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ISO 9001
EN 29001
Installation, Operating, and Maintenance Instructions
Series 021
VAT Vakuumventile AG, CH-9469 Haag, Switzerland
Tel ++41 81 771 61 61 Fax ++41 81 771 48 30 Email reception@vat.ch http://www.vat.ch
205440EC
2003-04-14
5/12
Operation
“Products without differential pressure tabs are specifically designed for operation under equal pressure
on either side. Application of differential pressure through such products may cause damage to the
product and serious injury of people!”
Please refer to the dimensional drawing of the product to ensure it is properly specified for the application.
Normal operation
Valve with pneumatic actuator : Valve is opened and closed pneumatically.
Admissible temperature
See chapter «Technical data».
Compressed air failure
Valve closed:
Valve remains closed (mechanically locked).
Valve open:
Valve position is undefined.
Power failure
Valve supplied with pneumatic connection (ordering code 021 . . - . . 24) :
Valve position depends on applied solenoid valve. VAT recommends to operate all transfer valves with impulse
actuated solenoids.
Valve supplied with impulse solenoid (ordering code 021 . . - . . 44) :
Valve closed:
Valve remains closed (mechanically locked).
Valve open:
Valve remains open.
A started movement will be completed.
