Does Valve Cv Have Units

The pressure drop or flow rate through a valve or orifice plate is typically calculated using the a flow coefficient, cv or orifice diameter. Thus a cv flow coefficient of 10 indicates that a 1.0 psi pressure drop will occur with a 10 us gpm of water throughput through the valve. So how can i apply cv in us gallons to flow in line as per h & mb in m3.

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If the metric cv is given in units of the number of liters per minute of water which will pass through an orifice at a pressure drop of 1 newton per sq meter (pascal), it may be converted to u.s.

Does valve cv have units. A simplified version of the definition is: It is a linear motion valve used to start or stop fluid flow. Cv is determined by the manufacturer of the valve and can be found on the valve manufacturer's website and/or related valve data and specification sheets.

Flow for a given cv is typically calculated from the following formula. This is the basic equation for cv, where q is the rate of flow (gallons per minute), sg is the specific gravity of the fluid, and p is the pressure drop across the valve (psi). What is the cv of a valve?

Valve starts to shift but does not complete reversal action. Cv for fluids cv for liquids is the volume of 68°f water in u.s. Think of a full port ball valve as a piece of pipe of the same lay length as the valve.

The k v factor of a valve indicates the water flow in m 3 /h, at a pressure drop across the valve of 1 kgf /cm 2 when the valve is completely open. Approximate flow capacity can be determined for valves by using the given cv factor for a valve and applying them to the following formulae’s. What can have a bearing on the value is the interior shape of the flow passage and valve length.

For any specific valve opening with an equivalent pressure drop and equivalent temperature, by applying multiplication factor we get equal flows in both imperial and metric units. 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. Also density in diff units other than cv specified in valve datasheet , then sometimes cv in us units.

(at 15 °c) with a delta p of 1 bar across the valve. Therefore, it is important that engineers have a solid understanding of the available data to prevent components from being oversized or undersized in pneumatic systems. Cv is the flow coefficient in imperial units.