1、I METRIC I MIL-PRF-6267 1 A(AT) 13 December 1996 SUPERSEDING 22 April 1993 MIL-V-6267 1 (AT) PERFORMANCE SPECIFICATION VALVE, BYPASS, FUEL, MECHANICAL This specification is approved for use by the U. S. Army Tank-automotive and Armaments Command, Department of the Army, and is available for use by a
2、li Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers a mechanical fuel bypass valve, herein referred to as “the assembly”. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specificat
3、ion. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet aii specified requirement do
4、cuments cited in sections 3 and 4 of this specification, whether or not they are listed. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: U.S. Army Tank-automotive and Armaments Command, ATTN: AM
5、STA-TR-EBLUE, Warren, MI 48397-5000, by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document, or by letter. AMSC NIA FSC 4820 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo repr
6、oduction or networking permitted without license from IHS-,-,-flIL-PRF-62673A m 9999906 2026396 095 W MIL-PRF-6267 1 A(AT) 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent speci
7、fied herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DoDISS) and supplement thereto, cited in the solicitation (see 6.2). SPECIFICATIONS FEDERAL A-A-52557 - Fuel Oil, Diesel; For Posts
8、, Camps and Stations. DEPARTMENT OF DEFENSE 1MLC-7024 - Calibrating Fluids, Aircraft Fuel System Components. STANDARDS DEPARTMENT OF DEFENSE MIL-STD-8 1 O - Environmental Test Methods and Engineering Guidelines. (Unless otherwise indicated, copies of the above specifications, standards, and handbook
9、s are available from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 191 11-5094.) 2.2.2 other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent
10、specified herein. Unless otherwise specified, the issues are those cited in the solicitation. DRAWINGS DEPARTMENT OF DEFENSE 1232473 6- 1 12324795 - Electromechanical Fuel System Assembly. - Valve, Bypass, Fuel, Mechanical. (Copies of these drawings are available fi-om the U.S. Army Tank-automotive
11、and Armaments Command, ATTN: AMSTA-TR-EBLUE, Warren, MI 48397-5000.) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-PRF-62673A D 9999906 2026397 T23 MIL-PRF-6267 1 A(AT) 2.3 Order of precedence. In the event of a conflict between the text of
12、this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3.1 First article. When specified (see 6.2) a sample shall be subjected to rst artic
13、le inspection in accordance with 4.2. 3.2 Materials. Materials used shall be in accordance with the manufacturers materiais specifications for the valve assemblies. The materials shall be capable of meeting all of the operational and environmental requirements specified herein (see 4.4.1). 3 2.1 Rec
14、vcled. recovered, or environmentallv preferable materiais. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life
15、cycle costs. 3.2.2 Corrosion control. The assembly shall be fabricated fkom materiais that are inherently corrosion resistant or are permanently treated to prevent forms of corrosion and deterioration which affect system performance (see 4.4. i). 3.3 Desim and construction. The assembly shall confor
16、m to the manufacturers design and construction except for the envelope dimensions; port hole dimensions, locations, and depth; lever swing radius and location; and mounting dimensions which shall conform to Drawing 12324795 and other applicable drawings. 3.3.1 Interchangeabilitv. Au assemblies shall
17、 be interchangeable as to fit, form, and function with other manufacturers assemblies having the same military part number. 3.3.2 Weiht. The weight of the assembly shall be from 0.73 to 1.04 kilograms (kg) (1.6 to 2.3 pounds) (see 4.4.3). 3.4 Performance. Unless otherwise specified (see 6.2), perfor
18、mance test shall be conducted with the valve plumbed as shown in figure 1. 3.4.1 Valve schedule. The assembly shall meter servo fuel flow (PR) and nozzle fuel flow (PN) based on A-A-52557, Grade DF-2 diesel fel oil at a specific gravity of 0.84 and a temperature of 15 to 21 degrees Celsius (“C) 60 t
19、o 70 degrees Fahrenheit (OF). PR and PN 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-62b7LA 0b 202b198 968 M Position 30“ 40“ 50“ 60“ 70 MIL-PRF-6267 1 A(AT) PR flow PN flow Minimum Actual Maximum Minimum Actual Maximum 79 100 132 228 79
20、 1 O0 252 348 79 1 O0 3 72 468 79 1 O0 460 500 79 100 460 500 schedule sha be flow tested using ME-C-7024, type II calibrating fluid. The DF-2 fuel flow schedule on Drawing 12324795 may be converted to a schedule for MIL-C-7024, type II calibrating fluid by using the foilowing formula based on speci
21、fic gravity (Sp. Gr.) (see 4.4.4.1): Fuel flow rate MIL-C-7024, type II = a x Fuel flow rate DF-2 (pph). pounds per hour ph) kilogram per hour (kgh) 3.4.1.1 PR cracking ande and flow schedule. The PR port shall begin to flow (crack open) at an operating lever angle of 7 to 13 degrees. The PR crackin
22、g angle test shall be performed with P1 inlet minus PR port outlet pressure equal to 19 psid. a. Metered flow. The assembly shall meter PR flow with 19 psid (Pi inlet minus PR outlet) and P1 equal to 500 psig, in accordance with the following: (1) Minimum 67 pph when the PN valve system cracks open.
