RALK Pneumatic stop valve

Nominal pressure: 2.8MPa
Applicable temperature:-50℃ ~ +120c
Test pressure:4.2MPa
Applicable medium: ammonia,fluorine, propane,propylene, etc.

Characteristics

• RALK are servo-operated valves normally closed and pneumatic opening by means of refrigerant gas from external high pressure line.acting upon power piston.
• On the bonnet are fitted one External interface, nut & nipple connection to gas inlet , and two solenoid pilots AEVM type according to these two options:
  a-RALK-NC/NO . with one AEVM-NC. (normally closed pilot) on A.and one AEVM-NO. (normally open pilot)on B
  b-RALK-NC/NO . with one AEVM-NC (normally closed pilot) on A.and one AEVM-NC.on B.
• RALK valves are designed to use with ammonia and other common fluorinated refrigerants. for use in suction lines or any application that need a valve normally closed with automatic opening for brief periods,and with a minimum differential pressure between inlet-outlet or inclusively with Δp=O.
• While the valves are opened , there is not a bleed of gas around the piston, and only when the solenoid A Shut off the flow of gas upon power piston and the solenoid B is open to allow close again the main valve. the gas of this camera is relieved upstream