API 6D SWING CHECK VALVES

The swing check valve is designed so that it is opened automatically at the forward flow and closed at the reverse flow in horizontal or vertical (upward flow only through valve) piping runs. It has an advantage of low pressure drop and therefore is best suitable for velocity application. 

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BODY
Body-cover joint of swing check valve is machined

as follows: 
1)    Class 150 : Male and female.
2)    Class 300 and 600 : Male and female.
3)    Class 900 higher class : Ring type joint.
We can supply any kinds of gasket as required by

customer. 

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SEAT RING
The seat ring as a welded-in type is designed to prevent

any turbulence and damage by corrosion. It is forged or

rolled into one piece for all dimensions, heat treated to

obtain the desired surface hardness, and cleaned

thoroughly before assembling. 

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END CONNECTIONS
In our standard production of valve, the flange ends (RF)

and the face to face dimensions conform to ANSI B16.5

and ASME B16.10,  respectively, and they have a raised

face serrated finish type or other finish type as requested.

For butt-welded ends (B.W), of which the end to end

dimension conforms to ASME B16.10, customer must

specify the schedule type required, pipe class, or bore diameter. 

Ring joint flanged ends (R.T.J) conform to ASME B16.5 and the end to end dimension follows ASME B16.10. The other special end connections may be supplied as required by customer.

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HINGE ARRANGEMENT

• Body penetration is sealed with blind flange and 

      spiral-wound gasket

• Arm pin is located near the disc center of gravity,

      minimizing  sealing surface radius rotation and

      thus velocity.

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ARM ARRANGEMENT

• Hydrofoil profile maintains the disc stability while

      being lifted   by a hydrodynamic force at a flow

      including pulsating.

• Heavy-balanced weight insures that disc goes to

      seat immediately upon cessation of flow and

      minimizes water hammer.