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cg or cv of varies valves

cg or cv of varies valves

cg or cv of varies valves

(OP)
Hello all,

Is there any reference giving me an approximate values for valves cg or cv when working in gasaes (scfh / psi) according to valve type (ball, plug, globe,..) and valve flanges NPS.

thank you

RE: cg or cv of varies valves

Its easy enough for control valves - but for block valves most vendor wont give you a value - there are some rules of thumbs out there - also some that was discussed recently (try to search yourself).
Best regards, Morten

RE: cg or cv of varies valves

There is a table in the GPSA - control valves section which has the data you are looking for. For block valves, a google search will help.

RE: cg or cv of varies valves

Remember that the definition of Cv is in how many USGPM of water flow through the valve at a pressure drop of 1 psi. So, with a knowledge of equivalent length or K resistance value of any valve, you should be able to derive whatever Cv you need.

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