Finding the perfect valve can be an arduous exercise. Knowing your flow rate or CV value is often the first step in finding the right valve for your application. As a rule of thumb, needle, and metering valves are typically specified for proportional control of fluids. Full bore ball valves are more often used for ½ or ¼ applications. V port ball valves offers more flow control for you application. Let our experts help you find your perfect valve.
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Choosing the right valve requires determining the CV value, max flow, fluid pressure, temperature, media, corrosion resistance and line size. Other factors such as valve availability and cost are just as important. Once you have found your valve from catalogs or other resources, you need to check if it’s available at your budgeted time and cost. Below are the 4 steps to finding the perfect valve.
SG = Specific gravity of gas
p1 = Gas Inlet Pressure
p2 = Gas Outlet Pressure
T = Absolute Temperature
Q = Gas Flow Rate in SCFH
Q = Flow rate in GPM (US gallons)
G = Specific gravity of liquid
Dp = Pressure drop = inlet - outlet pressure(psi)
For the SS-18RM8 valve, the CV in the catalog text table is given as CV = 1.8.
This is the max CV on an open valve. If you want to find out your CV related to the number of turns open, you have to use the graph. the CV is approx. = 0.75 when the valve is open at 2 turns.
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