The classification of pressure relief valve Introducing the role of pressure reducing valve, the most simple pressure reducing valve, direct acting pressure reducing valve, with a flat diaphragm or bellows. Because it is a standalone structure, there is no need to install external sense wires downstream. It is the smallest of the three pressure reducing valves, the most economical one, designed for low and medium flow. The accuracy of the direct acting pressure reducing valve is typically +/- 10% of the downstream set point. Piston Pressure Reducing Valves: This type of pressure relief valve combines two types of valves - pilot and main valve - in one. The design of the pilot valve is similar to the direct-acting relief valve. 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. Membrane Pressure Reducing Valve: In this type of pressure reducing valve, the double diaphragm replaces the piston in the internal pressure relief valve. This increased diaphragm area opens a larger main valve and has greater capacity than the internal pilot piston relief valve for the same pipe size. In addition, the 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 pilot valves (eg pressure valves, temperature valves, air-loading valves, solenoid valves or several valves).
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