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  1. e4products

    Changing the Design Pressure of API 6D Gate Valve

    If a ANSI 600 gate valve was initailly manufactured say for example in 1990, the maximum design pressure at 100 Deg F would have been 1440 psig. However, now, API 6D reconizes that a ANSI 600 valve is rated for 1480 psig at 100 Deg F. If I bought a used valve that was originally a 1440 psig...

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