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What is direct and a reverse acting valve ?
The following clarified the different features between direct and reverse acting valve.
Direct acting valve
Air to close -- Spring to open --- Failed Open (FO)
(increasing air pressure pushes down diaphragm and extends actuator stem)
Reverse acting valve
Air to open -- Spring to close --- Failed Close (FC)
(increasing air pressure pushes up diaphragm and retracts actuator stem)
5 comments:
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Sol
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Is there any further reading you would recommend on this?
Amela
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