Installation, Operating & Maintenance Instructions
Series 615 DN 63-100 (I.D. 2.5“ - 4”), RS232
VAT Vakuumventile AG, CH-9469 Haag, Switzerland
Tel +41 81 771 61 61 Fax +41 81 771 48 30 [email protected] www.vatvalve.com
290227EA
2011-06-24
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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 and under clean condition:
Seal
Maintenance recommendation
Plate
Stainless steel (615 . . - .
E . . - . . . .)
Exchange after 100’000 isolation cycles or 2’000’000 control cycles
Aluminium hard anodized (615 . . - .
H . . - . . . .)
Exchange after 100’000 isolation cycles or 2’000’000 control cycles
Shaft feedthrough
Exchange after 2’000’000 control cycles
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:
Procedure 1
Replacement of plate and plate o-rings
1
) (without disassembly of control and actuating unit)
Replacement of plate and plate o-rings
1
)
Replacement of control and actuating unit or valve unit
1
)
Procedure 2
Replacement of valve body
1
) or mechanical unit
