1、IINCH- POUNDMIL-V-2961D(SH)3 April 1990SUPERSEDINGMIL-v-2961C(SHIPS)24 May 1968(See 6.12)MILITARY SPECIFICATIONVALVES , CLOBE , PRESSURE REDUCING, GAS SERVICEThis specification is approved for use by the Naval SeaDepartment of the Navy, and is available for use by allAgencies of the Department of De
2、fense1. SCOPESystems Command,Departments and1.1 z. This specification covers self-contained globe (in-line andoffset) pressure reducing valves for gas (air or nitrogen) service intended forshipboard and marine environment use (see 6.1) Guidance in the selection andinstallation of these valves is con
3、tained in M“L-HDBK-227.1,2 Classification. Pressure reducing valves shall be of the followingtypes, classes, body type, and pressure rating, as specified (see 6.2) :Type IType 11 -Type III -Type IV -class 1Class 2 -Body ABody BDirect spring loadedCas dome loadedGas dome loaded, pilot referencedInter
4、nal pilot operatedBalanced main poppetUnbalanced main poppetIn-lineOffsetValves shall have nominal inlet pressure ratings of 200, 400, 600, 1500, 3000,3300, and 6000 pounds per square inch (lb/inz) (see 6.8.5).c-Beneficial comments (recommendations , additions , deletions) and any pertinentdata whic
5、h may be of use in improving this document should be addressed to:Commander, Naval Sea Systems Command, SEA.55Z3 , Department of the NaT,Washington, DC 20362-5101 by using the self-addressed Standardization DocumencImprovement Proposal (DD Form 1L26) appearing at the end of this document orby leccer
6、.AMsc ?/t? FSC 4820DISTRItiUTION STATEMENT A. Approved for public release; distribution is u“limired.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-2961 D(SH)2. APPLICABLE DOCUMENTS2.1 Government documents2.1.1 Specifications, standards, and h
7、andbooks. The following specifica-tions, standards , and handbooks form a part of this document to the extentspecified herein. Unless otherwise specified, the issues of these documents arethose listed in the issue of the Department of Defense Index of Specifications andStandards (DODISS) and supplem
8、ent thereto , ciced i“ the solicitation (see 6.2).SPEC1F1CATIONSFEDERALQQ-B-637QQ-C-L65 -QQ-N-28BQQ-S-763PPP-F-320 -MILITARYHIL-W3MIL-S-901MIL-F-1183MIL-S-1222MI L-P-15024 -MIL-R-17131MIL-L-191L0MIL-B-2LL90 -DOD- F-ZL669DOD- F-2h669/6STANDARDSFEDERALFED- STD-H29FF.D-STD-ti2S/2Brass, Naval: Rod, Wire
9、, Shapes, Forgings, and FlatProducts with Finished Edges (Bar, Flat Wire, andStrip)Copper-Aluminum Alloys (Aluminum Bronze) (CopperAlloy ?:umbers 606, 616 , 630, 632M, and 642); Rod,Flat P1-oduccs uizh Finished Edges (Flat Wire,Scrip, and Bar) , Shapes , and ForgingstJickcl-Copper A11OY and Nickel-C
10、opper-Silicon A11OYCastings,Steel Bars, Wire, Shapes. and Forgings, CorrosionResisting,Fiberboard; Corrugated and Solid, Sheet Stock(Container C1-ade), and Cut Shapes.Valx,cs, Ficcings , and Flanges (Except for SystemsIndicated Herein) ; Packaging of.Shock Tescs H.I. (Hi ShipboardMachinery , Equipme
11、nt and Systems , RequirementsForFittings, Pip, Cast Bronze, Silver-Brazing,Ceneral Specification for.Studs, BoICS, Hex Cap Screws , Socket Head CapScrews and I:utsPlates , Tags and Bands For Identification ofEquipmentRods and Powders , Uelding, Surfacing.Lumbel- and Plj-ood,Fire-Retardant Treated.Er
12、onze !Jickel-.+luminum (U!JSNo.”c95800) Castingsfor Sea.acer- S*rvice.Forgi”s and Forgi”8 Stock, Steel Bars, Billets andBlooms Cens I-al Specification for. (Metric)Fogings and Forging Stock, Steel Bars and Billets ,Corrosion Resisting: for Reforging. (Metric)Screw Thread Standards for Federal Servic
13、es.Set-eu Thl-ead Standards for Federal Services,Section 2, Unified Inch Screw Threads-UN and UNl?Tt,lead FOTX.SProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-v-2961D(sH)MILITARYMIL-STD-105 - Sampling Procedures and Tables for Inspection byAttri
14、butes.MIL-sTD-167-1 - Mechanical Vibrations of Shipboard Equipment(Type I - Environmental and Type 11 - InternallyExcited)MIL-STD-248 - Welding and Brazing Procedure and PerformanceQualification.MIL-STD-278 - Welding and Casting Standard.MIL-sTD-438 - Schedule of Piping, Valves, Fittings , andAssoci
15、ated Piping Components for SubmarinesService.MIL-STD-740-1 - Airborne Sound Measurements and Acceptance Criteriaof Shipboard Equipment.MIL-sTD-740-2 - Structureborne Vibratory Acceleration Measurementsand Acceptance Criteria of Shipboard Equipment.MIL-STO-777 Schedule of Piping, Valves , Fittings ,
16、andAssociated Piping Components for Naval SurfaceShipsMIL-STD-1520 Corrective Action and Disposition System forNonconforming MaterialMS16142 - Boss, Gasket Seal Straight Thread Tube Fitting,Standard Dimensions for.(Unless otherwise indicated, copies of federal and military specificationsstandards ,
