Servicing
Diaphragm Vacuum Pumps UN86_.16I
8
5. Servicing
Before working on the pump, isolate the power supply
securely, then check that the lines are not live.
Diaphragm and valve plate are the only parts of the pump subject
to wear. They are simple to change.
Always change diaphragm, valve plate and sealing ring at the
same time. If diaphragm and valve plate are not changed at the
same time the nominal performance of the pump is not guaranteed
after the service.
If aggressive, toxic or other types of gases hazardous to health
have been pumped please observe:
1. Clean the pump and its components before servicing.
2. Ensure that the service personnel is not subject to a health
hazard during diaphragm and valve plate changes. Apply the
necessary safety measures (example: the use of protective
gloves).
3. Ensure that the discarded parts and materials are safely and
correctly disposed of.
After opening the pump head, or replacing the diaphragm and
valve plate the initial gas-tightness is no longer guaranteed. A leak
test is able to verify that the original standard of gas-tightness has
been achieved.
Spare part*
Quantity
Valve plate
1
Wave diaphragm (assembly
consisting of two equivalent parts)
1
O-ring
1
Tab. 1
* According to Spare parts list, section 8
Tools/Material
Fork wrench or socket wrench 5.5 mm
Pin-wrench for two hole nuts, pin diameter 4 mm (available as
“wrench for retainer plate”, a KNF accessory, see section 9)
Holding tool (see accessories, section 9)
Heat-resistant thread adhesive (e.g. DELO ML 5327)
Felt-tip pen
Tab. 2
Change the structured diaphragm and valve plate in the following
sequence:
a) Preparatory step
b) Removing pump head
Parts required
Tools/material required
