1、MIL-V-24545 (SHI 24 September 1976 MILITARY SPECIFICATION VALVE, DISTILLING PLANT, STEAM PRESSURE REDUCING, QUIET DESIGN FOR SUBI.ZARINE SYSTEMS This specification is approved for use by the Naval Sea Systems Command and is available for use by all Departments and Agencies of the Department of Defen
2、se. 1. SCOPE 1.1 This specification covers quiet design, self-contained steam pressure reducing valves. 2. APPLICABLE DOCUMENTS I 2.1 Issues of documents. The following documents of the issue in effect on date of invitationmis or request for proposal, form a part of the specification to the extent s
3、pecified herein. SPECIFICATIONS MILITARY MIL-V-3 - Valves, Fittings, and Flanges (Except for Systems Indicated MIL-R-196 - Repair Parts for Internal Combustion Engines, Packaging of. MIL-S-901 - Shock Tests, H.I. (High-Impact), Shipboard Machinery, Equipment and Systems, Requirements for. MIL-R-1713
4、1 - Rods , And Powders, Welding, Surfacing. NIL-G-21032 - Gaskets, Metallic-Asbestos, Spiral Wound. Herein), Packaging of. STANDARDS MILITARY MIL-STD-167-1 - Mechanical Vibrations of Shipboard Equipment (Type I - MIL-STD-271 - Nondestructive Testing Requirements for Metals. MIL-STD-278 - Fabrication
5、 Welding and Inspection; and Casting Inspection and Repair for machinery, Piping and Pressure Vessels in Ships of the United States Navy. MIL-STD-740 - Airborne and Structureborne Noise Measurements and Acceptance Criteria of Shipboard Equipment. (Copies of specifications, standards, drawings, and p
6、ublications required by contrac- tors in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) the extent-ified herein. of invitation for bids or request for proposal shall apply. Environmental and Type II - Internal
7、ly Excited). 2.2 Other ublications. The following documents form a part of this specification to Unless otherwise indicated, the issue in effect on the date NATIONAL BUREAU OF STANDARDS Handbook H28 - Screw-Thread Standards for Federal Services. (Application for copies should be adressed to the Supe
8、rintendent of Documents, Govern- ment Printing Office, Washington, D.C. 20402.) Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Ship Engineering Center, Center Building, SEC 612
9、4, Prince Georges Center, Hyattsville, Maryland 20782 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. FSC 4820 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-
10、,-MIL-V-24545 (SH) AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) . Bl.12-72 - Class 5 Interference - Fit Thread. B16.5-73 - Steel Pipe Flanges and Flanged Fittings. B18.2.172 - Square and Hex Bolts and Screws Including Askew Hex Bolts, Hex Cap Screws, and Lag Screws. (Application for copies should be
11、 addressed to the American National Stnadards Institute, 1430 Broadway, New York, N.Y. 10018.) AMERICAN SOCIETY FOR TESTING AND MATERIAL (ASTM) A105-75 - Forgings, Carbon Steel for Piping Components. A193-75 - Alloy-Steel and Stainless Steel Bolting Materials forHigh A194-74 - Carbon and Alloy Steel
12、 Nuts for Bolts for High-pressure iind High- A216-75 - Carbon, Steel Castings Suitable for Fusion Welding for High- A675-72 - Special Quality Hot-Rolled Carbon Steel Bars Subject to Mechanical Temperature Service. Temperature Service. Temperature Service. Property Requirements. (Application for copi
13、es should be addressed to the American Society for Testing and (Technical society and technical association specifcations and standards are generally Materials, 1916 Race Street, Philadelphia, Pa. 19103.) available for reference from libraries. They are also distributed among technical groups and us
14、ing Federal agencies.) 3. REQUIREMNTS 3.1 Sam le for first article ins ection. Prior to beginning production a sample shall 3.2 Valve descrfzzon. be examine however, furnace temperature controls for heat treat- ment of parts shall be as accurate as the controls of the furnace(s) in which the sample
15、material was heat treated. mechanical properties shall be in accordance with the material specifica- tion. properties shall be included on the part drawing. less than 10 elongation in 2 inches be allowed. Acceptance criteria for the The tensile test requirements and acceptance criteria for mechanica
16、l In no case shall dutility 3.4 Design and construction. 3.4.1 Desi n conce t. Valves will be operated, maintained, and repaired onboard Naval ships dali emFhasize simplicity , maintainability, ruggedness , and reliability. Design shall permit access for adjustment and repair when working from eithe
17、r side of the valve and without requiring removal of the valve body from the line. 3.4.2 Maintainability. Internal parts shall permit easy disassembly and reassembly with standard tools and shall prevent, as far as practical, the incorrect reassembly of - parts. Positioning and alinement of all part
