1
Countersunk screws
4
Countersunk screws
2
Intake side distributor
5
Cover plate
3
Pressure side distributor
Fig. 19:
Screw couplings on diaphragm head
Installing the distributor
Tools required
● Open-end wrench (17 WAF)
● Crosshead screwdriver
1. Hold the pressure side distributor, including cover plate and all fittings, in position on the pump.
2. Secure the countersunk screws using the crosshead screwdriver.
3. Hold the intake side distributor, including all fittings, in position on the pump.
4. Secure the countersunk screws using the crosshead screwdriver.
5. Secure the screw couplings to all diaphragm heads using the open-end wrench.
9.11 Checking pump function
After working on the pump, you must check the final vacuum. Only where the pump reaches the speci-
fied final vacuum can a low pump leakage rate, and thus the prevention of potentially explosive mixtures
in the pump interior, be ensured.
Checking function of individual diaphragm heads
Tools required
● Standard vacuum gage
1. Measure the intake port pressure in every stage:
– Using the standard vacuum gage, you must be able to measure
< 110 hPa
pressure values at
the intake port.
2. If this pressure value is not reached, check the suction chamber.
3. When doing so, check that valves and diaphragms are correctly seated (centrally to housing hole).
Checking final vacuum
If, following diaphragm valve replacement, the pump achieves the specified final vacuum value only af-
ter being run in for several hours, or unusual noise can be heard, proceed as follows:
1. switch off pump immediately in the event of unusual noise.
2. carry out troubleshooting.
Maintenance
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