1、 AMSC N/A FSC 1660 MIL-DTL-7891G 10 October 2008 SUPERSEDING MIL-PRF-7891F 22 December 1997 DETAIL SPECIFICATION FILLER VALVE, AIRCRAFT OXYGEN This specification is approved for use by all Departments and Agencies of the Department of Defense. Comments, suggestions, or questions on this document sho
2、uld be addressed to: Oklahoma City Air Logistics Center/ENSDAA, 3001 Staff Drive, Tinker AFB, OK 73145-3036 or emailed to af71tinker.af.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at http:/assist.daps.dla
3、.mil. INCH-POUND Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-7891G 2 1 SCOPE 1.1 Scope. This specification covers low pressure and high pressure aircraft oxygen filler valves. 1.2 Classification. The valves are classified as follows: Clas
4、s L - Low pressure H - High pressure Style F - Female M - Male Configuration (see figure 1, 4, 5 and 6) 1.2.1 Part or Identifying Number (PIN). The PIN is constructed as follows: M 7891 X X - X Configuration (see figure 1 through 6) Style F Female M Male Class L Low pressure H High pressure Specific
5、ation number M prefix 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 or this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples.
6、While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or 5 of this specification, whether or not they are listed. Provided by IHSNot for ResaleNo reproduction or netwo
7、rking permitted without license from IHS-,-,-MIL-DTL-7891G 3 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 specified herein. Unless otherwise specified, the issues of these d
8、ocuments are those cited in the solicitation or contract. INTERNATIONAL STANDARDIZATION AGREEMENTS AIR-STD-25/34A(1) - Aircraft Gaseous Oxygen Replenishment Connections FEDERAL SPECIFICATIONS BB-A-1034 - Compressed Air, Breathing COMMERCIAL ITEM DESCRIPTIONS A-A-59503 - Nitrogen, Technical DEPARTMEN
9、T OF DEFENSE SPECIFICATIONS MIL-PRF-25567 - Leak Detection Compound, Oxygen Systems MIL-PRF-27210 - Oxygen, Aviators Breathing, Liquid and Gas DEPARTMENT OF DEFENSE STANDARDS AN800 - Cone and Union (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch/ or from the
10、Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the s
11、olicitation or contract. AMERICAN NATIONAL STANDARDS INSTITUTE/AMERICAN SOCIETY FOR QUALITY (ANSI/ASQ) ANSI/ASQC Z1.4 - Sampling Procedures and Tables for Inspection by Attributes (ANSI documents may be obtained at www.ansi.org or from American National Standards Institute, 25 West 43rd Street, New
12、York, NY 10036.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-7891G 4 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM B117 - Salt Spray (Fog) Apparatus, Operating (ASTM documents may be obtained at www.astm.org or addressed to the A
13、merican Society for Testing and Material, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME) ASME B46.1 - Surface Texture, (Surface Roughness, Waviness, and Lay) ASME B1.1 - Unified Inch Screw Threads, (UN and UNR Thread Form) (ASME documents ma
14、y be obtained at http:/www.asme.org/ or addressed to American Society of Mechanical Engineers, United Engineering Center, 345 East 47th Street, New York, NY 10017-2392) METALS AND ALLOYS IN THE UNIFIED NUMBERING SYSTEM (UNS) UNS C36000 - Free Cutting Brass UNS C37700 - Forging Brass UNS N04405 - Ni-
15、Cu Alloy Solid Solution Strengthened (Monel R405) UNS S30200 - Austenitic Cr-Ni Stainless Steel UNS S30400 - Austenitic Cr-Ni Stainless Steel (UNS documents may be obtained at http:/www.sae.org/servlets/index or addressed to Society of Automotive Engineering, 400 Commonwealth Drive, Warrendale, PA 1
16、5096-0001) SOCIETY OF AUTOMATIVE ENGINEERS (SAE) SAE AMS3305 - Silicon Rubber, General Purpose 80 Durometer SAE AS5202 - Port or Fitting End, Internal Strait Thread SAE AS568 - O-Rings, Aerospace Size Standard For Provided by IHSNot for ResaleNo reproduction or networking permitted without license f
17、rom IHS-,-,-MIL-DTL-7891G 5 SAE AS4395 - Tube Connection, Fitting End Flared, Design Standard SAE AS5201 - Fitting End, External Taper Pipe Thread, Design Standard SAE J1926-1 - Connections for General Use and Fluid Power Ports and Stud Ends with ASME B1.1 Threads and O-Ring Sealing Part 1: Threaded
18、 Port with O-Ring Seal in Truncated Housing (SAE documents may be obtained at http:/www.sae.org or addressed to Society of Automotive Engineering, Inc., 400 Commonwealth Drive, Warrendale, PA 15096.) 2.4 Order of Precedence. Unless otherwise noted herein or in the contract, in the event of a conflic
