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How to know if the valve complies to Manufacturers Standardization Society (MSS) or not? I want to approve a valve for an HVAC project, but I don't know how.

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I'd contact MSS with the valve model number or specs. –  mike Aug 21 '13 at 20:24
    
What did the manufacturer, or engineering docs, say? –  Richard Raustad Aug 23 '13 at 3:12

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