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Valve pressure rating is one of the primary parameters used to determine whether a valve can safely operate in a specific piping system. In industrial applications, pressure class does not simply represent the maximum working pressure of a valve. The actual pressure capability depends on the pressure-temperature rating defined by standards such as ASME B16.34, as well as valve materials, design co...
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A stop check valve on a boiler feedwater line is not selected simply because reverse flow is possible. The real question is whether one valve must perform three duties at the same location: allow stable forward flow from the feed pump, close automatically against reverse flow when the pump trips or pressure reverses, and provide a manual stop function when the line or boiler needs to be isolated. ...
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