19、t between the text of 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. REQUIREMENTS 3.1 Qualification. The valves furnished under
20、this specification shall be products that are authorized by the qualifying activity for listing on the applicable qualified products list before contract award (see 4.2 and 6.3). 3.2 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable mate
21、rials 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 cycle costs. 3.3 Materials. All materials shall be corrosion resistant or suitably treated to resist corrosion du
22、e to electrolytic decomposition, salt air, and any other atmospheric conditions that may be encountered during operational use or storage. All lubricants used shall be compatible with a pure oxygen environment and shall create no health or fire hazards (see 6.7). The use of toxic chemicals, hazardou
23、s substances, or ozone depleting chemicals (ODC) shall be avoided, whenever feasible. 3.4 Interface. 3.4.1 Safety-specific materials. All mating surfaces that are exposed to oxygen flow must resist wear from repetitive coupling and uncoupling and shall be nickel-copper alloy conforming to UNS N04405
24、. Surfaces that are exposed to oxygen flow, but are not mating surfaces, shall conform to UNS C36000, C37700, or N04405. Springs, if not directly in the oxygen flow path, may conform to UNS S30200 or S30400. Alternative materials that perform as well as, or better than these materials may be propose
25、d (see 6.4). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-7891G 6 3.4.2 Dimensions. The dimensions of low and high pressure filler valves, fittings, handles, and flanges shall conform to figures 1 through 6. 3.4.3 Valve coupling. The M7891
26、LF shall couple with the M7891LM and the M7891HM shall couple with the M7891HF. 3.4.4 M7891LF-6 plug. A plug shall couple into the M7891LF to prevent contamination from entering the valve when not in use (see figure 1). A force not less than 15 pounds shall be required to couple the plug. Coupling t
27、he plug shall not open the M7891LF. The plug shall be uncoupled by rotating the knurled retainer on the M7891LF clockwise between 10 and 45 with a torque not greater than 25 inch-pounds (in-lb). When coupled and the knurled retainer is not rotated, the plug shall withstand a separation force not les
28、s than 15 pounds. The plug shall be tethered to the valve to prevent loss. 3.4.5 M7891LM, M7891HM, and M7891HF caps. A cap shall fit over the M7891LM and M7891HM inlets and the M7891HF outlet to prevent contamination from entering the valves when not in use (see figures 4, 5, and 6). The cap shall b
29、e tethered to the valves to prevent loss. 3.5 Environmental operating conditions. 3.5.1 Temperature. The valves shall operate between -65F and 165 F (see 4.6.8). 3.5.2 Vibration. The valves shall withstand the low frequency and broadband random vibrations (functional and endurance levels) specified
30、in tables III, IV, VI, and VII while pressurized. If no resonant frequencies are found below 30 Hz, the low frequency random vibrations specified in table III and IV are not required (see 4.6.9). 3.6 Performance. 3.6.1 M7891LM and M7891HM filtration. The M7891LM shall be filtered with a sintered bro
31、nze filter with a micron rating conforming to figure 4. The M7891HM shall be filtered with a sintered brass filter with a micron rating of 20 microns. Alternative filter material that performs as well as or better than this material may be proposed (see 6.4). 3.6.2 Gas flow. 3.6.2.1 M7891LF and M789
32、1LM. The rate of gas flow through the coupled M7891LF and M7891LM shall be not less than the values specified in figure 4 with 335 pounds per square inch gage (psig) applied (see 4.6.4.1 and 6.5.4). 3.6.2.2 M7891HM and M7891HF. The rate of gas flow through the coupled M7891HF and the M7891HM shall b
33、e not less than 42.5 standard liters per minute (SLPM) (see 6.5.4) with 335 psig applied (see 4.6.4.2). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-7891G 7 3.6.3 Leakage. 3.6.3.1 M7891LF coupling and outlet. There shall be no leakage when
34、 M7891LF is pressurized to 500 psig and coupled to M7891LM that is plugged or uncoupled with the plug removed (see 4.6.5.1 and 6.5.2). 3.6.3.2 M7891LM inlet. The inlet leakage shall be no more than 1 standard cubic centimeter per hour (SCC/HR) when 500 psig is applied to the M7891LM outlet (see 4.6.