18、s in assembly shall employ positive means so that correct reassembly is repeatedly assured. In no case shall parts for a given valve be 1 physically interchangeable or reversible unless such parts are also interchangeable or reversible with regard to function, performance and strength. within the ti
19、me limits specified: I 1 - 3.4.2.1 Valve design shall permit accomplishment of the following maintenance actions trim replace quiet flow regulating element Remove, clean, and 2-1/2 hours 3.4.3 Interchangeability. Valve design shall permit interchangeability without individual modification-of like pa
20、rts between all valves. identity and shall be replaceable-from stock or the manufacturer on a non-selective and random basis. changeable with each oth6r with respect to installation (physical) and performance (function). Physically interchangeable assemblies, components, and parts are those which ar
21、e capable of being readily installed, removed, or replaced without alteration, misalinement, or damage to parts being installed or to adjoining parts. No fabrication operations such as cutting, filing, drilling, reaming, hammering, bending, prying, or forcing shall be required. This is not intended
22、to preclude the use of special tools, fixtures, and other shop aid during original assembly of the parts into the article. However, any special tools required for maintenance shall be supplied with the valve. Special tools are defined as those tools not listed in the Federal Supply Catalog (copies o
23、f this catalog may be consulted in the office of the Defense Contract Administration Service (DCAS). Each part shall have part number Parts having the same manufacturers part number shall be directly inter- I 3.4.4 C rin 8. Springs shall not be fully compressed during any normal operation or adjustm
24、ent o-alve. exceed 5 percent over a 1000-hour period at the nominal operating temperature. shall be squared and ground. shall be incorporated to preven The working stress shall be such that relaxation shall not I Spring ends 3.4.5 Threads. Threads shall conform to Handbook 128. Where necessarv.-orov
25、isions Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-24545 4 M 7777706 0274986 T = MIL-V-24545 (SH) 3.4.6 Pressure-temperature rating. Pressure-temperature rating shall be in accordance 3.4.7 End connection. End connections shall be in-line 6
26、00 pound series raised-face with 600 pound series in accordance with ANSI B16.5-73. flanges in accoraance with ANSI B16.5-73. to-face distance between the raised-faces shall be as specified (see 6.2.1). Valves shall be capable of being installed, operated, adjusted, and maintained within the envelop
27、e specified (see 6.2.1). Inlet and outlet bore diameter shall be as specified (see 6.2.1), in order to match the piping bores. 600 pound series, raised-face flange in accordance with ANSI B16.5-73. Size shall be as specified (see 6.2.1). Face- The external sensing the line shall be a l/2-inch i,p.s,
28、 3.4.8 Bonnet and bottom cover joints. Bonnet and bottom cover (where applicable) shall be flangedorttachmentthe body. following: Joints shall be secured by either of the .(a) Through-bolts threaded the entire length and fitted with a nut on each (b) end. Threads on both bolts and nuts shall be clas
29、s 2 fit in accordance with Handbook H28. the nut end. Interference fit shall be in accordance with ANSI B1.12-72. Tap-end studs with interference fit at the tap end and a class 2 fit at Bonnet and bottom cover shall be located by body guiding (i,e. a close tolerance fit between machined diameters on
30、 the body, bonnet, and bottom cover) rather than depending on studs or bolts for location, Sprial wound gaskets shall be fully retained and the joints shall have metal-to-metal take-up to provide controlled compression of the gaskets. To assure easy gasket removal, not more than two gasket-retaining
31、 faces for each gasket shall be formed on a single part. Bolting area shall be provided to maintain metal-to-metal make-up over at least a 3 year period without retightening. the valve shall be finished machined. forging and be a basic globe configuration with in-line inlet and outlet ports. Joint d
32、esign shall assure parallel alinement of the guide bushings. Bearing surface of nuts and their respective surfaces on 3.4.9 Body construction. Valve bodies shall be machined from a one-piece casting or 3.4.10 Internal trim. 3.4.10.1 Main valve. Internal trim shall be of cage construction. The quiet-
33、flow regulating elemmane seat ring shall be clamped in position by a cage which is either part of, or held in position by, the bonnet or bottom cover flange. replacement of all internal trim by avoiding the use of any threads within the valve cavity (such as seat-ring threads). compression at all ti
