Installation, Operating & Maintenance Instructions
Series 75.2, DN 40 (I.D. 1 ½”)
VAT Vakuumventile AG, CH-9469 Haag, Switzerland
Tel ++41 81 771 61 61 Fax ++41 81 771 48 30 Email
www.vatvalve.com
207088EB
2005-04-28
8/12
3.2 Operation under increased temperature
See «1.1 Technical data»
The temperatures specified in the technical data must not be exceeded. Temperature differences
exceeding 40°C between gate and seat must be avoided.
3.2.1 Disassembling of the trigger unit for bake out
1. Close the valve and disconnect compressed air pressure (valve is in undefinied position).
2. Then remove the screws as it is shown in pic. 1.
3. Now it is possible to remove the trigger unit (pic. 2).
4. To assemble the trigger unit after the bake out you have to proceed in revers order.
5. Connect compressed air pressure and open the valve.
pic. 1
pic. 2
3.3 Behavior in case of compressed air pressure drop
Valve open:
No change (valve remains open and can no more be closed)
Valve closed:
Valve does not remain leaktight (opens slightly; cannot be opened completely until compressed air is
available again)
We recommend to use an emergency air reservoir at the compressed air input.
3.4 Behavior in case of power failure
The behaviour at power failure can be set inside the controller, either for «no change» or «valve closes».
