Two Steps Gas Powered Stop Valves RAXK Series

Technical parameters：

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

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

Characteristics:

- RAXK are two steps servo-operated valves normally closed and pneumatic opening by means of refrigerant gas from external 

   high pressure acting upon power piston, 

   The working principle is:1-Step one the valve opens 10% of the total when the coils of the pilots are powered.

    2-Step two the valve opens automatically 100% when the differential pressure across the valve reaches 1-1.5 bar.

- AEVM-NO As the RAXK valves On the bonnet of the RAXK are fitted one 

   external joint, nut & nipple connection to gas inlet, and two solenoid pilot 

   AEVM type, one AEVM-NC, (nomally closed pilot) on A, and one AEVM-NO, 

   (normally open pilot)on B.

- The solenoid valve A shut-off and open the flow of gas to the top piston 

   chamber, to close or open the main valve. But the solenoid valve B has 

   to be opened to relieve this gas of the chamber to allow closed again 

   the main valve when the pilot A is closed.

- RAXK valves are designed to use with ammonia and other common

   fluorinated refrigerants, for use insuction lines opening against very

   high differential pressure and for any application that need automatical

   shut-off valve to working with an external line pressure equal or less 

   than inlet pressure of the valve.