How to Calculate Temperature Drop Across Gas Valve


The pressure acting on a gas valve, combined with the gas's rate of flow, produces an energy differential across it. When no mechanical work occurs at the valve, this energy change manifests as a change in temperature. A high temperature drop can reduce a system's efficiency. Methods for reducing the temperature change across a valve include installing additional, separate pressure release valves and adding area from which heat can dissipate.

  • Multiply the volumetric flow rate past the valve by the pressure acting upon it. If, for instance 0.02 gallons flow per minute at 300 pounds per square inch of pressure: 0.2 x 300 = 6.

  • Divide your result by 1,714, which is a set conversion value: 6 / 1,714 = 0.0035. This represents the rate of energy change across the valve, measured in horsepower.

  • Multiply your answer by 1,000, another set conversion value: 0.0035 x 1,000 = 3.5.

  • Divide the result by the surface area of the valve. If the valve offers a surface area of 2.3 square feet: 3.5 / 2.3 = 1.52 degrees Fahrenheit. This answer is the temperature drop across the valve.

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