H147H, H247H, H347H cushioning check valves are suitable for high temperature liquid or gas pipelines. Installed at the outlet of the pump or fan, it has a quick cut-off of the line medium, prevents the medium from flowing backwards, and protects the pump or fan from damage. The check valve is mainly constructed of valve body, stem, disc, hydraulic buffer device, pneumatic actuator, transmission mechanism, pressure reducing device, electromagnetic reversing mechanism, circuit control system and other components. This function stop valve, the factory has two external structure for users to choose, in addition, according to user requirements to the mesh sample design and manufacturing.