The working principle of the safety valve

by:AIRWOLF     2020-05-16
Safety valve is a pressure vessel, boiler, pressure piping system using a wide range of pressure of a safety device, guarantee the safe operation of the pressure system. Safety valve is to prevent pressure equipment and containers, easy cause pressure or internal pressure exceeds limit and burst safety device. When tank pressure exceeds design rules, safety valve automatically open, discharge gas lower in high pressure, prevents damage to the container or pipe. And when the pressure inside the container drop to normal operating pressure, which shut down automatically to avoid the container overpressure discharge gas, resulting in the waste and production disruptions. Safety valve is mainly composed of valve seat and valve disc ( The valve core) And the loading mechanism of three parts. Some valve seat and valve body as a whole, have a plenty of and the valve body assembly together, it is connected with the device. Valve disc often joint with the valve rod, it closely on the valve seat. The size of the valve disc is above loading mechanism, load can be adjusted. When the pressure inside the equipment in the range of certain work pressure, internal force acting on the valve disc above medium is less than the load mechanism and force at the top of the valve, the difference between the two composition between the valve disc and valve seat sealing force, make the valve disc compression, the valve seat, equipment of medium can't discharge. When the pressure inside the equipment in excess of the prescribed work pressure and achieve safety valve opening pressure, internal media role in alarm valve is greater than the force loading mechanism exert force on it, then left the valve seat valve disc, safety valve opens, the equipment within the medium through the valve seat, if the safety valve of the displacement is greater than the equipment safety discharge capacity, equipment internal pressure is gradually decline, and through the vent after a short period of time, pressure drop back to normal working pressure. The internal pressure acting on the valve disc and load mechanism is less than the force applied on it, the valve disc and press the valve seat, medium to stop discharging, maintain the normal working pressure to continue running. So, the safety valve by valve disc on the ebb and flow of medium force and loading force, to close or open to achieve the purpose of preventing equipment overpressure.
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