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Improving integrity between valve and actuator by using pressure safety valve on control panel of pneumatic actuators


One of the most important issues in the valve industry is the mechanical integrity between the valves and the actuators. Applied loads from the actuator that exceed the maximum load that can be tolerated by the valve stem pose a great risk to this integrity. This study develops a flowchart for ensuring the integrity between the valve and the actuator by adopting at least one of the following solutions: adding a pressure safety valve on the control panel of pneumatic actuators, reducing the spring torque of the actuators, and increasing the MAST by upgrading the material and/or increasing the stem diameter. Five actuated fail-safe closed ball valves were analyzed in terms of valve and actuator torques at five points and with air pressures of 5.5, 7, and 9 bar as well as the MAST. The MAST and integrity between the valve and the actuator did not pose problems in two cases; the use of at least one of the abovementioned solutions is proposed to ensure integrity between the valve and the actuator in terms of the MAST and actuator torque in the other three cases.

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Correspondence to Karan Sotoodeh.

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Sotoodeh, K. Improving integrity between valve and actuator by using pressure safety valve on control panel of pneumatic actuators. JMST Adv. 4, 13–24 (2022).

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  • Valve
  • Actuator
  • Pressure safety valve
  • Maximum allowable stem torque (MAST)
  • Actuator sizing
  • Safety factor
  • Offshore
  • Oil and gas industry