11.1 Cleaning valves
Unsuitable spare parts for the valves may lead to problems
for the pumps.
–
Only use new components that are especially adapted to
fit your valve (both in terms of shape and chemical
resistance).
–
Use the correct spare parts kits. In case of doubt, refer
to the exploded views and ordering information in the
appendix.
Only with the "Physiologically safe" design:
WARNING!
Product can be dangerously contaminated
Only use the spare parts from the "Physiologically safe"
spare parts kits.
Personnel:
n
Technical personnel
CAUTION!
Warning of personal injury and material damage
Feed chemical may escape from the liquid end, for example,
if ball valves not repaired correctly.
– Only use new components which fit your valve - both in
terms of shape and chemical resistance!
– Note the flow direction of the discharge and suction con‐
nectors when fitting the valve.
CAUTION!
Warning of feed chemical spraying around
PTFE seals, which have already been used / compressed,
can no longer reliably seal a hydraulic connection.
– New, unused PTFE seals must always be used.
Fig. 21: Simple cross-section through ball valve
1 Flat seal
2 Valve body
3 Valve ball
4 Valve seat
5 Valve cap
Repairing ball valves
Repairs
35
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