May 19, 2002 #1 adavidi Mechanical Feb 14, 2001 40 What is the exact definition for CV valve? Is there a web site, which explain it? Thanks, Aharon
May 19, 2002 3 #2 TD2K Chemical Jan 11, 2002 2,629 Do you mean the definition for Cv with respect to a valve's capacity. The Cv is the number of US gallons of water the valve will pass with a differential pressure of 1 psi. The standard equation for a valve's capacity in liquid service is: Q = Cv(dP/SG)^0.5 This assumes there is no flashing or cavitation of the fluid. Q is the flowrate, gpm Cv is the valve Cv dP is the differential pressure, psi SG is the specific gravity of the fluid Upvote 0 Downvote
Do you mean the definition for Cv with respect to a valve's capacity. The Cv is the number of US gallons of water the valve will pass with a differential pressure of 1 psi. The standard equation for a valve's capacity in liquid service is: Q = Cv(dP/SG)^0.5 This assumes there is no flashing or cavitation of the fluid. Q is the flowrate, gpm Cv is the valve Cv dP is the differential pressure, psi SG is the specific gravity of the fluid
May 19, 2002 1 #3 Shahin71 Chemical May 14, 2002 26 You may have a look at this article http://www.cheresources.com/valvezz.shtml Regards Upvote 0 Downvote
May 30, 2002 1 #4 Lakeshore Mechanical Nov 7, 2001 18 The process of determining the Cv value of a valve is quite impoortant... temp. must remain constant, valve should be tested between 5-15 psid, etc. The Cv value is, to my belief, useless as a tool beyond a convenient number to compare valves. Check into ISA standards, ISA-S75.02. Take care Upvote 0 Downvote
The process of determining the Cv value of a valve is quite impoortant... temp. must remain constant, valve should be tested between 5-15 psid, etc. The Cv value is, to my belief, useless as a tool beyond a convenient number to compare valves. Check into ISA standards, ISA-S75.02. Take care
May 30, 2002 1 #5 MortenA Petroleum Aug 20, 2001 2,996 I think thats over the top Other values such as loss coefficeint may provide a more accurate tool but for most engineering purposes Cv will do all right. Best Regards Morten Upvote 0 Downvote
I think thats over the top Other values such as loss coefficeint may provide a more accurate tool but for most engineering purposes Cv will do all right. Best Regards Morten
