Check valves are used to prevent the reversal of flow in a line. When open and under flow pressure, the checking mechanism will move freely in the media, offering very little resistance and minimal pressure drop. Valve employs a free moving ball, which unseats to permit flow in one direction, but seals against a seat to prevent backflow. Can be installed vertically or horizontally. Uniseat/seal of Viton. Ball is the only moving part. It unseats to permit flow in one direction but seals against seat to prevent backflow. Minimum shut-off of 5 psi. All sizes rated for full vacuum service. Solid thermoplastic ball. NSF-61 Certified.
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