Water Control Valves - flow coefficient C v diagram. The Cv was designed for use with liquid flows it expresses the flow in gallons per minute of 60ยบ F water with a pressure drop across the valve of 1 psi.
The flow coefficient is commonly used in the US.
Flow coefficient cv for gases.
The flow of water through a valve at 60 o F in US gallonminute at a pressure drop of 1 lbin 2.
When the fluid flows from right to left and the fluid pressure is greater than the cracking pressures the spool moves off of its seat and opens the valve.
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Flow Calculation for Gases The coefficient of flow Cv is a formula which is used to determine a valves flows under various conditions and to select the correct valve for a flow application.
The flow coefficient - C v - is based on the imperial units system and is defined as.
Check valves Figure 229 are two-port valvesone for fluid to enter and the other for fluid to leaveNormally the check valve closes under the action of the spring force on the left.
Flow Coefficient - C v.
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