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Status : Historical
Standard Type : Main
Document No : ASTM F1565 : 00(2013)
Document Year : 2013
Pages : 8
1.1 This specification covers self-contained, internally operated, globe style, pressure-reducing valves for use in steam service. In these valves, the downstream pressure feedback is sensed by a spring-loaded diaphragm to position a pilot valve—the pilot valve uses the inlet steam pressure to position the main valve plug via an operating piston.