Safety valve is boiler, pressure vessel, pressure pipe and other pressure equipment protection device. It is very important to understand the working principle and operation specification of safety valve. In the view of Shanghai high pressure valve: safety valve is the direct force produced by the medium pressure to overcome the mechanical load on the valve flap to open the safety valve, the mechanical load on the valve flap mainly from weight or spring, which is almost constant mechanical load. In order to ensure the sealing performance of the safety valve, the valve seat sealing surface and the valve seal surface smoothness and surface roughness must be strictly required.
Working principle of safety valve:
Take the spring safety valve as an example: the working principle is the pressure = pressure X area. Pressure is the pressure of spring, the area is the area of the sealing surface. When the pressure acting on the sealing surface is multiplied by the area of the sealing surface, the upward thrust is greater than the pressure of the spring, the spring is compressed, the sealing surface is opened, and the pressure is discharged through the pressure relief hole.
When the equipment inside the pressure exceeds the pressure of work and achieve the safety valve opening pressure, the internal medium acting on the flap above downtown the force is greater than the loading mechanism applied on top of it, then leave the seat valve, safety valve opens, equipment in the medium is discharged through the valve seat. The force acting on the valve clack is less than the force exerted on it by the loading mechanism, and the valve tightly presses the valve seat, the medium stops discharging, and the equipment keeps the normal working pressure and continues to run. Therefore, the safety valve is through the valve on the medium force and the force of the loading and unloading mechanism of growth and decline, self closing or opening, in order to achieve the purpose of preventing equipment overpressure.
When the safety valve set pressure is greater than the protection system of the working pressure, the valve is in the closed state, the role of the force on the valve spring preload F, downward direction, medium force, direction, and is the seat of the valve (sealing force), uplift forces the sealing force in the sealing surface than the pressure generated, ensuring the safety valve closure with the required sealing.
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