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Copyright © AVK Holding A/S, original version, rev. 1, 8-July-2021
10. Trouble shooting
Symptom:
Leakage between the body and bonnet
Cause:
Bolts loosen / Diaphragm broken
Cure:
Tighten the bolts / replace new Diaphragm
Symptom:
Valve malfunctional
Cause:
PSV pilot issue
Cure:
Check and replace with new pilot valve
11. Recommended spare parts
Only genuine AVK spare parts should be used.
AVK accepts no responsibility for damage caused by failing non-AVK parts.
The use of inferior materials or parts in a valve can have serious consequences. It is AVK policy
therefore, to use only materials of the highest quality, manufactured to our own designs and
thoroughly checked and tested in accordance with our internal Quality Assurance system that is
approved to ISO 9001:2000. It is absolutely essential therefore, that in order to guarantee the
highest level of safety and performance, only genuine AVK spare parts are used. AVK can accept
no responsibility whatsoever for the fitting and subsequent failure of any non-AVK or non-
approved parts.
Following spare parts are recommended to purchase with a series 869 diaphragm operated
control valves:
Item No
Description
Material
Qty
1
Disc Seal
EPDM
1
2
Spring
Stainless Steel
1
3
Diaphragm
EPDM
1
4
O-Ring
EPDM
3
5
Gasket
EPDM
1
6
O-Ring
EPDM
1