34、mes to avoid any movement or looseness and the quiet-flow regulating element shall be confined and compressed on both top and bottom by this cage construction. 3.4.11 Quiet-flow re ulatin element. Element design employed to achieve a low-noise pressure loss shall avoid moisture content as specified
35、(see 6.2.1). (b) Inlet pressure range - As specified (see 6.2.1). (c) Design pressure - As specified (see 6.2.1). (d) Temperature - As specified (see 6.2.1). (e) Flow demand range - As specified (see 6.2.1). (f) Rate of flow demand variation - As specified (see 6.2.1). (9) (h) Shock - As defined by
36、grade A, class I of MIL-S-901. (i) Vibration - As defined by type I of MIL-STD-167-1. Rate of inlet pressure variation - As specified (see 6.2.1). 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-V-24545 (SH) 3.6 Performance requirements. 3.6.1
37、 Accurac of re ulation. Accuracy of regulation, defined as the maximum permis- sible variation in %oKstrkn pressure which can occur with the valve set anywhere within the required range of adjustment and than subjected to the specified combinations of service and ambient conditions defined in 3.5.,
38、shall be as specified (see 6.2.1). 3.6.2 Ca acit . The valve is required to throttle flow between the limits specified, (see 3.5 and*: Between flow rates specified, at any set point within the range defined in 3.6.3, and at any inlet pressure and transient condition defined in 3.5, the valve shall o
39、perate smoothly without hunting, chattering, exceeding the noise criteria specified in 3.6.4, or violating the accuracy of regulation specifie.d in 3.6.1. 3.6.3 Range of adustment. The valve shall be adjustable over a range of delivered pressure as specifS-1). 3.6.4 Noise. The valves shall meet the
40、airborne and structureborne noise measurements in accordancm the requirements, measurements and data reporting procedures of MIL-STD- 740 and the Appendix to this specification. This equipment shall not exceed the grade C airborne and type 2 structureborne criteria of MIL-STD-740. ments defined by g
41、rade A, class I of MIL-S-901 and the environmental vibration requirements defined by type I of MIL-STD-167-1. 3.6.5 Mechanical shock and vibration. Valves shall meet the mechanical shock require- 3.7 Markisq. 3.7.1 Bod markin s. The manufacturers name or trademark and the body material composition d
42、l be ca% or forged integral with the valve body. flow arrow shall be cast or forged integral with the valve body or die stamped on raised metal pads (1/8 inch added wall thickness minimum). Each valve shall have an identification plate permanent- ly attached to an exposed position on the valve that
43、will not be covered by insulation. The identification plate shall be made of corrosion-resistant material and shall contain the following information or a space therefor: The size, rating, and a 3.7.2 Identification plates. Manufacturers name and address MIL-v-2 4 5 4 5 ANSI 600 pound rated. Adjusta
44、ble set pressure range. Manufacturers model and part number or identification. Manufacturers drawing numbers (assembly and CD). Technical manual number. 9-digit CID/APL number 3.8 Technical data. The contractor shall prepare engineering drawings and a technical manual in accordance with the data ord
45、ering documents included in the contract or order (see 6.2.2). 3.8.1 En ineerin drawin s. The contractor shall prepare engineering drawings in accordance w-adg document included in the contract or order (see 6.2.2) , the following technical features shall be included: (a) Calculated average fluid ve
46、locity through various portions of the valve. These shall include the inlet and outlet ports and, at minimum, enough sections within the valve to cover any velocity change in excess of 25 percent. (1) (b) Construction details of the “quiet“ throttling element, including: Data on maximum particulate
47、sizes that can be passed without clogging, (2) brief discussion or rationale on the mechanics by which pressure breakdown is achieved without generating the noise level normally associated with orificial throttling, (3) method of fabrication: configuration and process of fabrication shall be describ
48、ed in sufficient detail to illustrate that adequate structural strength and freedom from flow passage obstruction is assured during production (c) Calculations verifying compliance with the flow passage and overall flow- Required dimensiona rate consistency requirements specified in 3.4.11. inspecti
49、ons shall be detailed. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-24545 (SH) id) Complete production details of the seat, disc, and stem assembly and all other (e) Layout of the pressure-containing envelope (body, bonnet, and bottom replaceable internal trim. cap) giving dimensions which control compression of the spiral-wound gaskets. repair the gasket-sealing surfaces on these partsI that compensating cuts can be accurately ma