17、and handbooks are available from the Standardization Documents OrderOesk, Bldg. 40, 700 Robbins Avenue, Philadelphia, PA 19111 -5094.)2.1.2 Other Government documents, drawines, and Duplications. The followingocher Government documents , drawings , and publications form a pare of this docu-ment to t
18、he extent specified herein, Unless otherwise specified, the issues arethose cited in the solicitation.DWWINGSMILITARYBIO -810-3B58B4 - Unions , Fittings and Adapters , Butt and SocketWelding, 6000 PSI, WOG and OXY (IPS)385943 - Silver Brazing, 3000 PSI , WOC , IPS for UTInspection. -81O-13 B5946 - U
19、nions , Bronze , Silver Brazing, WOG or UT=-” Inspection.(Application for copies should be addressed to the Standardization DocumentsOrder Desk, Bldg. 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094. )2.2 Non-Government Duplications The following document(s) form a part ofthis document to the ex
20、tent specified herein, Unless othenise specified, theissues of the documents which are 00D adopred are those listed in tbe issue of theDODISS cited in the solicitation, Unless otherwise specified, the issues ofdocuments not listed in the DOOISS are the issues of the documents cited in thesolicitatio
21、n (see 6.2)Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-v-2961 D(sH)AMERICAN IRON AND STEEL INSTITUTE (AISI)Steel Products Manual(Application for copies should be addressed to the American Iron and SteelInstitute, 350 Fifth Avenue, New York, N
22、Y 10001. )AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)ANSI/ASP!E-B46 .1 - Surface Texture (Surface Rcmghness , Waviness ,and Lay) (DoO adopted)(Application for copies should be addressed to the American NationalStandards Institute, 1430 Broadway, New York, NY 10018. )AMERICAN SOCIE31 FOR TESTItJC AN
23、D MATERIALS (ASTM)A 566 .B21-B61-B 1L8B 150B 151B 171Standard Specification for HotRolld, and Cold-FinishedAge-Hardening Stainless and Heat-Resisting Steel Bars andShapesStandard Specification forShapes. (DoD adopted)Standard Specification for-(DoD adopted)Standard Specification forSra”dard Specific
24、ation forShapes (DoD adopted)Standard Specification forSilver) and Copper-NickelStandard Specification forNaval Brass Rod, Bar, andSteam or Valve Bronze Castings.Alumi.nmn-fJrOnze Sand Castings.Aluminum Bronze Rod, Bar. andCopper-Nickel-Zinc Alloy (NickelRod and Bar. (DoD adopted)CODDCK-A11OV Plate
25、and Sheet for. .Pressure Vessels, Condensers, and Heat Exchangers.(Application for copies should be addressed to the America” Society forTesting and Materials, 1916 Race Street, Philadelphia, PA .9103.)INSTRUMENT SOCIEi OF .MERICA (ISA)S75 .01 Flow Equations for Sizing Control Valves(Application for
26、 copies sh.a”ld be addressed to the I“strume”t Society ofAmerica, 67 Alexander Drive P.O. Be: -res.istan c macct-als from MIL-S-1222 is recommended.3.3 Conscruccion, Cons crucr ion of the vsl.,esshall b- as specified i“ 3.3.1through 3.3.9 (SC 6.3).3.3.1 Concept. Internal trim shall be readily replac
27、eable witho”c requiringremoval of che valve body from the line. Design emphasis shall be placed o“simplicity, maintainability , ruggedness , and reliability, as defined in 3.3.1.1through 3.3. Isubjecc to damage, mslfunctio”, or leakage resulci”g fromforeign particle and other line media contami”atio
28、” or from mi.shandli”g.Therefore, valves shall not incorporate OL-rely “pen excessively fine clearancesor finishes. Valve* shall tolerate occasional particulate co”taminacion “p to 40microns in size.3.3.1.4 Reliability,. Valves shal operate satisfactorily for excemdedperi Ods of time with minimum ne
29、ed for maintenance, Iubricatio”, c,r adjusme”,when subjected to the co”ditio”s normally associated with shipboard sem, ice,Valves, shall not require aillcella”ce or lubricacio” =C i“tenals shorer han Iyear under cOnrnuOLLs usc in shipboard applications.6Provided by IHSNot for ResaleNo reproduction o
30、r networking permitted without license from IHS-,-,-MIL-V-2961D(SH)3.3.1.5 Welding. Welding shall be in accordance with MIL-STD-248 andMIL-STD-278.3.3,2 Pressure enveloue. The nominal inlet (see 6.8.5), design (see 6.8.6),hydrostatic proof (see 6.8.7) , and burst (see 6.8. 8) pressures for the press
31、urecontaining envelope (body, gas dome or spring housing, and bottom cap) shall be asspecified in table I. Design temperature (see 6.8.6) shall also be as specifiedin table 1.TABLE 1. Desicn and test DressuresNominal inlet Design Hydrostatic Hydrostaticpressure pressure Design temp. proof press. bur
