Installation, Operating & Maintenance Instructions
Series 612 DN 40-50 (I.D. 1.5“ - 2”), Logic
VAT Vakuumventile AG, CH-9469 Haag, Switzerland
Tel +41 81 771 61 61 Fax +41 81 771 48 30 [email protected] www.vatvalve.com
289419EB
2011-12-12
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5.1 Maintenance
procedures
Keep fingers out of the valve during maintenance work.
Use cleanroom gloves during maintenance work.
One p r e v e n t i v e m a i n t e n a n c e procedure is defined for this product. This is:
Replacement of shaft feedthrough seals and valve cleaning.
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 *)
shaft feedthrough seals
2’000’000 cycles
6 months but
max. 2’000’000
cycles
3 months but
max. 2’000’000
cycles
*) 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.
Furthermore the following maintenance procedures are described:
Replacement of plate
Replacement of control and actuating unit or valve unit
Replacement of valve body or mechanical unit
