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There are now standardized calculations that are becoming accepted worldwide. Some product literature continues to demonstrate the traditional method, but the trend is to adopt the standardized method. Therefore, both methods are covered in this application guide.
- Valve Sizing Software
This is the home page for your valve software selections....
- Valve Sizing Software
U.S. gallons per minute of water at 60°F that will pass through a given flow restriction with a pressure drop of one psi. For example, a control valve that has a maximum flow coefficient, C V, of 12 has an effective port area in the full open position such that it passes 12 gpm of water with one psi pressure drop.
4 lis 2012 · For liquids the flow coefficient - C v-is expressed with water flow capacity in gallons per minute (GPM) of 60 o F with pressure drop 1 psi (lb/in 2). Flow expressed by volume C v = q (SG / dp) 1/2 (1)
through a given flow restriction with a pressure drop of one psi. For example, a control valve that has a maximum flow coefficient, C v, of 12 has an effective port area in the full open position such that it passes 12 gpm of water with one psi pressure drop. Basically, it is a capacity index upon which the engineer can rapidly and accurately
4 lis 2012 · Critical pressure ratios for water: Critical pressure ratios for liquids other than water: Gases - Critical Temperatures and Pressures.
Here are the very scientifically derived rules of thumb you should memorize: For ΔP valve siz-ing, use the higher of 5% of the total system pressure (i.e., static head plus pump head at maximum flow, boiler pressure, etc.), or 5 psi for rotary control valves, or 10 psi for globe valves.
1 sty 2014 · The flow coefficient, which describes the flow capacity of a valve, is an empirically determined constant equal to the valve's flow capacity in U.S. gallons per minute of water at 60 °F when a pressure drop of 1 psi exists across the valve in its most wide-open position.
