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Wafer check valve as a pipe system design boundry

Wafer check valve as a pipe system design boundry

Wafer check valve as a pipe system design boundry

(OP)
Is a Wafer Check Valve, when subjected to reverse flow, a stop valve for the purpose of pipe design according to ASME Code 34.3?  The main purpose of this question is to determine the boundry between system design pressures.  
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RE: Wafer check valve as a pipe system design boundry

You may want a check valve in the system for flow reasons, but the boundry valve must be a block valve. And, there is a very practical reason for this. In some designs, the is the point that separates a shop manufactured item, wherein the the pressure testing was done in the shop; from the field installation, wherein the contractor must test his piping.

RE: Wafer check valve as a pipe system design boundry

But I should add, there are differential pressure valves that can be used to open at preset pressure differences (or close at preset conditions). Call up a good boiler supply house and they can assist with selection.

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