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TOPIC: Which Valve First

10 years 6 months ago #7537

  • ashokaa
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Dear All

Which valve comes first, Globe valve or Ball Valve In Control Valve Bypass line, Normally i used to locate Globe valve first,
But i forgot the reasion why i used, Please Advise me.

Re: Which Valve First 10 years 6 months ago #5090

  • Crashtested
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Globe in, gate out is what I was taught.
Reality is a trigger word and we're quickly losing touch...

Re: Which Valve First 10 years 6 months ago #5091

  • Jop
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I do not remember ever seeing a control valve bypass with two valves.

In my experience 99% of all CV bypasses had one Globe valve to throttle the flow when the CV was out for maintenance or repair.
The 1% of the time was when we had a bypass that was larger than the available globe size so we used a Gate valve.

Why are you putting two valves in the CV bypass?
Does the P&ID show two valves in the CV bypass?
Do it once and Do it Right

Re: Which Valve First 10 years 6 months ago #5092

  • ashokaa
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Thanks Crashtested and Jop,

Jop,
yes the P&ID shows two (globe and ball ) valves, i used many times in the Piping, I noted the in my note book that globe vale will comes first, but i forgot the reasion,

Re: Which Valve First 10 years 6 months ago #5093

  • Jop
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ashokaa,
You say that the P&ID shows two valves in the CV bypass.
Ok, which valve is shown first (in flow direction)?
Now since the Process Engineer is responsible for developing the P&ID, please go ask him (or her) the following:
Why two valves?
Why "that" one first?
Because I for one would like to know the answer to both of these questions..
Do it once and Do it Right

Re: Which Valve First 10 years 6 months ago #5102

  • ashokaa
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Ok jop,

i will check and come back to you,
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