1、MIL-V-23753C 48 = 7777906 0435438 7 W MIL-V-23953C( SH) 11 May 1990 SUPERSEDING 14 February 1980 MIL-V-23953B (SH) MILITARY SPECIFICATION VALVES, COMBINED VENT-CECK, FOR SUBMARINE MBT BLOW LINES (SIZES 1-1/2 TO 2-1D INCHES) This specification is approved for use by the Naval Sea Systems Command, Dep
2、artment of the Navy, and is available for use by all deparfments and agencies of the Deparhnent of Defense. L SCOPE LI Scope. This specification covers requirements for the construction, testing, and operation of combined vent-check valves with a nominal pressure seating of 4,500 pounds per square i
3、nch (lb/in2), for use in submarine main ballast tank (MBT) high pressure air blow lines. 21 Government documents. 21.1 Specifications, standards, and handbook The foliowhg specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified
4、, the issues of these documents are those listed in the issue of theLDepartment of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of us
5、e in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 5523, Department of the Navy, Washington, DC 20362-5101 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC NIA
6、 Fsc 4820 DIsnuBvnON STATEMENT A. Approved for public release; distribution is unlimited. Licensed by Information Handling ServicesSPECIFICATIONS FEDERAL PPP-F-320 QQ-N-281 QQ-N-286 QQ-N-288 MILITARY MIL-v-3 MIL-s-901 MS 16142 MIL-L-19 140 MIL-B-24480 STANDARDS FEDERAL FED-STD-H28 MILITARY MIL-STD-2
7、2 MIL-STD-167-1 _- MIL-V-23753C 48 M 7797706 0435437 7 MIL-V-23953 C( SH) Fiberboard: Corrugated and Solid Sheet Shock (Container Grade) and Cut Shapes (UNS No. 05500) Nickel-Copper Alloy Bar, Rod, Plate, Sheet, Strip, Wire, Forgings, and Structural and Special Shaped Sections . Nickel-Copper-Alumin
8、um Alloy, Wrought (UNS No. 05500) Nickel-Copper Alloy and Nickel-Copper-Silicon Alloy I Castings. Valves, Fittings, and Hanges (Except for Systems Indicated Herein); Packaging of Shock Tests, HI (High-Impact); Shipboard Machinery, Equipment and Systems, Requirements for Boss, Gasket Seal Straight Th
9、read Tube Fitting, Standard Dimensions for Lumber and Plywood, Fire-Retardant Treated Bronze, Nickel-Aluminum (UNS No. (35800) Castings for Seawater Service Screw-Thread Standards for Federal Services Welded Joint Design Mechanical Vibrations of Shipboard Equipment (Type I - Environmental and Type I
10、I - Internally Excited) 2 Licensed by Information Handling ServicesMIL-V-23753C 48 W 777770b 0435440 5 W MIGSTD-271 MIGSTD-278 MIGSTD-798 Requirements for Nondestructive Testing Methods Welding and Casting Standards Nondestructive Testing, Welding, Quality Control, Material Control, and Identificati
11、on and HI-Shock Test Requirements for Piping System Components for Naval Shipboard Use MIGSTD-889 Dissimilar Metals (Unless otherwise indicated, copies of federal and military specifications, standards, and handbooks are available from the Naval Publications and Forms-Center, (ATIN NPODS), 5801 Tabo
12、r Avenue, Philadelphia, PA 19120-5099.) 2.12 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues are those cited in the solicit
13、ation. NAVAL SEA SYSTEMS COMMAND (NAVSEA) 803-1385884 Unions, Fittings, and Adapters Butt and Socket Welding, 6,000 PSI, WOG, and OXY IPS 810-1385970 Nuts, Union, Heavy Duty 6,000 PSI, WOG, and IPS (Application for copies should be addressed to: Commander, Portsmouth Navy Shipyard, Code 202.2, Ports
14、mouth, NH 03801.) MATERIAL DESIGNATOR CATALOG, VOLUME II (Application for copies should be addressed to Naval Sea Systems Command Attachment, Naval Material Quality Assessment Office (NMQAO) Federal Building, Room 423, 80 Daniel Street, Portsmouth, NH 03801 Am SEA 07N.) (Industry association specifi
15、cations and standards are generally available for reference from libraries. They are also distributed among technical groups and using Federal agencies.) NAVAL SEA SYSTEMS COMMAND (NAVSEA) DTNSRDC Report C2537 UERD Plan No. RU 487 A Method for the Design of Submarine Pressure Hull Attachments Full S
16、cale Section Test Structure Ballast Tank 3 Licensed by Information Handling ServicesMIL-V-23953C 48 77777Ob 0435443 7 U (Application for copies should be addressed to the Naval Publications and Forms Center, (A-ITN: NPODS), 5801 Tabor Avenue, Philadelphia PA 19120-5099.) 22 Non-Government publicatio
17、ns. The following document(s) form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DOD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not list
18、ed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) B 63 B 443 Standard Test Method for Resistivity of Metallically Conducting Resistance and Contact Materials Standard Specification for Nickel-Chromium-Molybdenum- C
