We're professional flap check valve manufacturers and suppliers in China, with more than 30 years' experience. Welcome to wholesale high quality flap check valve at the best price from our factory.The flap check valve refers to a valve that automatically opens and closes by means of the flow of the medium itself, and is used to prevent the back flow of the medium, which is also called a check valve, a check valve, a reverse flow valve, and a back pressure valve.Our product flap check valve can prevent the medium from flowing backward, prevent the pump and the drive motor from reversing, and releasing the container medium.