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Check valve refers to a valve whose opening and closing parts are circular discs and rely on their own weight and medium pressure to act to block the reverse flow of the medium.

Make sure the pipe is not dirty and doesn’t have welding particles, for example, before installing it. This may cause irreparable damages in the valve when the equipment is started → prepare a clean working area.

For valves that are not frequently opened and closed, the handwheel should be turned regularly and lubricant should be added to the valve stem thread to prevent seizure.