1. From the appearance: the check valve does not have the handle tightly, and the stop valve has a handle.
2. From the point of view of use: check valve is a valve used to stop liquid backflow, and stop valve is a valve used to cut off liquid feed in the pipeline.
3. In principle: the check valve is an automatic valve, and the stop valve is a valve that requires manual or motorized pressure. Check valve refers to a valve whose opening and closing parts are circular discs and rely on its own weight and medium pressure to generate actions to block the back flow of the medium. It is an automatic valve. The shut-off valve, also called the shut-off valve, is a forced-sealing valve. When the valve is closed, it must be closed by applying pressure to the disc by the external force of the handle to forcibly shut off the liquid feed.
