There are three types of relief valve:
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Actuated pressure reducing valve. Zui simple pressure reducing valve, direct acting pressure reducing valve with flat diaphragm or bellows. Because it is a stand-alone structure, there is no need to install an external sense line downstream. It is one of the three types of pressure reducing valves with a small volume and a ziu economy. It is designed for medium and low flow. The accuracy of the direct acting pressure reducing valve is typically +/- 10% of the downstream set point.
Piston pressure reducing valve. This type of pressure reducing valve integrates two types of valves - pilot valve and main valve - in one. The design of the pilot valve is similar to that of a direct acting pressure reducing valve. Exhaust pressure from the pilot valve acts on the piston causing the piston to open the main valve. This design uses the inlet pressure to open the main valve if the main valve is large and cannot be opened directly. Therefore, this type of pressure reducing valve has a higher capacity and accuracy (+/- 5%) at the same pipe size compared to a direct acting pressure reducing valve. The same as the direct-acting pressure reducing valve, the pressure inside the pressure reducing valve senses that there is no need to externally install the sensing wire.
Membrane pressure reducing valve. In this type of pressure reducing valve, the double diaphragm replaces the piston in the internal pressure reducing valve. This increased diaphragm area enables the opening of a larger main valve and, at the same pipe size, has a larger capacity than the internal pilot piston relief valve. 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 (the outside of the valve), where the gas or liquid is less turbulent. The pressure relief valve is very flexible and can be used with different types of pilot valves (eg pressure valves, temperature valves, air load valves, solenoid valves or several valves).