The pneumatic valve, pneumatic valve with the valve of the compressed air-driven pneumatic actuators, valve closed, the sealing surface can only rely on media pressure to seal rely on media pressure pneumatic Gate Valve gate sealing surface pressure to the other side of the seat to ensure the sealing surface of the seal, which is self-sealing. Most of the valve is sealed by force, the valve is closed, we have to rely on external force to the ram pressure to the valve seat to ensure that the sealing surface of the seal.

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