Swing check valves are unidirectional valves preventing backflow of media. Other terms used for these valves are non-return valve or one-way check valve. Check valves work automatically, so there is no need for a wheel or actuator. Consider a check valve when there is imminent damage due to backflow or to prevent contamination. That being said, there should be the right orientation of the lone inlet and outlet to ensure that the check valves are functioning properly.
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