Valve Repair; Double Ball Valves - ProMinent TZ Operating Instructions Manual

12.3

Valve repair

12.3.1

Double ball valves

Cleaning a discharge valve
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 part kits. In case of doubt, refer to
–
the exploded views and ordering information contained
in the "Supplementary information CD for ProMinent
pump operating instructions".
Clean the discharge and suction valves only one after
another as they cannot be differentiated using the arrow
markings.
Taking the discharge valve apart
1. Unscrew the discharge valve from the dosing head and rinse out.
2. Dismantle the discharge valve.
3. Rinse and clean all parts.
4. Replace the worn parts and seals.
Assembling the discharge valve
When assembling, take note of the orientation of the valve
seats (3). The valve seats (3) are used as a ball seat on the
fine machined side and as a ball cage and spring guide on
the other side. The fine machined side must point in the flow
direction with all valve seats.
When assembling the valves, take note of the sequence:
Teflon – Metal – Teflon – Metal - ...
Repairs
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