Preventive Maintenance Procedures - VAT 650 Series Installation, Operating, & Maintenance Instructions

5.1

Preventive maintenance procedures

Keep fingers out of the valve body during preventive maintenance work. The sealing ring or its retaining
pins will lower in case of electrical power failure or loss of compressed air.
Take precautions to protect yourself from harmful substances that may have contaminated the valve
during use.
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:
isolation seals (gate and body seal of sealing ring)
actuator feedthrough seals
*) These 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.
Replacement of isolation seals (gate and body seal of sealing ring) and valve cleaning
Replacement of actuator feedthrough seals
VAT Vakuumventile AG, CH-9469 Haag, Switzerland
Tel +41 81 771 61 61 Fax +41 81 771 48 30 CH@vatvalve.com
Installation, Operating & Maintenance Instructions
Series 650, DN 250 (I.D. 10"), RS232
unheated *)
200'000 cycles
1 Mio. cycles
sealing ring
pendulum plate
heated ≤ 80°C *)
6 months
6 months
valve body
gap
www.vatvalve.com
heated > 80°C *)
3 months
3 months
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2010-04-17