Installation, Operating, and Maintenance Instructions
Series 01, DN 16 - 50 (5/8" - 2")
VAT Vakuumventile AG, CH-9469 Haag, Switzerland
Tel +41 81 771 61 61 Fax +41 81 771 48 30 [email protected] www.vatvalve.com
271691EB
2009-03-09
12/15
5.3 Replacement of position indicator
Fig 1
Before mounting the new position indicator, move the gate to the
intermediate position
. Then attach new position indicator.
Gate valve with double acting pneumatic actuator:
Move gate to the intermediate position by compressed air.
Gate valve with single acting pneumatic cylinder and closing spring:
Move gate to the intermediate position by compressed air and keep up
an air pressure of approx. 2.5 bar ( 35 psig) in order to maintain the
intermediate position.
Fig 2
Correct mounting of position indicator, i.e. valve piston is not blocked by
the position indicator actuator.
(
see circle marking)
Fig 3
Wrong mounting of position indicator, i.e. valve piston is blocked by the
position indicator actuator (
see circle marking).
In this case, valve cannot be opened.
