Gas Powered Stop Valves RAK-W Series

Technical parameters：

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

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

Characteristics:

- RAK-W are servo-operated valves normally open and pneumatic closed by means of refrigerant gas acting upon power piston,       taken from external high pressure line through a solenoid pilot AEVM type, mounted on the bonnet.

- RAK-W valves are designed to use with ammonia and other common fluorinated refrigerants,for use insuction lines or any application that need a valve normally open with automatic closing for short period.

- RAK-W valves can operate with △p=0 and in any position. But when the    

   valves are closed or open, there is a bleed of gas around the piston and    

   a small bore to allow open the valve when the high pressure gas stream     

   is closed. Nevertheless, if this small bleed cannot occur or you need a        

   valve without bleed around the piston,you must use our RACK normally

   closed valve,or the option RAK-2WS type,but with this last type you need

   to include two solenoid pilots, one to shut off the hot gas inlet flow, and 

   the second one to empty the chamber over the piston, and to avoid open 

   the valve again.

- The inlet of hot gas to solenoid pilot is through a nut & nipple connection 

   of 1/4" or 3/8"brazed or welded to nipple.