These valves are used to provide an easy access to tank and to assure a large emergency relief opening in case of exposure to fire. Standard Materials : -Body: fabricated carbon steel with Stainless Steel electrowelded seat, or AISI 304 or 316 Stainless Steel. -Cover: Carbon steel or AISI 304 or 316 Stainless Steel. -Diaphragms: synthetic rubber or P.T.F.E. -Flange: API 650; on request drilled to ANSI 150 or ISO PN10.
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