1、MIL-V-24374 48 H 97777Ob 027484L b H MILV-24394(SHIPS) 3 July 1%9 MILITARY SPECIFICATION VALVES, AUTOMATIC SHUT-OFF, FOR GAS SEVICE (SIZES 1/4 TO 2 INCHES IPS) 1. SCOPE 1.1 Scope. 1.2 Classification. This specification covers self-contained automatic shut-off valves for gas (air or nitrogen) service
2、. Automatic shut-off valves shall be of the following types, as specified (see 6.2): Type I - Globe or Y pattern configuration. Type II - Straight through configuration. per square inch gage (psig) as specified (see 6.2). 1.3 Pressure ratings. Valves shall have nominal pressure ratings of NO, 1500,
3、3000, and 6000 pounds 2. BPPLICABU WGUMENTS 2.1 The following documents of the issue in effect on date of invitation for bids or request for proposal, form a part of the specification to the extent specified herein. SPEXIFICATIONS FEERAI. QQ-N-288 - Nickel-Copper Alloy and Nickel-Copper-Silicon Allo
4、y Castings. QQ-S-763 - Steel Bars, Shapes, and Forgings, Corrosion-Resisting. MILITARY MIL-S-901 MILD-1000 MIIFF-1 183 MIIrD-1000/2 MIL-M-15071 -523921 -524059 - Shock Tests, H. I. (High-Impact) ; Shipboard Machinery, Equipment and Systems - Drawings, Engineering and Associated Lists. - Drawings, En
5、gineering and Associated Lists, - Fittings, Tube, Cast Bronze, Silver Brazing. - Rod, Flat Products with Finished Edges, Shapes and Requirements for. Forgings. STANDAFDS MILITARY MIL-STD-167 - Mechanical Vibrations of Shipboard Equipment. DRAWINGS MILITARY 810-1385884 - Unions, Fittings and Adapters
6、 Butt and Socket Welding 6000 PSI, WOG and OXY (IPS). 810-1385943 - Silver Brazing, 3000 PSI, WOG, IPS for UT Inspection. 810-1385946 - Unions, Bronze, Silver Brazing, WOG for UT Inspection. (Copies of specifications, standards, drawings, and publications required by suppliers in connection with spe
7、cific procurement functions should be obtained from the procuring activity or as directed by the contracting officer. ) 2.2 Other publications. The following documents form a part of this specification to the extent.spec- Unless otherwise indicated, the issue in effect on date of invitation for bids
8、 or request for ified herein. proposal shall apply. - .“ . AISRICAN IRON AND STEEL INSTITUTE (AISI) (Application for copies should be addressed to the American Iron and Steel Institute, 350 Fifth Avenue, Steel Products Manual. New York, N.Y. 1ooO1.) FSC 4820 Provided by IHSNot for ResaleNo reproduct
9、ion or networking permitted without license from IHS-,-,-MIL-V-29394 48 7739706 0274842 B W KU-V-24394(SHIPS) . AIBRICAN SCIETy FOR TESTING AND MATERIAIS (ASTM) B-21-66 - Naval Brass Rod, Bar, and Shapes. E41-63 - Steam or Valve Bronze Castings. B-148-65 - Aluminum Bronze Sand Castings. B-15046 - Al
10、uminum Bronze Rod, Bar, and Shapes. (Application for copies should be addressed to the Americah Society for Testing and Efaterials, 1916 Race Street, Philadelphia, Pa. 19103. ) KATIONAJA BUREBU OF STANDARDS Handbook Fi28 - Screw Thread Standards for Federal Services. (Application for copies should b
11、e addressed to the Superintendent of Ikmunents, Government printing Office, Washington, D.C. 20402.) UNIFORM CLASSIFICATION COHMITTEE Uniform Freight Classification Rules. (Application for copies should be addressed to the Uniform Classification Committee, 202 Union Station, (Technical society and t
12、echnical association specifications and standards are generally available for 516 West Jackson Boulevard, Chicago, Illinois 60606.) reference from libraries. 3. REQUUIREMENTS 3.1 They are also distributed among technical groups and using Federal agencies.) Sample for first unit inspection. Prior to
13、beginning production a sample shall be examined and tested as specified in 4.2. 3.2 Definitions. 3.2.1 Automatic shut-off valve. The definitions of 3.2.1 through 3.2.9 are applicable to this specification. Automatic shut-off valves covered by this specification shall be sensitive In the open positio
14、n and under no flow conditions, and react only to the pressure differential across the valve. the valve shall be fully pressure balanced and there shall be no net pressure force tending to open or close the valve, regardless of the static pressure in the valve. drop across the valve caused by flow.
