Check valve allows flow in one direction and automatically prevents back flow (reverse flow) when fluid in the line reverses direction. Check valves are used with a variety of media: liquids, air, other gases, steam, condensate, and in some cases, liquids with fines or slurries. Check valves are flow sensitive and rely on the line fluid to open and close. The internal disc allows flow to pass forward, which opens the valve.
Swing check valve permits full swing of disc, thereby minimising flow losses and erosion. Swing check valves are suitable for horizontal and vertical installation.