An operator tells you that a control valve in a stuck ? How will you start checking ?

An operator tells you that a control valve in a stuck ? How will you start checking ?
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1 Answer

Answer :

1. First of all get the control valve is passed from operation. 2. Check the lingual to the diaphragm of the control valve. 3. Disconnect it possible the actuator stem from the control valve stem. ٤. Stroke the actuator and see whether the actuator operates or not. It not then the diaphragm may be punctured. 5. If the actuator operates connect it back to the plug stem stroke the control valve. If it does not operate loosen the gland nuts a bit and see if it operates. If it does not then the control valve has to be removed from the line to w/shop. 
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