1、 -,- E-alp-/P MIL-V-ZL(bL(2 L(8 W 7777906 0275225 O - MIL-V-24642(SH) 13 September 1984 MILITAY. SPECIFICATION VALVE, 2-INCH NPS, AUXILIARY TURBINE OVEKSPEED TKIP, SOLENOID ACTIVATED This specification is approved for use by the Naval Sea Systems Command, Department of the Navy, and is available for
2、 use by all Gepartments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the design and manufacture of soleKOid activated turbine trip valves. 1.2 Classification. Valve ratings shall be of the 600 pound class an 1,500 pound class in accordance with ANS B16.34
3、as specified (see 6;2.1). 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1. Specifications and standards. Unless otherwise. specified, the following specifications and standards of the issue listed in that issue of the Department of Defense Index of Specifications and Standards (DoDISS) speci
4、fied in the solicitation form a part of this Specification to the extent specified herein. SPECIFICATIOES MILITARY MIL-S-901 - Shock Tests, H.I. (High-Impact); Shipboard Machinery, Equipment and Systems, Requirements for. -. MIL-A-907 - Antiseize Compound, High Temperature. MIL-R-17131 - Rods and Po
5、wders, Welding, Surfacing. MIL-E-17555 - Electronic and Electrical Equipment Accessories, MIL-G-21032 - Gaskets, Metallic-Asbestos, Spiral Wound. and Repair Parts; Packaging and Packing of. Benefi.cia1 comments (recommendations, additions, deletions) and any pertinent data which may be of use in imp
6、roving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 5523, Department of the Navy, Washington, DC 20362 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. FSC 4810 / THIS DOCUM
7、ENT CONTAINS -AT - PAGES Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-24642 98 7777906 0275226 2 MIL-V-24642 (SH) . STANDARDS MILITARY MIL-STD-167-1 - Mechanical Vibrations of Shipboard Equipment (Type I - Environmental, and Type 1.1 - Inter
8、nally Excited). Inspection and Repair for Machinery, Piping and Pressure Vessels for Ships of the United States Navy, Crimp Contact, A end Casting MS3402 - Connector, Receptacle, Electric, Box Mounting, . MS3406 - Connector, Plug, Electric, Front Release, Crimp 2.1.2 Government drawings. The followi
9、ng Government drawing forms a part of this specification to the extent specified herein. DKAWING NAVAL SEA SYSTEMS COMMAND (NAVSEA) NAVSHIPS 803-1385620 - Handwheels for Valves. (Copies of specifications, standards, and drawings requlred by contractors in connection with specific acquisition functio
10、ns should be obtained from the contracting activity or as directed by the contracting officer.) 2.2 Other publications. The following documents form a part of this specification to the extent specified herein. The issues of the documents which are indicated as DoD adopted shall be the issue listed I
11、n the current DoDISS and the supplement thereto, if applicable. AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) B1.12 - Class 5 Interference-Fit Thread. Bl6.5 - Pipe Flanges and Flanged Fittings. (DoD adopted) B16.34 - Valves-Flanged and Buttwelding End Steel, Nickel Alloy, and Other Special Alloys. (D
12、oD adopted) B18.2.1 - Square and Hex Bolts and Screws Inch Series Including Hex Cap Screws and Lag Screws. B18.3 - Socket Gap, Shoulder and Set Screws-Inch Series Including Dimensions of Hexagon and Spline Sockets and Keys to Match. (DoD adopted) (DoD adopted) (DoD adopted) B46.1 - Surface Texture (
13、Surface Roughness, Waviness and Lay). (Application or copies should be addressed to the American National Standards Institute, 1430 Broadway, Mew York, NY 10018.) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-2i642 48 m 9997906 0275227 4 m
14、MIL-V-24642(SH) AS TM A 182 - A 193 - A 194 - A 216 - A 214 - A 395 - A 479 - A 582 - B 633 - Forged or Rolled Alloy-Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service. (DoD adopted) Alloy-Steel and Stainless Steel Bolting Materials for High-Temperature Service. (
15、DoD adopted) Carbon and Alloy Steel Nuts for Bolts for High-pressure and High-Temperature Service. (DoD adopted) Steel Castings, Carbon, Suitable for Fusi.on Welding for High-Temperatcre Service. (DoD adopted) Steel Castings, Martensitic Stainless and Alloy, for Pressure Containing Parts, Suitable f
16、or High-Temperature Service. (DoD adopted) Use at Elevated Temperatures, Shapes for Use in Boilers and Other Pressure Vessels. (DoD adopted) Free-Machining Stainless and Heat-Resisting Steel Bars, Hot-Rolled or Cold-Finished. (DoD adopted) Electrodeposited Coatings of Zinc on Iron and Steel. Ferriti
17、c Ductile Iron Pressure-Retaining Castings for Stainless and Heat-Resisting Steel Wire, Bars, and (DoD adopted) (DoD adopted) (Application for copies shculd be addressed to ASTM, 1916 Race Street, Philadelphia, PA 19103.) INSTRUMENT SOCIETY OF AMERICA (ISA) S75.02 - Control Valve Capacity Test Proce
