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8.3 Maintenance of the pilot valve
10 .
16 .
Fig. 4: Maintenance of the pilot valve
Dismantle the pilot valve
Reassemble the pilot valve
To carry out maintenance on the pilot valve first dis‐
connect the compressed air supply, vent the double
diaphragm pump and remove the air supply line from
the double diaphragm pump.
22.
13 .
14 .
15 .
1.
Remove both tensioning straps
2.
Screw out the outer diaphragm flange, diaphragms and inner
diaphragm flange together in an anti-clockwise direction
3.
To be able to remove the piston (23) of the pilot valve, you
must remove the O-ring (24) at one end of the piston
4.
Press the piston out of the control cylinder and inspect the O-
rings (24) for damage and wear
ð Replace damaged O-rings
5.
To remove the control cylinder, remove the safety collar (22)
6.
Examine the inside of the control cylinder (20) of the pilot
valve to determine if it is dirty or scratched or has any other
defects
ð If necessary replace the control cylinder (20)
7.
Lightly grease the six O-rings (21)
8.
Push the control cylinder from the chamfered end of the hole
into the pump housing (13)
9.
Secure the control cylinder using the safety collar (22).
10.
Lightly grease the four inner O-rings of the piston (23)
11.
Insert the piston (23) in the control cylinder
Maintenance of the double diaphragm pump
6.
3.
12.
21.
20 .
23 .
7.
3.
2.
11.
10.
9.
8.
1.
3.
6.
7.
24.
A1137
23
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