Pressure relief valve function and classification

Posted by uuuseff on November 19th, 2019

First, the function of relief valve: constant pressure overflow effect: In the metering pump throttling regulation system, the dosing pump provides a constant flow. When the system pressure increases, will reduce the demand for traffic. At this point, the relief valve is opened to allow excess flow to overflow into the fuel tank to ensure that the relief valve inlet pressure is constant, ie the pressure at the pump outlet is constant (the valve port often opens with pressure fluctuations). Overflow valve diagram Safety protection: The valve is closed when the system is working normally. Only when the load exceeds the specified limit (the system pressure exceeds the set pressure), the overflow will be opened and over load protection will be implemented to prevent the system pressure from increasing (usually, the setting pressure of the relief valve is 10% ~ 20% higher than the maximum working pressure of the system. ). 1, for unloading valve; 2, for remote pressure regulating valve; 3, for high and low pressure multi-stage control valve; 4, for the sequence valve; 5, used to generate back pressure (string in the return line). Second, the classification of relief valve: 1, direct acting relief valve: (1), cone valve direct acting relief valve (2), ball valve direct acting relief valve 2, pilot relief valve Main valve and pilot valve composed of two parts. Pilot valve similar to the direct acting relief valve, but usually cone valve (or ball valve) shaped seat structure. The main valve can be divided into a concentric structure, two concentric structure and three concentric structure.

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