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Non Return Valve Specification ( Check Valve )

December 5, 2009


Non Return Valve Specification ( Check Valve )

Non return valves 50 mm shall be:-

1.   Bronze non-return valve swing type to MSS SP 80 threaded to ASME B 1.20.1. Renewable nitrile rubber disc, free to rotate and hinge pin mounted. Screwed-in cap with integral seat.  Rated 20.7 bar but limited to 100 oC maximum temperature; as Crane D 140AT or equal and approved.

Non return valves > 65 mm shall be:-

1.   Cast Iron non-return valve swing type to MSS SP 71 flanged to ASME B 16.1 Class 125 flat face.  Bronze faced disk, free to rotate, hinge pin mounted. Bolted cap. Body seat ring bronze. Rated 13.8 bar; as Crane F 493 or equal and approved.

2.   Cast Iron wafer body non-return valve swing type to suit mounting to fit ASME B 16.1 Class 125/150 flanges. Bronze or bronze trim, disk free to rotate, hinge pin mounted.  Body seat facing bronze. Rated 13.8 bar; as Crane FM 450 or equal and approved.

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One Response to “Non Return Valve Specification ( Check Valve )”

  1. Anseer on February 15th, 2011 10:26 pm

    what will be the advantage of Nitril Rubber Disc against metal (Bronze) disc.
    i wonder why people go for rubber disc instead of metal. is it because to avoid hammering sound…what about the temp any concern over that….so please avoide this type of confusing spec. crane has this product ok but is it advicable for projects where normal water temp some times goes up to 40 degree C.

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