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The main parameters of the safety valve displacement, the displacement of the valve seat depends on the caliber and the valve opening height, the opening height is different, is divided into two kinds of micro-Kai and full Kai. Micro-Kai refers to the valve opening height of the valve seat throat diameter 1/40 ~ l / 20. Throttle refers to the valve opening height of the valve seat throat diameter 1/4. Currently a large number of production safety valve spring and rod two categories. There are also impulse-type hydraulic valve, pilot-operated safety valve, safety switch valve, safety relief valve, static heavy-duty safety valve. Spring-loaded safety valve depends mainly on the force of the spring to work, spring-loaded safety valve has closed and not closed, the general flammable, explosive or toxic media should be used closed, steam or inert gas can choose not closed Type, in the spring-loaded safety valve with wrench and without wrench. The role of the wrench is to check the valve flap flexibility, and sometimes can also be used as a manual emergency relief pressure, lever safety valve rely mainly on the leverage of the hammer work, but the large size of the lever safety valve often limits the choice of range. When the temperature is high, select the safety valve with a radiator. The selection of safety valve is determined by the operating pressure of the nominal pressure of the safety valve, the operating temperature of the safety valve to determine the temperature range, the calculated value of the safety valve determines the fixed pressure spring or lever range, and then use the media to determine the safety Valve material and structure type, and then calculated according to safety valve relief valve throat diameter. The following is the general rules for the selection of hydraulic safety valve. Working principle and structure: Safety valve in the system from the safety protection. When the system pressure exceeds the specified value, the safety valve Ting open, the system part of the gas into the atmosphere, the system pressure does not exceed the allowable value, so as to ensure that the system is not over pressure and accidents. Safety valve, also known as relief valve. The figure shows several typical safety valve structure. Figure a piston-type safety valve, spool is a flat. When the pressure exceeds the safety value determined by the spring force, the piston A is pushed open and part of the compressed air is discharged into the atmosphere from the valve port. When the pressure of the air source is lower than the safety value, the spring is driven Pistons down, close the valve port.