1.Swing check valves are best suited for moderate velocity applications. Correct sizing of swing check valves is important. Either too low a line velocity or too high a velocity can damage valve internals and shorten valve life.

2.Service in systems involving rapid and frequent flow reversals, pulsation or excessively turbulent flow should be avoided. Locating swing check valves away from elbows, equipment, etc., within the piping system can often minimize or eliminate problems caused by this type of application. Suspected problem systems should be reviewed with Pacific Valves before selecting and purchasing swing check valves.

3.Swing check valves are normally designed for installation in horizontal pipe runs. When disc stops are designed to hold the disc slightly into the flow stream, the valves may also be used in vertical pipe runs (with flow up only). When valves are to be used in vertical pipe runs, this should be clearly specified.

4.Generally, outside lever and weights are not effective in preventing slamming of swing check valves in sizes above 6".

5.Threaded seat rings in valves in services with high velocity (turbulent) flow or thermal cycling should be lock welded to the body to avoid loosening. Please specify.