Flow calculation flow calculations how to use flow coefficient how to use cv method flow coefficient (cv) is a numerical value that indicates the ability of a valve to pass a fluid. The larger the cv, the more fluid the valve can pass at a given pressure drop. The cv value of 1 means that when the pressure drop is 1 psi, the valve will flow 15 gallons of water per minute through the valve. A cv value of 350 means that the valve will flow 350 gallons per minute of 15 oc of water when the pressure drop is 1 psi. The greater the cv, the more flow a valve can pass with a given pressure drop. a cv of 1 means a valve will pass a gallon per minute (gpm ) of 60 of water with a pressure drop (dp) of 1 psi across the valve. a cv of 350 means a valve will pass 350 gpm of 60 of water with a dp of 1 psi. Where: dp = pressure drop in psi dp = pressure drop in psi f = flow rate in pounds per hour f = flow rate in lbs./hr. = Square root of specific volume, in cubic feet per pound (downstream of valve) = flow rate in gallons per minute (water or other liquid) flow rate gpm (water or other liquids) where: dp = pressure drop in psi dp = pressure drop in psi sg = specific gravity sg = specific gravity q = flow rate in gallons per minute q = flow rate in gpm Limitations Sexual limitations The formulas above are not valid under the following conditions: above formulas are not valid under the following conditions: For compressible fluids, the pressure drop exceeds one half of the inlet pressure. For compressible fluids, where pressure drop exceeds half the inlet pressure. For incompressible fluids, cavitation or flashing occurs if the pressure drop. For non-compressible fluids, where pressure drops causes cavitation or flashing. For biphasic fluids, such as steam-water fluid mixtures. Example example By dn350, pressure class class 900 pressure seal gate valve, the water temperature 400of, the pressure is 1500 psig, the flow rate of 5,000,000 pounds / hour pressure drop is what? What is the pressure drop through a 14 "class 900 pressure seal gate valve with 400of water, 1500 psig, .gunsq1 li {display: block; float: left; width: 200px; Pumps, sewage pumps [Buy] bearing accessories [Buy] air lock valve [Procurement] signal amplifier [Procurement] Valve [Procurement] Centrifugal Pump [Procurement] Vertical multi-stage pump [Procurement] Cylinder [Procurement] Speed ​​?? A: Centrifugal pump starts to close the outlet valve Next: How to specify and order the correct valve? 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