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Pressure reducing valve classification and role
There are three types of pressure reducing valve: Acting pressure reducing valve. The simplest pressure reducing valve, direct acting pressure reducing valve with flat diaphragm or bellows. Because the pressure relief valve is a separate structure, there is no need to install an external sense line downstream. Pressure reducing valve is the smallest of the three pressure reducing valve, the most economical one, designed for low flow design. The accuracy of the direct acting pressure reducing valve is typically +/- 10% of the downstream set point. Film pressure reducing valve. In this type of pressure relief valve, the double diaphragm replaces the piston in the internal pressure relief valve. Pressure Reducing Valve This increased diaphragm area opens a larger main valve and has greater capacity than the internal pilot pressure reducing valve for the same pipe size. In addition, the pressure reducing diaphragm is more sensitive to pressure changes with an accuracy of +/- 1%. The higher accuracy is due to the positioning of the downstream sensing line (outside the valve) where turbulence of gas or liquid is less. The pressure reducing valve is very flexible and can be used with different types of pressure reducing valve pilot valves (eg pressure valves, temperature valves, air-loading valves, solenoid valves or several valves). Piston pressure reducing valve. This type of pressure reducing valve combines two types of pilot valve with main valve. The design of the pilot valve is similar to the direct-acting relief valve. The exhaust pressure from the pilot valve acts on the piston, causing the piston to open the main valve. If the main valve is large and can not be opened directly, this design will use the inlet pressure to open the main valve. As a result, this type of pressure relief valve offers higher capacity and accuracy (+/- 5%) at the same pipe size than direct-acting relief valves. As with the direct acting pressure reducing valve, pressure relief valves sense the pressure inside, eliminating the need for external sensing lines.