Cv Value Gas Valve

But the service that valve is for h2.

Cv value gas valve. So you need to check whether the calculated cv for the new fluid (gas) is more than the installed valve's cv (120). So when you say an installed cv of 120, it means the valve's cv is 120. I have found specifications for valves (internal) where the cv value of the valve is specified and the valve is almost exclusively used for gas application (dry nitrogen).

This is used as a guide and is not a linear progression. I know that cv = constant x kg cv [us gallons/min/psi] = 0,03445 kg [m³/h/bar] (related to natural gas, density = 0,83 kg/m³) ( by manufacture) note: The effective pressure drop across a gas control valve depends on the properties of the gas flowing through the valve and the valve design.

Q = valve flow rate in gallons per minute (us gpm) δp = difference between upstream and downstream pressure in The flow coefficient for a control valve which in full open position passes 25 gallons per minute of water with a one pound per square inch pressure drop can be calculated as:. If so, the valve needs either a modification or replacing, to meet.

By definition, a cv value of one is the cv required to Gallons per minute that passes through a valve at a pressure drop of 1 psi. It describes the relationship between the pressure drop across an orifice valve or other assembly and the corresponding flow rate.

However, this same cv value can be used to determine gas flows through a valve. It is commonly understood that nearly every pneumatic device creates a flow restriction in the system. Flow for a given cv is typically calculated from the following formula.

Each valve has its own flow coefficient. Is valid the same relation or the constant is different ??. Just follow the link on the table below.