When the container pressure exceeds the design requirements, the Safety valve automatically opens, the escaping gas reduces internal over pressure, to prevent the container or pipeline damage. And when the internal pressure reduces to normal operating pressure, the container automatically shuts down to avoid over-pressure exhaust all the gas, lead to waste and production suspension. It is mainly composed by the seat, disc (valve core) and the loading mechanism. Some seats are as a whole with body, some, some are assemblied with body together, and connected with the device. The disc is often associated with stem, it is closely linked on the seat.

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