The body of the composite exhaust valve is ellipsoid drum-shaped, and the internal components include a stainless steel float ball, lever, and valve disc. The composite exhaust valve is generally installed at the pump outlet or in the distribution pipeline to expel air accumulated in the pipes, enhancing the efficiency of the pipeline and non-pumped use. When a vacuum is formed inside the pipe, the composite exhaust valve can quickly吸入 (suck in) external air to prevent the pipeline from being damaged due to vacuum. The applicable medium temperature for the composite exhaust valve is 0~80℃.