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7.2
Maintenance procedures
Two preventive maintenance procedures are defined for this valve. These are:
•
Replacement of isolation seals (gate and body seal of sealing ring) and valve cleaning. Refer to
chapter: «Replacement of isolation seals and cleaning».
•
Replacement of actuator and actuator shaft seals. Refer to chapter: «Replacement of actuator and
actuator shaft seals».
VAT can give the following recommendations for preventive maintenance:
Replacement of
isolation seals (gate and
body seal of sealing ring)
actuator shaft seals
See figure below:
Body
Gap
Sealing ring
Plate
74/99
MAINTENANCE
•
Required frequency of cleaning and replacement of seals is depending on process
conditions.
•
A critical factor influencing the maintenance period is the lifetime of the vacuum
grease, being limited under increased temperature. In this case grease will
separate to PTFE and oil. The oil may flow and contaminate the valve parts.
unheated
200'000 cycles
1'000'000 cycles
Vacuum grease
Vacuum grease may be distributed and contaminate the valve.
Prevent gap between body and sealing ring from air gun cleaning. Do not clean the
gap between body and sealing ring with compressed air.
Edition 2014-07-10
1)
heated ≤ ≤ ≤ ≤ 80 °C
6 months but
max. 200'000 cycles
6 months
NOTICE
Series 651
1)
heated > 80 °C
3 months but
max. 200'000 cycles
3 months
605451EC
1)
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