E
Adjusting the vacuum relief valve (not DC 11-Mo-
dule S models)
Th e valve is pre-adjusted with a negative pressure of
(18 kPa). If this needs to be adjusted the following
procedure should be used:
- Connect a manometer to the suction side and
measure with a fully closed inlet.
- Shut down the pump and demount the vacuum
relief valve.
- Remove the damper cover (1) and measure dis-
tance A.
- Loosen the locking nut (3)
1.
Vacuum relief valve (not DC 11-Module S models)
4.
Disassemble the vacuum relief valve (D). Clean
and lubricate shaft and bearings. Check the rubber
gasket (E). Change if cracked or harden ed (Part No.
4710).
3.
Check the function of the hydraulic damper (F).
F
-
Th e compression of the spring (2) determines the
opening pressure. Changing the distance A by 1.5
mm will give a corresponding change in pressure of
1 kPa.
-
-
-
DC 11-Module - 29
Adjust the spring tension by turning the spring
plate (4).
Remount the valve after adjustment and test the
pressure.
Inspect all cables and connections, repair if
neccessary.
Remount the protective panels, power up the
pump and give it a test run.
Part No 94123-B