Preventive Maintenance; Instruction How To Change The Vatring - VAT 570 Series Installation, Operating, & Maintenance Instructions
All-metal angle valve single acting pneumatic actuator with closing spring
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7.2
Preventive Maintenance
If there is a small leak please try to clean the sealing surface and the seal ring with a lint
free towel and some alcohol.
If this doesn't help you can increase the sealing force by increasing the closing torque. The
maximum torque is specified in the table under normal operation.
7.2.1
Instruction how to change the VATRING
Item numbers refer to the drawing on page 25.
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Description
closing torque of screw with venting hole (pos. 64)
closing torque of bonnet screw (pos. 66)
24/36
MAINTENANCE
It's not allowed to exceed the maximum specified torque.
Don't touch inside valve parts without gloves.
Open the valve and remove the bonnet screws (Pos.66).
Remove valve insert and bonnet seal (Pos.36/2).
When opening or tightening screw (Pos.64) the bellows must be
protected against turning (torsion) → shown on
the next page.
Remove VATRING.
Take a lint free tissue dabbed with alcohol and clean all sealing surfaces
(plate, bonnet, body seat and VATRING).
Check sealing surfaces (visually) for scratches.
Clean VATRING and plate with clean and dry compressed air.
Place VATRING on sealing surface of the plate.
Align VATRING parallel with the frontal of the plate.
Place holding ring on top of plate.
Insert screw (Pos.64), protect bellow against turning,
tighten screw (torque see list).
Place new bonnet seal (fig.36/2) exactly like shown on next page (fitting position)!
Put valve insert back into valve body and tighten bonnet screws
in crosswise order (see torque list).
Edition 14.02.2019
Series 570
Torque (DN 100 / 160)
15 Nm
35 Nm
215086EG
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