19、olumbian Alloy (UNS No. 6625) Plate, Sheet and Strip (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) (Non-Government standards and other publications are normally available from the organizations that prepare o
20、r distribute the documents. These documents also may be available in or through libraries or other informational services.) 23 Wer of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this
21、document, however, supersees applicable laws and regulations unless a specific exemption has been obtained. 3. REQ- 3.1 Qualincatin. Valves furnished under this specification shall be products which are authorized by the qualiwng activity for listing on the applicable qualified products list at the
22、time of award of contract (see 4.3 and 6.7). , 32 First article. When specified (see 6.2), a sample shall be subjected to first article inspection (see 6.6) in accordance with 4.4. 33 Valve description. Valves shall be spring-loaded check valves installed to prevent seawater backflow into submarine
23、high pressure air ballast tank blow lines. A vent shall be incorporated to automatically open when the check poppet closes and thus eliminate residual upstream pressure and assure maximum seating differential across the check poppet. The vent shall close against upstream pressures as high as 4,500 l
24、b/in2 when the check poppet is open. 4 Licensed by Information Handling ServicesMIL-V-23753C 48 m 7777706 0435442 7 m 3.4 Materials. Materials shall be as specified in table I (see 6.3 and 6.9). Materials shall be corrosion-resisting and selected to prevent galling, seizing, or excessive wear on ope
25、rating parts. Material selection and working clearances shall prevent interferences due to temperature changes. The use of dissimilar materials shall be minimized to preclude galvanic corrosion and shall be in accordance with MIGSTD-889. TABLE I. Lkt of materials. Nameof part Body Check poppet head,
26、 and stem one piece Springs Parts not continually expc rd O seawater (except where-otherwise specified) Poppet insert and O-rings, Bonnet union nut (where applicable) Cartridge guide assembly Guide alignment pin Materials 70-30 Nickel-Copper QQ-N-281 Composition QQ-N-288 Composition E (cast) INCONEL
27、 625 ASTM B 443 Nickel-Copper-Aluminum QQ-N-2% 70-30 Nickel-Copper or Nickel-Cobalt-Chromium- Molybdenum or INCONEL X-750 ASTM B 637 Nickel-Copper-Aluminum QQ-N-286 Nitrile Rubber (Buna-N) or Fluorocarbon Rubber (Viton) QQ-N-286 Nickel-Ahminum-Bronze MIL-B-24480 70-30 Nickel-Copper QQ-N-281, class A
28、 3.4.1 Recovered materials- Unless otherwise specified herein, all equipment, material, and articles incorporated in the products covered by this specification shall be new and may be fabricated using materials produced from recovered materials to the maximum extent practicable without jeopardizing
29、the intended use. The term “recovered materials“ means materials which have been collected or recovered from solid waste and reprocessed to become a source of raw materials, as opposed to virgin raw materials. None of the above shall be interpreted to mean that the use of used or rebuilt products is
30、 allowed under this specification unless otherwise specifically specified. 5 Licensed by Information Handling ServicesMIL-V-23753C 48 M 777790b 0435443 O M MIGV-23953C( SH) 35 Construction requirements. 35.1 Concepf. Valves will be operated, maintained, and repaired onboard Naval ships and the confi
31、guration shall emphasize simplicity, maintainability, ruggedness, and reliability (see 6.3 and 6.8). Construction 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. 352 Mahtainabiiiy. Internal parts
32、shall permit easy disassembly and reassembly and shall prevent, as far as practical, the incorrct reassembly of parts. Positioning and alignment of all parts in an assembly shall employ positive means so that correct reassembly is repeatedly assured. In no case shall parts for a given valve be physi
33、cally interchangeable or reversible unless such parts are also interchangeable or reversible with regard to function, material compatibility in accordance with (table I), performance, and strength. 3521 Speed and use of maintenance. Valve construction shall permit maintenance action to disassemble,
34、replace guide and poppet, and reassemble within a time limit of 3/4 hour. 353 Interchangeability, Valve construction shall permit interchangeability without individual modification of like parts between all valves. Each part shall have a part number and shall be replaceable from stock or the manufac
