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
42/51
Replacement of isolation seals (gate and body seal of sealing ring) and valve cleaning
Replacement of actuator feedthrough seals
D e s c r i p t i o n Required tool
1. Vent both valve chambers.
2. Open bonnet screws and remove
valve bonnet.
Allen wrench
5mm
3. Open valve
Caution: Stand away from valve –
pendulum plate moves out of the
valve body.
4. To prevent the pendulum plate from
moving during work, switch the valve
to safety mode. Refer to «3.1.3
Safety mode» for details.
5. Unfasten mounting screw for
pendulum plate.
6. Remove pendulum plate.
pendulum plate mounting screw
for pendulum plate
open end wrench
13mm
7. With one hand press the
MAINTENANCE BUTTON to lower
the sealing ring, with your second
hand unlock the sealing ring by
pressing the handle.
8. Release MAINTENANCE BUTTON.
9. Remove sealing ring.
maintenance button
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