23、 (2) As specified in the metered flow table, section 3.4.1.2. 3.4.1.2 PN cracking ande and flow schedule. The PN port shall begin to flow (crack open) at an operating lever angle of 11 to 19 degrees. The PN cracking angle test shall be performed with P 1 minus PN port pressure equal to 150 psid. a.
24、Metered flow. The assembly shall meter PR flow with 150 psid (P 1 inlet minus PN outlet) and P1 equal to 500 psig, as specified in the metered flow table I. 3.4.2 Proof pressure. Assembly components shall show no evidence of failure, permanent set, or damage when subjected to a gage pressure of 10.3
25、4 megaPascals (MPa) 1500 pounds per square inch (psi) (see 4.4.4.2). 3.4.3 Leakage. Maximum PR or PN port leakage and PR to PN cross port leakage at closed position (handle = O“) shall be 0.5 milliliters per minute (mL/min). There shall be no evidence of external leakage (see 4.4.4.3). 4 Provided by
26、 IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. MIL-PRF-62671A(AT) Segment Frequency Function Level no. F) (P A) (fi Pk-Pk) (g-pk) 1 5 A - 1.00 2 25 D 30.00 - 3 51 A - 4.00 4 300 A - 1.70 5 500 1.70 3.4.4 Handle torque. The torque required to operate the asse
27、mbly through its rotational range fiom either direction (Oo to 70, 70 to 0) shall not exceed 0.9 Newton-meter (N-m) (8 inch-pounds) ( see 4.4.4.4). . 3.5 Environmental conditions. 3.5.1 Temperature. The assembly shail meet the requirements of 3.4.3 (port leakage only) during exposure, and 3.4 after
28、exposure to temperatures ranging from -51 to +121C (-60 to +250F) (see 4.5.1). 3.5.2 Fungus. The assembly shall not support fungus growth and shall meet the performance requirements of 3.4 (see 4.5.2). 3.5.3 Vibration. The assembly, when Crtured as an integral part of Hydromechanical Fuel Control As
29、sembly 12324736-1, shall meet the requirements of 3.4.3 (port leakage only) during exposure, and 3.4 after exposure to the peak vibration envelope defined in table II and figure 2 in each of three mutualiy perpendicular Fes, at a logarithmic sweep rate of 15 minutes from 5 to 500 to 5 Hertz (Hz) (se
30、e 4.5.3). 3.5.4 Shock. 3.5.4.1 Basic shock. The assembly shall meet the requirements of 3.4 after exposure to shock impulses of 20 $1 2 g for 18 i 1.8 milliseconds (ms) half sine wave in each direction of three mutually perpendiculir axes (see 4.5.4.1). 3.5.4.2 Gun firing shock. The assembly shall m
31、eet the requirements of 3.4 after exposure to shock impulses in each direction of three mutually perpendicular axes shown in figure 5. Gun fjring shock levels shall be defined by the shock response spectra shown in figures 6,7, and 8 for the vertical, axial, and lateral directions respectively (see
32、4.5.4.2). 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-6267LA D 9999906 2026200 346 P 3.5.4.3 Ballistic shock. The assembly shall meet the requirements of 3.4 after exposure to shock impulses in each direction of the three mutually perpe