35、turer on a non-selective and random basis. Parts having the same manufacturers part number shall be directly interchangeable with each other with respect to installation (physical) and performance (function). Physically interchangeable assemblies, components, and parts are those which are capable of
36、 being readily installed, removed, or replaced without alteration, misalignment, material incompatibility, 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
37、 not intended to preclude the use of special tools, fmures, and other shop aids during original assembly of the parts into the article. However, any special tools required for maintenance shall be supplied with the valve. 35.4 Internai trim. The main spring-check assembly, comprising the check poppe
38、t, seat, and return spring assembly, shall be incorporated into a cartridge assembly which can be inserted into and removed from the valve body as a single unit. The cartridge assembly of each, manufacturer shall be identical and interchangeable between all sizes of vent-check valves made by the man
39、ufacturer to this specification. Except for the valve body, all other parts, such as the vent assembly and top closure, shall also be identical and interchangeable between all valve sizes covered by this specification. Thus, only the body, and the end connections attached thereto, where applicable,
40、shall be different between the three size valves covered in this specification made by any particular manufacturer. 355 Springs. All springs shall be on the air side of the valve. Springs shall not be fully compressed during any normal operation or adjustment of the valve. Springs shall be designed
41、so as to have a natural frequency high enough to prevent a permanent deformation of the spring resulting from surging, at least 12 times the maximum rate at which the spring operates. Surging Licensed by Information Handling ServicesMIL-V-23753C 48 W 7797706 0435444 2 Valve size (inches) 1 ID MILV-2
42、3953C( SH) End-toend dimensions (inches) 9.00 2 0.03 is defined as a phenomenon in which waves of successive compressions or extensions travel along the length of the spring and subject it repeatedly to a stress level associated with solid compression. Spring ends shall be squared and ground. Nomina
43、t rating 35.6 Threads, Threads shall conform to FED-STD-H2. Provisions shall be incorporated to prevent unintended loosening of threaded parts. Pipe threads shall not be used. Burst pressure Proof pressure (minimum) 35.7 Poppet inSert. The check poppet shall incorporate a soft-seating insert which i
44、s recessed to eliminate damage from overcompression and is of adequate strength to withstand the high flows and pressure transients associated with this application. The insert shall be replaceable on an interchangeability basis as defined by 3.5.3. 35.8 Vent. The vent shall terminate in a Winch bos
45、s in accordance with MS 16142 machined directly into the body or bonnet to permit attachment of an external line. An internal cut-out valve shall be incorporated in the body or bonnet to isolate the vent. 35.9 End preparatioa. End preparation shall be in line and shall be either 6,000 lb/in2 socket
46、or butt weld union in accordance with NAVSEA 803-1385884 and 810-1385970 or direct-weld ends (see 6.2). All welding procedures shall be in accordance with MIL-STD-278 and 22. Inside diameter of valves shall be as specified (see 6.2). Face-to-face distance between the threaded ends of union- end valv
47、es shall be in accordance with table iI. TABLE II. Face-to-face dimensions. 2 I 2 1/2 10.50 2 .O3 10.50 2 .O3 35.10 Boundary ph. The proof and burst pressures for pressure boundary parts shall be as specified in table III. TABLE III. Proof and burst pressures. (ib/n2) 4,500 (lb/n2) 13,500 7 Licensed
48、 by Information Handling Services- -_ MIL-V-23753C 48 M 777770b 0435445 4 M Internal diameter of inlet and outlet bore (inches) 1.187 2 0.010 1.338 f 0.010 1.615 -t 0.010 1.750 f 0.010 35.1 1 Maximum allowable blowdown time (seconds) 6.3 5.8 5.1 5.0 MILV-23953C( SH) Bonnet union nut. The bonnet unio
49、n nut shall be forged nickel-copper-aluminum in accordanc with QQ-N-286, class A, age-hardened for attachment to the body. 35.12 Body constnidion. Valve bodies shall be machined from a one-piece casting or forging. Inlet and outlet parts shall be in-line. 3.6 Service and ambient conditions. Service and ambient conditions shall be as follows: a. b. d. e. f. g- h. C. Huid: Outlet - air and seawater, inlet - air Maximum working pressure (inlet and outlet): 4,500 lb/in2 Working temperature: minus 5040 plus 100 degrees Fahrenheit (“F) Salt spray: external exposure to atmosphere