15、poppet and the seat in the open position (i.e. changing the restriction to flow presented by the valve when in the open position) and thereby changing the flow-pressure conditions under which the 1Itrip“ pressure drop across the valve occurs. reduced as required in 3.5.4. The valve shall be actuated
16、 to close by the pressure The valve shall be adjusted by adjusting the distance between the Once shut, the valve shall remain shut until the static pressure differential is 3.2.2 Set point. The flow-pressure conditions under which the valve will trip shut. Established by the spring pre-load tending
17、to hold the poppet in the open position combined with the flow restriction presented by the valve when in the open position. 3.2.3 Trip differential pressure. (psi) uhich will cause the valve to trip shut. The differentia2 pressure across the valve in pounds per square inch 3.2.1, Xccuracz. The oper
18、ating band of a given valve. Established by the following points: (a) (b) The minimum flow-pressure condition at or below which the valve will not trip shut regardless of influences such as spring relaxation, mechanical shock or vibration, etc. The maximum flow-pressure condition at or above which t
19、he valve will not remain open regardless of influences tending to resist closure such as breakloose friction, corrosion, sludge, etc. 3.2.5 Adjustable range. The range of flows (in SCFM at a given inlet pressure) over which the valve can be set to trip shut. 3.2.6 Nominal pressure rating. 3.2.7 (a)
20、H-Ibnel (a-N-288, composition B) (b) CRES (CE-S-763, composition 303Se or W6Se) 3.4.11 Manual reset. Valves shall incorporate a manual reset device which is operable with the valve in A small continuous bleed by- the line under pressure and which permits equalizing pressure across the poppet. passin
21、g the manual reset and providing automatic reset shall also be incorporated when specified (see 6.2). 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.5 Performance requirements. 3.5.1 Accurac . The accuracy, as defined in 3.2.4, shall be unless o
22、therwise spzcified (see 6.2). 3.5.2 Set int. The nominal required set pint shall be as signed to mepon+ only to the pressure differential created by the plus or minus 10 percent of the set point specified (see 6.2). These valves are de- now through the or (b) government, as the interests of .the Uni
23、ted States may require; provided that in either case the release, use, duplication or disclosure hereof shall be subject to the foregoing limitations. legend shall be marked on any reproduction hereof in whole or in part.” release to a foreign This 3.8 Manuals. Manuals shall be furnished in accordan
24、ce with type I of Mn-M-15071. The quantity and distribution of manuals shall be as specified (see 6.2). I of MZ-H-15071, shall be included as part of the manual contents: The following, in addition to that required for type (a) The approved engineering drawings for the valve (including certification
25、 data sheet). These drawings shall be supplemented by additional illustrations where necessary to adequately illus- trate operation and maintenance. partial or full sections, etc., and may eliminate extraneous lines and details to clarify the interaction of parts. Table listing wrench sizes and asse
26、mbly torques (or other equivalent procedures) for making up all joints andfhreaded assemblies. Instructions to permit overhaul by shipyard or other repair facility. cedures for checking all critical dimensions subject to wear or change and the acceptable dimensional limits, surface finish condition,
27、 etc. part replacement, correction at repair facility, or repair at manufacturers facility) which shoiild be followed to correct each case of damage or wear. complete disassembly and reassembly of the equipment, maintenance and troubleshooting sections shall contain, or refer to, only the limited di
28、sassembly and reassembly required to accomplish each particular operation. bly and unnecessary disturbance of adjustments when performing specific or limited maintenance or troubleshooting operations. These additional illustrations may consist of blowouts, (b) (c) These should include pro- Also, the
29、 appropriate procedure (that is, (d) Detailed disassembly and reassembly procedures. in addition to providing procedures for the This is intended to reduce the possibility of unnecessary disassem- (e) Adjustment procedures. 4. QUaLITY XWJF#NCE PROVISIONS 4.1 Responsibility for inspection. Unless oth
30、erwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. otherwise specified in the contract or order, the supplier may use his own or any other facilities suitable for the performance of the inspection re
31、quirements specified herein, unless disapproved by the Government, Government reserves the right to perform any of the inspections set forth in the specification where such in- spections are deemed necessary to assure supplies and services conform to prescribed requirements. and adjustable range, fu
32、rnished under a contract or order shall undergo first unit inspection as outlined in table IV. undergo the quality conformance inspection specified in 4.3. orders for the same valve for the same application. Except as The 4,2 First unit inspection. The first automatic shut-off valve of a particular
