The relief valve ( 安全阀) To prevent the boilers, pressure vessels and other equipment or pipeline valve damage due to overpressure. When the fluid pressure is to protect the body reaches slightly higher than the normal operating pressure of a certain specified value ( The valve opening pressure) , the safety valve automatically opens, discharge of fluid, pressure drop. When pressure is down to just below the normal working pressure of a certain value ( The back pressure valve) , the safety valve automatically shut down, stop discharging fluid and keep sealed. The relief valve in different loading ways of the disc divided into two categories, heavy hammer type and spring type ( See [ The structure of the safety valve] ) 。 Heavy hammer and points directly heavy hammer and lever and weight. Direct and weight safety Industrial Valves is the first to use a safety Industrial Valves, only in a simple low voltage small devices ( Like a household pressure cooker) There are still used on. Lever and weight safety valve has simple structure, reliable load adjustment, can be used for low pressure stationary boiler, but because of the larger, sensitive to vibration and limitations used large faults, is rarely used in industry. Most widely used in industry is spring loaded safety valve. It can be designed to use of many kinds of structure to meet the various requirements, such as used in the large displacement, high pressure, high temperature, a back pressure, especially strict with seal, etc. ( The structure of the safety valve] For the structure is very simple a common spring safety valve. Relief valve by using the fluid phase state usually divided into two kinds: one kind is used for liquid, import and export of the same size, the opening of the disc height smaller; Another kind is used for steam and gas, export size greater than import size, the opening of the disc height is bigger, open very quickly. Relief valve can also be according to the opening of the disc height, discharge space conditions are classified. If the performance of the relief valve is not good, or improper selection, installation and debugging, will cause serious accident or economic losses. Therefore, must strictly abide by the rules and regulations of the relevant standards and safety supervision institutions. The relief valve should be locked or seal after adjusted, it is forbidden to unauthorized personnel.
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