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ASME Standards for Typical Valve Requirements

ASME - American Society of Mechanical Engineers. Founded in 1880 this organization works to ensure standards are met/improved to ensure safety and efficiency in engineering practices. www.asme.org

ANSI - American National Standards Institute www.ansi.org

ASME/ANSI B16.34 is the American Society of Mechanical Engineers standard for which valve pressure/temperature ratings are derived. This spec. indicates at what temperature/pressure rating a valve must adhere to to meet certain standards. The specification is for "steel valves- flanged & buttweld ends".

ASME/ANSI B16.10 lists all the face to face dimensions for flanged/buttweld end valves. Valves designed to this spec must meet standard face to face dimensions depending on size/pressure class. It should be noted that threaded and socket-weld valves are not designed to this spec.

Copies of these specs can be purchased directly from the American Society of Mechanical Engineers at http://www.asme.org/kb/standards#des=B16


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Valve Tip:
If a valve comes back from service, always cycle (open and close) the valve a few times outside before putting it back in stock or trying to do any repairs- it is possible for pressure to get stuck in the cavity of the valve.