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.
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