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. The valves shall be of the following compositions: Composition B made with 1.25% chromium, 0.5% molybdenum and Composition B made with carbon steel. All materials shall be selected to prevent corrosion, galling, seizing, and excessive wear or erosion where applicable. Clearances shall prevent interference as a result of the thermal expansion. Cadmium plating is prohibited. Components of these valves shall include body, bonnet, bottom cover, internal trim, cylinder liner, piston, gaskets, diaphragm, springs, and bolts. Valves will be operated, maintained, and repaired on board ships and shall emphasize simplicity, maintainability, ruggedness, and reliability. Design shall permit access for adjustment and repair when working from either side of the valve and without requiring removal of the valve body from the line. Each production valve shall be subjected to the following tests: nondestructive test, hydrostatic test, seat tightness test, and external leakage test.
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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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A105/A105M Specification for Carbon Steel Forgings for Piping Applications
A182/A182M Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service
A193/A193M Specification for Alloy-Steel and Stainless Steel Bolting for High Temperature or High Pressure Service and Other Special Purpose Applications
A194/A194M Specification for Carbon and Alloy Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both
A216/A216M Specification for Steel Castings, Carbon, Suitable for Fusion Welding, for High-Temperature Service
A217/A217M Specification for Steel Castings, Martensitic Stainless and Alloy, for Pressure-Containing Parts, Suitable for High-Temperature Service
A515/A515M Specification for Pressure Vessel Plates, Carbon Steel, for Intermediate- and Higher-Temperature Service
A516/A516M Specification for Pressure Vessel Plates, Carbon Steel, for Moderate- and Lower-Temperature Service
A547 Specification for Steel Wire, Alloy, Cold-Heading Quality, for Hexagon-Head Bolts
marine; ship; steam; valves;
ICS Number Code 23.060.40 (Pressure regulators)
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