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difference between XV and SDV valves

difference between XV and SDV valves

(OP)
Hello,
I would like to know the difference between XV and SDV valves

i apericiate any help

RE: difference between XV and SDV valves

Typically XV is a simple on off actuated valve which fails in position on loss of power or signal.

SDV is a shutdown valve which typically fails closed on loss of signal our power by using stored energy, normally a BIG spring.

The difference should be shown in your standard p & id drawings

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

RE: difference between XV and SDV valves

(OP)
Thanks for your answer

RE: difference between XV and SDV valves

a shutdown valve is sometimes referred as XXV

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