H42 vertical check valve is designed and manufactured in strict accordance with API6D and GB/T12235 standards, this series of valves is normally closed, and the valve is opened due to the pressure of the inlet medium in the pipeline. When the medium pressure at the inlet end is lower than that at the outlet end, the spring pushes the valve core to the valve seat and closes the valve, preventing the medium from flowing backwards, so it plays a non-return role. Due to the spring-supported spool, the H42N vertical check valve can be installed vertically or horizontally. It is widely used in pipelines under various working conditions such as petroleum, chemical, pharmaceutical, and power industries.