Swing Valve

A swing valve is a butterfly-style check valve in which the disc, the movable part to block the flow, swings on a hinge or trunnion, either onto the seat to block reverse flow or off the seat to allow forward flow. The seat opening cross-section may be perpendicular to the centerline between the two ports or at an angle. Although swing check valves can come in various sizes, large check valves are often swing check valves.

Swing Valve

A swing valve is normally recommended for use in systems employing gate valves because of the low pressure drop across the valve.   Swing check valves are available in either Y-pattern or straight body design.   In either style, the disk and hinge are suspended from the body by means of a hinge pin.  Seating is either metal-to- metal or metal seat  to  composition  disk.    Composition disks are usually recommended  for services where dirt or other particles may be present in the fluid, where noise is objectionable, or where positive shutoff is required.

Swing check valve shut off depends on gravity (weight of disc) and reverse flow. The pivot point of the swing check is outside the periphery of the disc and, the greater the head, the greater the possibility that the fluid will flow back through the valve before the disc can shut off. To effect complete shut off, the disc of a swing check valve must travel through a 90 angle arc to the swing check valve seat.

For standard or critical applications Flomatic® swing check valves offer a wide range of convenience, performance and safety options. Full opening designs minimize pressure drop across the valve.

745LS (745 WITH LIMIT SWITCH (SPDT))
745LS (745 WITH LIMIT SWITCH (SPDT))
Swing Check Valves
Size(s): 2 to 24 in. (50 to 600 mm)
745BFPI Position Indicator & Backflush
745BFPI Position Indicator & Backflush
Swing Check Valves
Size(s): 2 to 24 in. (50 to 600 mm)
745PI (745 with Position Indicator)
745PI (745 with Position Indicator)
Swing Check Valves
Size(s): 2 to 24 in. (50 to 600 mm)
745BF (745 with Back Flush)
745BF (745 with Back Flush)
Swing Check Valves
Size(s): 2 to 24 in. (50 to 600 mm)
745
745
Swing Check Valves
Size(s): 2 to 24 in. (50 to 600 mm)
745ASC
745ASC
Swing Check Valves
Size(s): 3 to 24 in. (75 to 600 mm)
78
78
Swing Check Valves
Size(s): 2 1/2 to 10 in. (65 to 250 mm)
78A
78A
Swing Check Valves
Size(s): 3 to 14 in. (80 to 350 mm)
90CS/92CS
90CS/92CS
Swing Check Valves
Size(s): 2 to 30 in. (50 to 750 mm)
90LW/92LW
90LW/92LW
Swing Check Valves
Size(s): 2 to 30 in. (50 to 750 mm)
90LS/92LS
90LS/92LS
Swing Check Valves
Size(s): 2 to 30 in. (50 to 750 mm)
90/92
90/92
Swing Check Valves
Size(s): 2 to30 in. (50 to 750 mm)
93LW
93LW
Swing Check Valves
Size(s): 2 to 12 in. (50 to 300 mm)
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