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
10/12
5.1 Replacement of actuator/gate assembly
The figures in brackets refer to the drawing on page11
a) Removal of actuator/gate assembly
1. Vent vacuum chambers on either side of valve
2. Open valve
3. Disconnect compressed air
4. Disconnect electrical power
5. Remove compressed air line and socket (28/4) for electrical connection
6. Remove screws (28/19) from bonnet
7. Withdraw actuator/gate assembly carefully from body and put it on a clean place
b) Installation of actuator/gate assembly
8. Check and clean sealing surfaces of bonnet and valve seat
9. Put new bonnet seal «VATSEAL» (28/10) on body or bonnet (depending on mounting position)
Attention: Bordering of 2 bore holes must be on the body side!
10. Insert actuator/gate assembly carefully. At first, insert two screws (28/19) and tighten them slightly only at both
centering holes (bordering) of the bonnet seal VATSEAL (28/10). Afterwards, tighten all screws (28/19) uniformly in
diagonal crosswise order, in 2 or 3 steps, by means of the supplied hexagon pin spanner.
Notice! A suitable torque wrench with the appropriate hexagonal insert to tighten the screws
(torque: 9 Nm) is available from VAT (see Spare parts).
11. Connect socket (28/4)
12. Connect compressed air
13. Perform function and leak test
Valve is ready for operation
Replacement of gate
The figures in brackets refer to the drawing on page11
1. Press out pin (28/22) by means of tool
2. Take new gate (28/2) and press in new pin (supplied
with new gate) by using the same tool
Attention: Inspect position of pin in the opening. The
pin must be flush with the valve shaft!
Inspect position of pin!
Replacement of bonnet seal
See «Removal and installation of actuator/gate assembly» page 10.
