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Supriya Prototech


Double Acting Pneumatic Fail Safe Actuator (WC-DAFS)

Supriya Prototech
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Double Acting Pneumatic Fail Safe Actuator (WC-DAFS)

Double Acting Air Fail Safe System is an alternative to Spring Return Actuators. Supriya DAFS actuators are highly engineered, proven and reliable solution for large size rotary and linear valves with high valve thrust requirement.


TYPES


Introduction:  
Type – Standard
Double Acting Air Fail Safe (DAFS) System are also referred as Air-Spring Fail Safe Systems. Double Acting Pneumatic Actuator with Air Vessel / Volume Tank is connected with the customized pneumatic automation circuit to achieve Fail Safe Operation of Valve. Actuator can be configured to operate Fail Safe position as ‘Air Fail to Close’ or ‘Air Fail to Open’. The actuators operate as a double acting under regular operation whereas; source air failure drives the actuator piston in the direction of failsafe position.  


Type – Boosted
Double Acting Pneumatic Cylinder, Series WC, is also available under special high pressure operating requirements. High pressure cylinder will be coupled with high pressure air vessel to operate the valve and also achieve fail safe operation. High pressure can be charged in air vessel by source air; In case source air pressure is a restriction then Pressure Booster with integrated automation circuit will be provided. For example, input supply of 5bar can be elevated to 10bar or 15bar based on requirement. Significant reduction in size of actuator, volume tank and hence its weight can be achieved through this integration. Thereby, overall highly efficient compact air actuated fail safe system can be coupled to valve.
 

SPECIFICATIONS


Type Double Acting Fail Safe Actuator with Air Tank – Linear
Series WC-DAFS 
Type  Double Acting Scotch Yoke Actuator with Air Tank - Rotary 
Series SY-DAFS 
Maximum Operating Pressure 7bar 
Temperature Range minus (-)10°C to +80°C
Control Type Throttling(Control Duty), On-Off Duty

 

FEATURES


Operational Features

  • Air Vessel/Volume Tank sizing is done so as to operate minimum number of cycles as per customer requirement. 
  • Air is charged into the vessel against a Non Return Valve which holds the pressure under source failure. Air from the vessel will be routed through shuttle valve, pilot valve, solenoid valve and /or positioner to achieve the intended operation. 
  • Pneumatic Actuator and Air vessel integration is available with CE approval under directive PED 2014/68/EU. Air vessel is designed and tested as per ASME Sec VIII and manufactured as per Sec IX.
  • Control Circuit is built in an enclosure conforming to protection class as per site environmental conditions. 
  • Different customized logic circuits are built to meet site specific process control requirements.