SWING CHECK VALVES

EXPERT make Cast steel swing check Valves are used in pipelines with liquid and gaseous fluids over a wide range of line pressures and temperatures. Check valves are defined as automatic valves which open with forward flow and close against reverse flow. The disk swings away from the valve-seat to allow flow in the forward direction, and returns to the valve-seat when upstream flow is stopped, to prevent back flow.

These valves produce the lowest pressure drop, when compared with other check valves of the same size, the internal contours and shapes allow them to fully open at low fluid velocities and create a smooth flow path through the valve.

Constructional Details

BODY AND COVER

The body is designed for strength to meet operating conditions and contoured to minimize erosion and resistance to flow. The full port area is maintained from the inlet port to the body seat ring to minimize turbulence. The outlet side of the body is designed to maximize the flow even when the disc swings partially.

DISC

Robust one piece construction to withstand the severe shock of check valve service.Hard faced with 13% CR, lapped to a mirror finish. The disc is opened and sustained in open position by the velocity pressure of the fluid and closed by the force of gravity. Seating load and resultant tightness is aided by back pressure in the line.

DISC ASSEMBLY

Non-rotating disc is fastened securely to disc hanger with a lock nut and cotter pin. Disc hanger is supported on a sturdy disc carrier hinge pin of excellent qualities. All parts are accessible from top for easy servicing.

BODY SEAT RINGS

The seat ring is seal welded to provide a bubble tight joint. On request the seat surface can be covered also with stellite, which provides increased resistance to wear, abrasion and erosion of the sealing surface.

INSTALLATION

Swing check valves are used to prevent reversal of flow in horizontal or vertical pipelines. The velocity pressure should be sufficient to hold the disc against stop.Pulsating flow as obtained at the outlet of a reciprocating pump/compressor would cause disc chatter and hence use in such application should be avoided.

Typical Applications Are

Water | Chemicals | Petrochemicals | Filtration System | Food & beverage | Oil & Gas Industries etc

Size Ranges

#150	DN 50 up to DN 300
#300	DN 50 up to DN 300

Technical Data | Design Features

Design Standard	BS-1868/API 6D
Testing Standard	API 598
Pressure/Temperature Rating	ASME B 16.34
Face to Face Dimensions	ASME B 16.10
End Connection	Flanged as per ASME B 16.5, Butt Weld as per ASME B16.25
Material	ASTM A216 Gr.WCB / ASTM A351 Gr. CF8 / CF8M

On request valves can be supplied with special testing requirements like Helium Leak testing, NACE requirement, Radiography, Magnetic Particle test, IGC test.

Valves can also be offered with IBR certification.

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