7.3.3 Mount the diaphragm head and valves
Spacer disks
Spacer disks are available in 3 sizes:
● 13.0 × 6.4 × 0.5 mm
● 13.0 × 6.4 × 0.1 mm
● 16.0 × 6.4 × 0.05 mm
The number and size of the spacer disks vary between the diaphragm heads.
Install the same number and size of original spacer disks per diaphragm head.
Required tools
● Open-end wrench,
WAF 14
● Open-end wrench,
WAF 17
● Allen key,
WAF 4
Procedure
1. Rotate the diaphragm pump so that the diaphragm head to be mounted is facing upwards.
2. Screw the diaphragm into the connection rod by hand.
– The diaphragm has a right-hand thread.
– Pay attention to the spacer disks.
3. Place the valves and the sealing rings in the intermediate plate.
4. Position the intermediate plate.
5. Put on the diaphragm head cover.
– Observe the sealing rings and the seal on the suction side.
6. Screw the interior hexagon socket screws into the diaphragm head cover.
7. Mount the hose connection using the banjo bolts.
8. Screw the gas ballast valve into the banjo bolt.
– Be careful with the O-ring.
7.4 Cleaning the gas ballast valve
The gas ballast filter is soiled if the vacuum pump takes in ambient air containing dust during gas ballast
operation.
As the soiling increases, the throughput of the gas ballast filter decreases. The risk of condensation and
corrosion in the vacuum pump increases.
Required tool
● Bolt,
max. Ø 3.5 mm
● Screwdriver
Required consumables
● Compressed air
● Clean, dry cloth
1
2
3
4
5
6
7
8
Fig. 6:
Gas ballast valve
1 Valve housing
5
Circular spring
2 O-ring (2x)
6
Gas ballast filter
3 Sleeve
7
Reducing piece
4 USIT ring
8
O-ring
Maintenance
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