The purpose of a check valve is to allow a fluid to move through it in one direction, but prevent it from flowing in the reverse direction. In the case of a lift station, if we are trying to pump uphill and do not want all the water in the pipes coming back into the wet well when the pumps shut off, then a check valve should be specified immediately following the pumps.
A couple types of check valves used by Jensen Engineered Systems are swing check and ball check. A swing check uses a flapper gate with a hinge to allow uni-directional flow. One of the considerations when using a swing check is that it must be mounted in the horizontal position to properly allow the gate to open and close. If mounted in the vertical, or upside down, the gate can be forced to remain in the open position.
If site restraints require a check valve to be mounted in the vertical, a ball check valve should be used. Though a ball check can be mounted in either the vertical or horizontal and work properly, we typically reserve it for vertical applications. The design of a ball check uses a metal ball to allow uni-directional flow. When the water is flowing in the desired direction, the ball is forced out of the flow path. When the flow attempts to reverse, the ball falls back into the flow path and prevents reverse flow. When mounted in the vertical, gravity aids the ball by forcing it back into the flow path.
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