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Valve & Fitting Standards SP-88-1993 (R2001), $146.00 This MSS Standard Practice applies to valves for general liquid and gas
service which effect valve closure by means of a resilient diaphragm sealing
against a weir on a diaphragm acting in conjunction with a separate or
integral disk member sealing against a seat, having equal sealing capability
in either flow direction and having diaphragms being essentially made
of elastomeric or plastic material or combinations thereof. |