18、dure (Application for copies should be addressed to Instrument Society of America, P.O. Box 12277, Research Triangle Park, NC 27709.) NATIONAL ELECTRICAL MANUFACTUREKS ASSOCIATION (NEMA) ICS.l - General Standards for Industrial Control and Systems (DoD adopted) (Application for copies should be addr
19、essed to National Electrical Manufacturers Association, 2101 I Street NW, Washington, DC 20037.) (Industry associations specifications and standards are generally avail- able for reference from libraries. They are also distributed among technical groups arid using Federal. agencies. ) .2.3 Order of
20、precedence. In the event of a-conflict between the text of this specification and the references cited herein, the text of this specifi- cation shall take precedence. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-24b42 YB 77777Ob 0275228 b
21、MIL-V-24642(SH) 3 REQUIREMENTS 3,l First article. When specified (see 6.2.1), a sample shall be subjected to first article inspection (see 4.3 and 6.3). 3.2 General description. Thic.valve is intended for installation in any position at the inlet of a steam driven turbine for the purpose of tripping
22、 closed to stop steam flow and turbine operation upon electrical command from a remote sensing system. driven toward the seated position by spring force. A latch device which opposes the spring force shall be engaged at all times regardless of the handwheel or disc position until the 12 volt direct
23、current (Vd.c.) solenoid Is energized. allowing the valve to close under spring force. No damage shall occur to the latch mechanism or seat if the maximum tangential force exerted on the rim of the handwheel (sec? 3.4.10.3) is exceeded. A manual tripping device shall be provided which will allow the
24、 valve, regardless of the position of the disc, to be tripped manually in the event of a loss of electrical power. A handwheel driven mechanism shall be Incorporated to reset the valve after it has tripped closed. manual engagement of the latch mechanism. Counterclockwise rotation shall then lift th
25、e valve disc. to the fully open position, The valve shall incorporate a gland exhaust connection to prevent excess steam leakage past the stem without resorting to packing. The valve shall have a single seated disc which is Energization of the solenoid will disengage the latch mechanism Clockwise ro
26、tation of the handwheel to the stop position shall allow 3.3 Material. Valve body and bonnet material composition shall be 1-1/4 percent chromium and 1/2 percent molybdenum. fied in table I, Material for parts not listed in table I shall be suitable or the intended pressures and temperatures, and se
27、lected to prevent galling, seizing, or excessive wear on operating parts. Clearances shall prevent interferences due to thermal expansion. Other material shall be as speci- TABLE I. Material. Name of parts Applicable document Body and bonnet ASTM A 182, grade F11; AS!CM A 217, grade WC6 Yoke ASTM A
28、395; ASTM A 216, grade WCB Gaskets MIL-G-21032 Bolting ASTM A 193, gra.de B16; ASTM A 194, grade 4 Stem ASTM A 582, type 416; ASTM A 479, type 410 Seat and disc facing MIL-R-17131, type MIL-RCoCr-A 4 i .i Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,
29、-,-MIL-V-24642 48 7779906 0275227 8 MIL-V-24642(SH) 3.3.1 Hard facing of seats and discs. The seating surfaces of discs and sears shall be hard faced. Welding rods used for hard facing shall be type MIL-RCoCr-A of MIL-K-17131. The finished thickness of hard faced surfaces shall be not less than 3/32
30、 inch. inspected after final machining in accordance with MIL-.STD-278 (see 3.4.11.7.2). Seating surface shall be liquid penetrant 3.3.2 Handwhcels. Handwheels 10 inches and smaller in diameter shall be of malleable iron or aluminum, Handwheels larger than 10 inches in diameter shall be of aluminum
31、alloy. 3.3.3 Recovered materials. Unless otherwise specified herein, all equipment, naterial, and articles incorporated in the products covered by this specification shzll be new and shall be fabricated using materials - produced from recovered materials to the maximum extent practicable without jeo
32、pardizing the .intended use. which have been collected or recovered from solid waste a.nd reprocessed to become a source of raw materials, as opposed to virgin raw materials. the above shall be interpreted to mean that the use of used or.tebuilt products is allowed under this specification unless ot
33、herwise specifically specified, The term “recovered materials meaiis materials None of 3.4 Design and construction. 3.4.1 Threads. Where necessary, provisions shall be incorporated to prevent the accidental looseiiing of threaded parts. Pipe threads shall not be used. The threads cn all threaded fas
