Pressure relief valve is to prevent equipment and vessels or containers can lead to increased pressure or internal pressure exceeds the limits of the burst of the safety device. Safety valve is a pressure system of pressure vessel, boiler, pressure pipe, use a wide range of safety devices, ensure the safe operation of pressure systems.
When the tank pressure exceeds the design requirements, the valve automatically opens, exhaust gas pressure reduction over inside, to prevent the vessel or pipeline damage. When the pressure inside the container to the normal operating pressure, container is automatically turned off to avoid over-pressure exhaust all the gas, resulting in waste and production interruption.
Safety valve mainly comprises a valve seat, the valve (valve) and a loading mechanism is composed of three parts. Some of the valve seat and valve body as a whole, there is and the valve assembly together, it is connected with the equipment. Often associated with valve stem, it is closely linked to the seat. The above is a disc loading mechanism, load size can be adjusted. When the equipment inside the pressure within the pressure range of certain time, internal medium acting on the valve flap is less than the force above the loading body force added to the valve above, the difference is formed between the valve and valve seat sealing force, squeeze the valve seat so, the media can not be discharged. When the equipment inside the pressure exceeds the pressure of work and achieve the safety valve opening pressure, the internal medium acting on the valve above the force is greater than the loading mechanism exerts a force on it, then leave the seat valve, safety valve opens, the equipment medium discharged through the valve seat, if the safety valve emissions than the equipment the safety discharge equipment, pressure is gradually decreased, and the exhaust through a short time, the pressure is reduced back to normal working pressure. The pressure acting on the valve flap above the force is less than the loading mechanism exerts a force on it, then pressed the valve seat, the media to stop the discharge, equipment to maintain the normal operating pressure continues to run. Therefore, the safety valve is the valve flap on the ebb and flow of medium body force and loading force, or turn itself off in order to achieve the purpose of preventing over-pressure device.
Set the safety valve should pay attention to the following points:
(1) container with gas, liquid two-phase material safety valve should be installed in the gas phase.
(2) flammable liquid safety valve for discharge, the safety valve outlet should be connected with the accident tank. When the discharge is high-temperature combustible materials, the receiving container should have the appropriate protection facilities.
(3) the general safety valve may vent, emptying port operators should be higher than 1 meters and should not be more than 15 meters towards the within the fire location, location and distribution of high-temperature equipment sparks. Indoor equipment, safety valve for emptying the container mouth should lead to the roof, and more than 2 meters above the roof.
(4) when the safety valve entrance cut off valve, isolation valve should be in a normally open state, and to be sealed, to avoid mistakes.
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