35、5.2). 3.6.3.3 M7891HM inlet. The inlet leakage shall be no more than 1 SCC/HR when 2,200 psig is applied to the M7891HM outlet (see 4.6.5.3). 3.6.3.4 M7891HM and M7891HF coupling. There shall be no leakage when M7891HM is coupled to M7891HF that is plugged and pressurized to 2,200 psig (see 4.6.5.4
36、and 6.5.2). 3.6.4 Coupling. 3.6.4.1 M7891LF and M7891LM coupling force. A force not less than 15 pounds shall be required to couple the M7891LM into the M7891LF. The M7891LM shall be uncoupled by rotating the knurled retainer on the M7891LF clockwise between 10 and 45 with a torque not greater than
37、25 in-lb (see 4.6.6.1). 3.6.4.2 M7891LF and M7891LM coupling endurance. The M7891LF and M7891LM shall withstand 1,000 cycles of coupling and uncoupling. A cycle is defined as the coupling and uncoupling of the M7891LF and M7891LM followed by the coupling and uncoupling of the M7891LF-6 plug and the
38、M7891LF (see 4.6.6.2). 3.6.4.3 M7891HF and M7891HM coupling endurance. The M7891HF and M7891HM shall withstand 500 cycles of coupling and uncoupling. A cycle is defined as the coupling and uncoupling of the M7891HF and M7891HM (see 4.6.6.3). 3.6.5 Actuation. 3.6.5.1 M7891LM opening pressure. The ope
39、ning pressure for the M7891LM shall be not greater than 15 pounds per square inch differential (psid) with a flow not less than 5.0 cubic centimeters per minute (cc/min) (see 4.6.7.1 and 6.5.3). 3.6.5.2 M7891HM opening pressure. The opening pressure for the M7891HM shall be not greater than 15 psid
40、with a flow not less than 5.0 cubic centimeters per minute (cc/min) (see 4.6.7.2 and 6.5.3). 3.6.5.3 M7891LM and M7891HM opening pressure endurance. The M7891LM and M7891HM shall withstand 1,000 cycles of opening pressure (see 4.6.7.3). Provided by IHSNot for ResaleNo reproduction or networking perm
41、itted without license from IHS-,-,-MIL-DTL-7891G 8 3.6.6 Oxygen bomb. There shall be no ignition or deterioration of any of the valve materials when subjected to a pure oxygen surge pressure of 2,600 psig for 30 seconds (see 4.6.10). 3.7 Cleanliness. All surfaces shall be free of visible particulate
42、s (50 microns and larger), free of visible fluorinated lubricants, and free of hydrocarbon contamination to a level not greater than 3 milligrams per square foot (mg/ft2) (see 4.6.3 and 6.6). 3.8 Item identification. The valves shall be permanently and legibly marked with the following information (
43、see 4.6.1, 6.2 and 6.12). a. Manufacturers identification b. Manufacturers CAGE code c. Manufacturers part number (PN) d. Part or Identification Number (PIN) (see 1.2.1, figures 1 through 6) e. Additional identification information 3.9 Interchangeability. All parts having the same manufacturers part
44、 number shall be functionally and dimensionally interchangeable (see 4.6.1). 4. VERIFICATION 4.1 Classification of inspections. The inspection requirements specified herein are classified as follows: a. Qualification inspection (see 4.2) b. Conformance inspection (see 4.3) 4.2 Qualification inspecti
45、on. Qualification inspection shall be performed on a minimum of two valves and shall include all the tests specified in 4.6. 4.3 Conformance inspection. Conformance inspection shall include the tests specified in 4.3.1 and 4.3.2. 4.3.1 Individual tests. The valves shall be subjected to the tests as
46、follows: a. Examination (see 4.6.1) b. Leakage (see 4.6.5) 4.3.2 Sample tests. In addition to the tests specified in 4.3.1, the valves shall be sampled in accordance with ANSI/ASQC Z1.4 at the inspection level (normal, tightened, or reduced) in the acquisition document (see 6.2 and 6.8). The sample
47、of valves shall be subjected to the following tests: a. Dimensions (see 4.6.2) b. Gas flow (see 4.6.4) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-7891G 9 c. Coupling (see 4.6.6) 4.4 Inspection conditions. 4.4.1 Temperature and pressure.
48、Unless otherwise specified in the individual test descriptions, tests shall be conducted at ambient temperature and pressure. 4.4.2 Test medium. The gas used for testing shall be oxygen conforming to MIL-PRF-27210, Type I. Compressed air conforming to BB-A-1034 Grade A or C or nitrogen conforming to A-A-59503, Type I, Grade A, Class 1 may be used in lieu of oxygen unless otherwise specified in the individual test descriptions. 4.5 Requirements cross-reference matrix. Table I provides a cross-reference matrix of the section 3 requirements tested or verified