34、teners, except handwheel nuts, shall be coated with antiseize compound in accordance with MIL-A-507 prior to assembly . 3.4.2 Interchangeability. Valve design shall permit interchangeability without individual modificaticn of like parts between valves. Each part shall have part number identity, and
35、shall be replaceable on a noiiselective and random basis. following definition: those which are 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, dril
36、ling, reaming, hammering, bending, prying, or forcing shall be required. This does not preclude lapping in metal-to-metal seating surfaces to obtain required seat tightness. No special tools shall be required for maintenance of the valve. Parts having the same manufacturers part number shall be dire
37、ctly interchange- able with each other with respect to installation and performance without requiring selection or fitting. Physical interchangeability shall be in accordance with the Interchangeable assemblies , components, and partsnre 3.4.3 Accessibility. Valves shall be accessible for adjustment
38、, repair, or replaceme.nt of the solenoid without requiring removal from the line. 3.4.4 Maintainability. Valve design shall permit disassembly and * reasseiilbly of internal parts with standard tools and prevent the incorrect reassembly of parts. shall employ a positive means so that correct reasse
39、mbly is repeatedly assured. Psitioning and alinement of all parts in the assembly 3.4.5 Cyclic life, Valves shall pass the cyclic life test of 2,000 cycles as specified in 4.6.4. During and subsequent to this test, valves shall not fail to perform their principal function as specified in 3.2. Provid
40、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-24b42 48 7777706 0275230 4 MIL-V-24642(SH) 3.4.6 Space envelope. The valve shall not exceed the following dimen- sions: -Applicable length (see 3.4.11.2), 17 inches width, and 44 inches in height. 3.4.7
41、 Maintenance envelope. The valve maintenance envelope shall not exceed the following dimensions: 24 inches length by 17 inches width by 58.5 inches height, 3.4.8 Gland exhaust connection. The gland exhaust connections shall be 1/2-inch diameter flanges in accordance with ANSI B16.5. 3.4.9 Welding an
42、d fabrication, 3.4.9.1 Welding. Unless otherwise specified (see 6.2.1), welding shall be in accordance with MIL-STD-278. 3.4,9.2 Fabrication. Fabricated assemblies shall be stress relieved as units prior to finish machining, dance with MIL-STD-278, The stress relieving shall be in accor- 3.4.10 Valv
43、e handwheels. 3.4.10.1 Operation. Valve shall be closed manually by clockwise rotation of the handwheel when facing the handwheel. wheel shall not move when the valve is tripped closed. In addition, the hand- 3,4,10.2 Design. Handwheels 10 inches and smaller in diameter shall be of commercial design
44、, Handwheels larger than 10 inches in diameter shall be in accordance with Drawing 803-1385620, except that they may be forged or die cast. 3.410.3 Size. Valve handwheels shall be sized so that a tangential force no more than the value specified in table II is required to be exerted 011 the rim.of t
45、he handwheel to affect closure of the valve against a differ- ential pressure equal to the cold working pressure of the valve and pass the hydrostatic pressure test of 4.6.5. TABLE I. Maximum allowable tangential force to operate valve reset mechanism based on valve handwheel size. Handwheel diamete
46、r (inches) Tangential force (pounds ) 2 and below 3 4 5 6 7 8 9. 90 98 106 112 118 121 124 127 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-24642 48 m 9777706 0275233 6 MIL-V-24642 (SH) TABLE II. Maximum allowable tangential force to opera
47、te valve reset mechanism based on valve handwheel size. - Continued 14 16 Tangential force (pounds 1 Handwlie e 1 d iame t er (inches) 1.38 141 - 10 11 12 130 133 135 3.4.10.4 Handwheel fastening. -Handwheels shall be secured to the valve stem with a locknut. 3.4.11 Body subassembly. , 3.4.11.1 Pres
48、sure-temperature ratings. The design and pressure- temperature rntFng for valves shall be 600 and 1,500 class in accordance with ANSI B16.34. 3.4.11.2 End connections. The valves shall be furnished with 2-inch nominal pipe size (nps) flanged erids in accordance with hall 4.5.1.1 Disassenbly. In lieu
49、 of disassembly for,examination, valve may be visually and dimensionally examined prior to assembly. 4.5.1.2 Examination after first article tests. Valve shall be disassembled and visually and dimensionally examined for damage and wear after completion of first article tests. Disassembly and reassembly shall be per-Yormed to dete-mine the practicability of maintaining a valve of this design (see 3.4.4). 4.5.2 quality conformance. - 4