32、st press,rating (lb/inz) (lb/in*) (“F) (lb/in) (lb/inz)200 2L0 165 max 300 400400 480 165 max 600600800 720 165 max 900 1200 1500 1800 165 max 2250 30003000 3600 165 max 4500 60003300 3960 165 max 4950 66006000 7200 165 max 9000 12000As required ?Iominal inlet 165 max Nominal inlet Nominal inletpres
33、s. x 1.2 press. x 1.5 press. x 2.03 .3.3 Seat construction. A gasket or O-ring sealed sear ring shall beprovided which is either threaded in or retained by cage type construction. Tbepoppet or plug guiding surfaces (bushings and posts) shall have the properhardness (see 3.2.5) , finish, concentricit
34、y, parallelism, clearances, length, andrigidity to prevent binding or seizing and to ensure proper seating under alloperating conditions These alignment requirements shall be maintained withinterchangeable parts and under any tolerance stackup condition. A nonmetallicseating feature shall be incorpo
35、rated in either the poppet or seat , and shall bereadily replaceable on all sizes. P.precision dimensioned gland or cavity shallbe provided in either tbe body or seat ring to ensure proper and controlledretention of the sealing element.3.3.4 Bodv construction. Valves shall be basic globe configurati
36、on with in-line or offset inlet and outlet ports. Pressure lines, including the reducedI pressure sensing (impulse) line, gas dome loading line , and poppet balance line ,where applicable, shall be internally ported in the valve body. Oirect highvelocity impingement of tbe=Tlow- issing from the thro
37、ttling orifice onto thesensing element shall be prevented. The bonnet or spring housing and bottom capshall be attached to che body with bolted flanges or threaded union connection.Bearing surfaces of nuts and bolts and their respective mating surfaces on thevalve shall be machine finished.3.3.5 Int
38、erchangeability. Parts having the same manufacturer s part numbershall be directly interchangeable with each other with respect to installation andperformance wicho”t requiring selection or fitting. In no case shall parts for agiven valve be physically interchangeable or reversible unless such parts
39、 are alsointerchangeable or reversible with regard to function, performance , and strength(see 6.8.9).Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-2961 D(SH)3,3.6 Springs. Springs shall not be compressed solid during any operationof the valv
40、e Spring ends shall be squared and ground,3.3.7 Threads. Threads shall confom to FED- STD-H28 and FED- STD-H28/2Accidental loosening of threaded parts shall be prevented. External bolting shallbe compatible with standard tools (wrenches)3.3,8 Set point adjustment. The set point shall be adjustable t
41、hrough arange of at least 10 percent of the specified set pressure (see 6.2 and 6.8.1)The adjusting or loading device shall be safeguarded against accidental change inthe set point. Tbe opcio” of a camper-proof Facrory setting shall be available(see 6.2). The adjustimg screw shall have a right hand
42、thread so that clockviserocacion increases tbc set pressure. The valve shall be adjustable while underpressure.3.3.9 End connections Both the inlet and outlet connections shall be suit-able for the maximum inlet pressure and shall be selected as shown in table II.Union thread pieces shall be cast or
43、 forged integral with the valve body orsecured to the body with a straight thread and O-t-i”g seal, with straight threadsconforming to MS16142.TABLE 11. End connectionsI Pressure racing (lb/in2) I Applicable document I400 MIL-F-1183 SIL-BRZ1500 B1O-13859L6 SIL-BRZ3000 B1O-1385943 SIL-BRZ6000 810-138
44、5884 Weld endThe materials for tbe union end n“: and cailpieces shall be as specified(see 6.2). The materials for the union threadpieces and union nuts shall ,beselected by the manufacturer from the materials specified herein to preventgalling. The following materials, in addition to those listed in
45、 the documentsin table II, may be used for the union thread pieces and union nuts :(a) Q N-288, composition B(b) CRES, QQ-s-763, composition 303Se or 416s.The use of silver brazed tailpieces is prohibited for selected pressures andgases See MIL-STD-438 ancFIL-STD- 777 for specifics.3.4 Performance.
46、Valves shal,l pe-form as specified in 3.6.1 through 3. JCj of rsgulricion o,.,er speciried range of opera cin.gconditionsRated accuracy of regulation over specified range of operatingconditionsRequired maximum capacity uncicr specified conditions,Rated maximum capacicy under speciied conditions.Fail open capacit: (fox-purposes of relief val,sizing)-.21,Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
