Control Valve Cv Si Units
Q = valve flow rate in gallons per minute (us gpm) δp = difference between upstream and downstream pressure in
Control valve cv si units. C v & flow calculator. Cv is the flow coefficient in imperial units. The flow of water through a valve at 60 o f in us gallon/minute at a pressure drop of 1 lb/in 2
Liquid pressure recovery factor for a control valve without attached fittings dimensionless f lp. In si units, the flow coefficient is called kv and it is defined as the flow rate (m 3 /h) that gives a pressure drop of 1 bar for water at 16°c. For measuring the valve capacity of control valves, the coefficient cv or its metric equivalent kv is adopted.
In imperial units, the coefficient is called cv, defined as the flow rate (gpm) that gives a pressure drop of 1 psi for water at 60°f. Equations displayed for easy reference. If the flow coefficient is given in si units, it may be converted to u.s.
Flow for a given cv is typically calculated from the following formula. Calculate required control valve capacity (cv or kv) for minimum, normal, maximum and one additional flow condition. Such as the renault number (reynolds number), flow rate (flow), the shock (choking), the involved joints in pipes (fitting) and the other by the values of these.
The valve flow coefficient cv or its metric equivalent kv has been adopted universally as a comparative value for measuring the capacity of control valves. This is our valve c v calculator. When sizing a control valve, the most common approach is to calculate the flow coefficient, cv which is a measure of the capacity of the valve body and trim.
A valve cv can be described as the number of gallons per minute (gpm) at 60 o f (15.5 o c) that will pass through a valve with an associated pressure drop of 1 psi. Gallons per minute of water at 60°f that will flow through a control valve at a specified opening when a pressure differential of 1psi. Engineering units are by default set to us units, but can be easily changed to si units.
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