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Swing Check Valve
standards:

 Design and Manufacture: Cast steel check valve to BS 1868, ASME B16.34 and API 6D；Forged steel check valve to API 602.  
    Inspection and Test: API 598 or API 6D.
    End flange dimension: ASME B16.5（for NPS≤24）；ASME B1***7 series B、API 605 or ASME B1***7 series A、MSS SP-44（for NPS＞24）.
    BW end dimension: ASME B16.25.
    Socket-weld dimension: ASME B16.11.
    Face to face and end to end: ASME B16.10.
    Pressure-temperature ratings: ASME B16.34.
    Wall thickness dimension: API 600 and BS 1868.