Installation, Operating & Maintenance Instructions
Series 650, DN 100 – 250 (I.D. 4" - 10")
VAT Vakuumventile AG, CH-9469 Haag, Switzerland
Tel ++41 81 771 61 61 Fax ++41 81 771 48 30 Email reception@vat.ch www.vatvalve.com
258550EE
2007-05-11
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5.1 Maintenance procedures
Keep fingers out of the valve during maintenance work.
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
• Replacement of actuator feedthrough seals
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.
VAT can give the following recommendations for preventive maintenance:
unheated *)
heated ≤ 80°C *)
heated > 80°C *)
isolation seals (gate and body seal of sealing ring)
200’000 cycles 6 months but
max. 200’000 cycles
3 months but
max. 200’000 cycles
actuator feedthrough seals
1 Mio. cycles 6 months 3 months
*) This figures are reference values for clean conditions under various temperatures. These values do not include any
impact of the process. Therefore preventive maintenance schedule has finally to be checked for the actual process
conditions.
Prevent gap between body and sealing
ring from air gun cleaning. Otherwise
vacuum grease may be distributed and
contaminate the valve.
valve body
gap
sealing ring
pendulum plate
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