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The zero-leakage metal bellows dynamic sealing technology is not only the key technology of liquid rocket engine valves, but also the key technology of valves used in various industries (aerospace, aviation, ships, petroleum and chemical industry, etc.).Especially for valves used in low temperature, high temperature, high pressure, toxic and corrosive media, ensuring zero leakage in the valve switching adjustment action is the difficulty point in and key to valve development, design and use，as well as the difficulty point in and key to ensuring the safe and reliable operation of aerospace liquid rocket engine systems, aviation, ships, petroleum and chemical media transportation systems.
The dynamic sealing of metal bellows in the valve is realized by the metal bellows assembly. Metal bellows assemblies are generally composed of metal bellows, flange connectors and cover connectors. The metal bellows relies on the strength and elasticity of the elastic sheet material of the bellows to stretch or compress when it moves with the valve disc in the metal bellows assembly, to block the leakage between the air control cavity and the medium cavity, and to provide a zero leakage dynamic seal It also bears the effect of the pressure difference between the medium cavity and the air control cavity.
The most common form of bellows is the multi-layer U-shaped metal bellows. The metal bellows assembly is integrated with the valve housing through the flange connection. The cover connector is directly or indirectly connected with the valve disc, and is driven by air control or medium pressure to make the valve disc move to open, close and adjust. Three metal parts are welded by manual or automatic argon arc welding, electron beam welding and soldering welding, etc.
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The dynamic sealing of metal bellows in the valve is realized by the metal bellows assembly. Metal bellows assemblies are generally composed of metal bellows, flange connectors and cover connectors. The metal bellows relies on the strength and elasticity of the elastic sheet material of the bellows to stretch or compress when it moves with the valve disc in the metal bellows assembly, to block the leakage between the air control cavity and the medium cavity, and to provide a zero leakage dynamic seal It also bears the effect of the pressure difference between the medium cavity and the air control cavity.
The most common form of bellows is the multi-layer U-shaped metal bellows. The metal bellows assembly is integrated with the valve housing through the flange connection. The cover connector is directly or indirectly connected with the valve disc, and is driven by air control or medium pressure to make the valve disc move to open, close and adjust. Three metal parts are welded by manual or automatic argon arc welding, electron beam welding and soldering welding, etc.
