A high-temperature and high-pressure bellows ball valve structure

Abstract

This utility model provides a high-temperature and high-pressure bellows ball valve structure, including: a valve body, a ball core, a valve stem, and a bellows valve seat assembly. The bellows valve seat assembly includes a valve seat body and a metal bellows, which connects the valve body and the valve seat body. The bellows valve seat assembly has a medium through hole, which is coaxially opened with the medium flow channel. Dynamic sealing is achieved through the axial elastic deformation of the metal bellows. When the medium pressure or temperature changes, the bellows can automatically compensate for the wear or displacement of the sealing surface of the valve seat body, maintaining a stable sealing specific pressure. Furthermore, due to the excellent high-temperature resistance, corrosion resistance, and fatigue resistance of the metal bellows, it will not deteriorate or fail due to burn-out at ≥450℃, solving the leakage problem caused by the high burn-out rate of graphite at high temperatures. The separate design of the metal bellows and the valve seat body in this application effectively reduces the processing difficulty and cost of the components.

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