Explain the operational aspects of limit switch and torque switch in rotork valve actuator.

Explain the operational aspects of limit switch and torque switch in rotork valve actuator. 
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1 Answer

Answer :

a. When limit function is selected? 

b. When torque function is selected? 

Limit function – when limit function is selected in rotork valve, the limit switches will operate when the limit set points are reached. Suppose limit switches fails to operate the torque switches will act and cuts off the supply to the motor (both torque switch and limit switches can act when selected to limit function). Torque function – when torque function is selected the torque switches will act when set point is reached. The limit switches will not act (only torque switch will act when selected to torque function). 
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