33、ndicular axes shown in figure 5. Ballistic shock levels shall be defined by the shock response spectra shown in figures 9,10, and 11 for the vertical, axial, and lateral directions respectively (see 4.5.4.3). 3.5.5 Sand and dust. The assembly shall meet all of the performance requirements of 3.4 aft
34、er exposure to a sand and dust environment as specified in 4.5.5. 3.5.6 Operation. The assembly shall be capable of extended operation with the handle in the full closed position (O“). The torque required to rotate the handle, after extended operation with the handle in the I I I III 1 o 1 O0 Freque
35、ncy (EL) 1000 FIGURE 6. Gun firing shock-vertical. 21 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-PRF-bZb71A _ _- _. _ . _ . _ . _ . _ 9799906 2026216 703 9 1 MD;-PRF-6267 1 A(AT) I I I I I 11111 I I I I I I1111 I I I I I III t I /- . . . loo
36、 i t /i &. 1 10 100 Frequency (Hz) 1000 FIGURE 7. Gun firing shock-axid. 22 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-PRF-62671A i- .,., - - - 9999906 202b217 b4T MIL-PRF-6267 1 A(AT) + . : . : _L i. . 100 =: : : : : : : : : : : : - - - .
37、. _ . _ . - . 10 _I _ . - . - - - . - . _- . 1 I 1 I I I I IlII I I I I I I1111 I I I I I II I I I I I I I1.II I 1 I I I1111 I 1.1 I II 1 10 1 O0 Frequency (Hz) 1000 FIGURE 8. Gun firine, shock-lateral. 23 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-
38、,-,-HIL-PRF-62b73A = 777990b 2026238 5Bb 1 MIL-PRF-6267 1 A(AT) I I I I I I1111 I I I I I I1.111 1 O00 _. . -i L .,. _ - . - Frequency (Hz) +-“+ 1000 FIGURE 9. Ballistic shock-vertical. 24 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-PRF-6267
39、1A = 9999906 2026219 412 9 MIL-PFS-6267 1 A(AT) 1000 100 n Po W 10 1 1 . . . . . . . 7 . . . / . . /i . / . / .f. . : . : . . . . 1.,. / . . . I 1 1 I I I I111 1 I I I I I1111 I 1 IlIII I 1 I I 1 I IlII I I I I 11111 I I 11 III 10 1 O0 Frequency (Hz) 1000 FIGURE 10. Ballistic shock-axial. 25 Provide
40、d by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-PRF-6267LA 9999906 2026220 L34 m MIL-PRF-6267 1 A(AT) . . I . L. + . + . i . : . ./. . + . O0 10 1 . + + . . . I . .,. . . . . I . . . . . . . . . . . . . . . . . I- I I I I I I I1111 1 I I I I I Ill I I
41、IIIII I I I I11111 I I I I I III I I III 10 1 O0 1000 Frequency (Hz) 10 O00 FIGURE 1 1. Ballistic shock-lateral. 26 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-PRF-b2673A m 9999706 2026223 070 m tf MIL-PW-6267 1 A(AT) t. 1 Inch c 5 . J .i .
42、3 J Brazed Plug FIGURE 12A. Two bolt flange fitting with a brazed DIU to Drevent pressurization of the HM and addition of a small feeder line. FIGURE 12B. An 815-8s fitting with a brazed plus to prevent pressurization of the HM. 27 Provided by IHSNot for ResaleNo reproduction or networking permitted
43、 without license from IHS-,-,-MIL-PRF-6267 1 A(AT) “$-A (o v1 I 8 I- 28 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. MIL-PRF-6267LA Custodian: Army - AT 9799906 2026223 943 = MIL-PRF-6267 1 A(AT) Preparing Activity: Army - AT (Project 4820-0688) 29 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
