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insert deal valves are used to prevent backflow of the medium. They open automatically using the kinetic energy of the fluid itself and close automatically during reverse flow. They are commonly installed at the outlet of water pumps, the outlet of steam traps, and other locations where reverse fluid flow is not permitted. Check valves are classified into three types: swing check, lift check, and wafer check. For swing check valves, the fluid can only flow from left to right; they close automatically during reverse flow. For lift check valves, when the fluid flows from left to right, the valve core lifts to form a passage; during reverse flow, the valve core is pressed tightly against the valve seat to close.