Normally Closed Gas Powered Stop Valves RACK Series

Technical parameters：

Nominal pressure: 2.8MPa         Applicable temperature:-50℃～+150℃

Test pressure: 4.2MPa                 Applicable medium:ammonia,fluorine,etc.

Characteristics:

- RACK are servo-operated valves normally closed and pneumaic open by

   means of refrigerant gas of high pressure acting upon power piston, 

   taken from external high pressure line through the external joint,

   AEVM-NC or NO fitted both on the valve bonnet.

- RACK valves are designed to work with ammonia and other common

  fluorinated refrigerants,for use insuction lines of low temperature in 

  direct expansion or pump recirculation, defrost systems with hot gas

  and any application that need a valve normally closed with automatic 

  opening for short time.

- RACK valves can operate with △p=0 and they must be installed in horizontal

  position, with the pistonand pilot working in vertical direction.

- When the valve are closed.there is a bleed of gas through a small bore,

  but only to close the valve when the hot gas stream is finished.

- The external joint of high pressure inlet, must be welded with the external  

   joint in size of 1/4" or 3/8".