Relief Industrial Valves to improve operating reliability, the development of the high performance valve relief Industrial Valves action reliability is directly related to the equipment and personal safety, the stand or fall of its performance is also related to energy saving and operation economy of the unit. For special applications such as the thermal power and nuclear power generation, more is of great significance. Modern large capacity of the relief valve, the discharge coefficient has almost reached the limit, For example some American manufacturers released by the displacement coefficient of 0. 975). 。 And manufacturers to improve focus on the performance of the relief valve opening and closing action such as reliability and sealing performance, from the structure design, manufacturing process and experimental study on the measures to develop high performance valve. Cases the action reliability of safety valve is directly related to equipment and the people, and make great efforts to improve the stability of the opening pressure improve the manufacturing quality of key-module spring, the spring is compressed geometric accuracy of the determination of stress migration test, etc. To improve the back pressure of the regulatory and set up multiple adjusting mechanism. In order to improve the sealing performance under high temperature and pressure developed flexible disc, such as thermal disc special seal structure, etc. At the same time, the valve factory is generally carried out safety valve performance test, some still has carried out the disc lift test, vibration test, seismic experiment, such as developmental test and research work, effectively promoted the improvement of the performance of the relief valve. Safety valve and the pilot operated relief valve spring directly load at the same time, the development in the modern industry, heavy hammer, the lever and weight safety valve size is limited, due to its load is sensitive to vibration and the causes of the low back pressure, its use scope has become more and more small. And the spring load safety valve and pilot operated relief valve directly because of cannot replace each other their own characteristics, both at the same time. Spring load directly safety valve has the structure is simple, quick, good reliability, etc. But by relying on the spring loaded, its load size is restricted, and therefore cannot be used in high pressure and large diameter of the occasion. In addition, when the normal operation of protection system, the safety valve shut down a specific pressure on the surface of the sealing depends on the valve set pressure with the difference between the normal operation of system pressure, is a small value, so difficult to achieve good sealing. Especially when the valve is closed for the metal seal face and when the valve setting pressure when compared to normal operation of system pressure close to even more so. At this time in order to guarantee the required sealing often requires special structure type and fine machining and assembly.

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