This type of valve is used to prevent media backflow, utilizing the kinetic energy of the fluid itself to open and automatically close when flowing in the opposite direction. Permanent at the outlet of the water pump, the outlet of the drain, and other places where fluid reverse flow is not allowed. There are three types of check valves: swing, lift, and clamp. For swing check valves, when the fluid can only flow from left to right, it automatically closes when flowing in the opposite direction. For a lift check valve, when the fluid flows from left to right, the valve core is lifted to form a passage, and when it flows in the opposite direction, the valve core is pressed against the valve seat and closed. For clamp type check valves, when the fluid flows from left to right, the valve core is opened, forming a passage. When flowing in the opposite direction, the valve core is pressed against the valve seat and closed. Clamp type check valves can be installed in multiple positions, have a small volume, light weight, and compact structure.