10
- The maintenance intervals depend on the application of the valve
and should be determined by the operator carrying out regular
visual checks of the valve.
- The double seal butterfly valve possesses only a few wear parts:
disc seal and bush bearings.
- The customer is recommended to hold spare seals and bush
bearings on stock.
For valve maintenance APV supplies complete seal kits including
seal grease (pl. see spare parts lists).
- If damaged seals are exchanged, generally replace all seals and
bush bearings.
- Slightly grease all seals before their installation.
Grease the disc seal according to the illustration - especially the
cross holes.
- Assembly of the valve and change of the valve design FZ
(normally closed) or FO (normally open) according to Service
Instructions.
- Installation of turning actuator according to Service Instructions.
- The inner parts of the turning actuator do not need service.
Attention! Use food-grade grease and special grease being
suited for the respective seal material, only.
Recommendation:
APV-food-grade grease for EPDM and HNBR
(0,75 kg /can - ref. No. 000 70-01-019/93)
(60 g /tube - ref. No. 000 70-01-018/93)
! Do not use grease containing mineral oil for EPDM seals.
grease
grease
grease
disc seal
9. Maintenance
Double Seal Butterfly Valve
DSV
Operating Manual: rev. 2
UK
DSV-UK2.qxp / 10.2005
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