Tuesday, September 23, 2008

Understand Reverse & Direct Acting Valves

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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:

Unknown said...
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Anonymous said...

i appreciate you spending some time and effort to put this article together.

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Unknown said...

I will keep your new article. I really enjoyed reading this post, thanks for sharing.

Sol
www.gofastek.com

Unknown said...

Is there any further reading you would recommend on this?

Amela
pneumatic valves

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