33、size, pressure rating, All subsequent valves of the same size, pressure rating, and adjustable range, furnished shall First unit inspection may be waived on subsequent 6 (- . -i_) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIGV-24394( SHIPS) Tab
34、le IV - First unit and quality conformance examination and test outline Examination and tests visual examination . hoof test External leakage Seat tightness test (see note i) H.I. shock test (see note 2) Vibration test (see note 2) Operational test (see notes 3 and 4) Test conditions - Water, air, o
35、r nitrogen at the applicable proof pressure as specified in 3.4.2 applied to: (a) Valve inlet with poppet seated and outlet open to atmosphere. Air or nitrogen at maximum (b) Valve inlet and outlet presaure rating applied to inlet and outlet. Air or nitrogen at maximum pressure rating applied to inl
36、et with poppet seated. Grade A, class I of MGS-901 Type 1 of MItSTE-167. Air or nitrogen applied to inlet of valve. and outlet of valve and flow measuring device installed in line. Inlet pressure maintained at constant value equai to value specified in the contract or order. 90 percent of specified
37、set point. Slowly increase flow to 110 per- cent of specified set point. Pressure tap at inlet Establish a flow equal to icceptance criteria :omplete conformance go external leakage, permanent distortion, or structural failure. 8s specified in 3.5.6 Leakage to outlet port not to exceed value permitt
38、ed by 3.5.5. No structural damage or degradation No resonant frequency 0-33 cps. No to performance. structural damage or degradation to performance. percent flow rate is reached. Valve shall have closed before 110 percent flow rate is exceeded. tial pressure not to exceed that per- mitted in 3.4.3.
39、The valve shall not close before O Trip differen- NOTES: 1. 2. 3. 4. This test not required for valves provided with automatic reset (see 3.4.ll). Shock and vibration tests are not required if the valve has been previously approved Where other values of accuracy are specified these shall be used ins
40、tead (see 3.5.1). The manufacturer siall be permitted the option of establishing the trip differential pressure for shock and vibration. separately at lower pressure-flow conditions. 4.3 mality conformance inspection. All automatic shut-off valves shall be subjected to quality confor- mance inspecti
41、on. ational test outlined in table IV. This shall consist of the visual examination, proof test, external leakage test, and oper- Any discrepancies or failures shall be corrected prior to acceptance. 4.4 Inspection of preparation for delivery. The packaging, packing and marking shall be inspected fo
42、r compliance with section 5 of this document. 5. PRFPARATION FOR DELIVERY (The preparation for delivery requirements specified herein apply only for direct Government procurements. For the extent of applicability of the preparation for delivery requirements of referenced documents listed in section
43、2, see 6.3.) 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-24374 48 9797906 0274848 9 MtL-Y-24394(sHIPs) 5.1 4.1.1 Valves. 5.1.1.1 Preservation and packaEi . beservation and packaging which may be the suppliers commercial Ikmestic shipment
44、and early equipment installation. . .* - Practice, Sukadequate protection against corrosion, deterioration and physical daipage during shipent fromthe supply source to the using activity and until early installation. rier at the lowest rate and will afford protection against physical or mechanical d
45、amage during direct ship ment from the supply eource to the using activity for early installation. The shipping containers or method of packing shall conform to the Uniform Freight Classification Rules or other carrier regulations as applicable to the mde of transportation and may conform to the sup
46、pliers commercial practice. 5.1.1.2 packing. Packing shall be accomplished in a manner which will insure acceptance by common car- 5.1.1.3 Msrking. Shipment marking information shall be provided on interior packages and exterior shipping containers in accordance with the contractors comercial practi
47、ce. nomenclature, Federal stock number or manufacturers part number, contract or order number, contractors name and destination. The information shall include 5.2 Domestic shipment and storage or overseas shipment. The requirements and levels of preservation, packaging, packing and marking for shipm
48、ent shall be specified by the procuring activity (see 6.2). 5.3 Use of polystyrene (loose-fill) msterial. 5.3.1 For domestic shipment and early equipment installation and level C packaping and packing. Unless otherwise approved by the procuring activity (see 6.2), use of polystyrene (loose-fill) mat
49、erial for domestic shipment and early equipment installation and level C packaging and packing applications such as cushioning, filler and dunnage is prohibited. When approved, unit packages and containers (interior and exterior) shall be marked and labelled as follows: “CAUTION Contents cushioned etc with polystyrene (loose-fill) material Not to be taken aboard ship. Remove and discard loose-fill material before shipboard storage. If required, recushion with cellulosic material bound fiber, fi
