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
7/12
3 Operation
3.1 Normal
operation
Warning: Keep fingers and objects away from the valve opening!
The fast closing valve series 75.2 may only be operated by the controller VF-2 (series 77). Start-up
and operation of the complete system is described in a separate manual.
The valve is closed and opened by compressed air. The valve is kept in the open position by a latch
in the actuator. The cylinder is permanently maintained under compressed air pressure.
Closing is initiated by electromagnetically releasing the latch. After releasing, the compressed air
pressure acts immediately on the cylinder. This results in an extremely short closing time. The final
stage of closing is pneumatically dampened.
To open the valve, the cylinder is actuated by compressed air via a solenoid. The cylinder is engaged
with the latch and pressurized again at the end of the opening movement.
