1、MIL-PRF-8622C 9999906 2029668 407 MIL-PRF-8622C 27 Januarv 1997 SUPERSEDING 1 October 1982 MS22012D 20 November 1969 MIL-V-8622B PERFOR.hL4NCE SPECIFICATION LLZ. HIGH-PRESSURE OXYGEN CYLINDER AUTOMATIC OPENING This specification is approved for use by all Departments and Agencies of the Department o
2、f Defensc 1. SCOPE 1 1 Scope This specification covers the requirements of an automatic opening cylinder valve for use in aircraft high-pressure oxygen systems. 2 APPLIC.4BLE DOCUMENTS 2 1 General The documents listed in this section are specified in sections 3 and 4 of this specification This secti
3、on 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 all specified requirements documents cited
4、in sections 3 and 4 of this specification, whether or not they are listed 2.7 Government documents. Beneficial comments (recommendations, additions, deletions) and any pertinent data which ma!. he of use in improving this document should be addressed to: Commander, Naval Air arfare Center .4ircrafi
5、Division, Code 4141 OOB 120-3, Highway 547, Lakehurst, NJ OS73 3-5 1 OO. by using the Standardization Document Improvement Proposal (DD Form 1436) appearing at the end of this document or by letter. .-2ISC N,X FSC 4820 DI STRIBLTTION STATEMENT A. Approved for public release; distribution is unlimite
6、d. Licensed by Information Handling ServicesMIL-PRF-b22C m 99999Ob 2029bb9 343 9 MIL-PR.F-8622C 5 L 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 issu
7、es 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 6.2d) SPECIFICATIONS DEPARTMENT OF DEFENSE MIL-0-272 1 O - Oxygen, Aviators Breathing, Liquid and Gas MIL-T-27730 - T
8、ape, Antiseize, Tetrafluoroethylene with Dispenser h4IL-G-276 1 7 Grease, Aircraft and Instrument, Fuel and Oxidizer Resistant ST.W D ARD S FEDERPLL FED-STD-H28 - Screw Thread Standards For Federal Services DEPXRThENT OF DEFENSE h1IL- STD- 1 3 O hIIL-STD-889 - Dissimilar Metals - Identification Mark
9、ing of U. S. Military Property hfIL-STD-1359 - Cleaning Methods and Procedures For Breathing hlS243 92 - Nipple, Tube, Precision Type hlS 16624 - Ring, Retaining, External, Basic (Taper Section Oxygen Equipment Type) .UR FORCE - NAVY AERONAUTICAL AN818 Nut Tube Coupling, Short (Unless otherwise indi
10、cated, copies of the above specifications and standards are available from the Standardization Documents Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 191 11-5094.) 2.3 Non-Government Dubiications The following documents form a part of this document to the extent specified herein. Un
11、less otherwise specified, the issues of the documents which are DoD adopted are those listed in the issue of the DoDISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DoDISS are the issues of the documents cited in the solicitation (see 6.2). 2 Licen
12、sed by Information Handling ServicesNIL-PRF-b22C 9999906 2029670 Ob5 = MIL-PRF-8622C AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME) ASME - B46.1 - Surface Texture (Surface Roughness, Waviness, ASPLIE - Y14.5 - Dimensioning and Tolerancing and Lay) (DoD adopted) (.4pplication for copies should be ad
13、dressed to the American Society Of Mechanical Engineers, 345 East 47th Street, New York, NY 10017.) AhERICkN NATIONAL STANDARD NSTITUTE (ANSI) ANSI- z 1.4 - Sampling Procedures and Tables for Inspection by Attributes (DoD adopted) (Application for copies should be addressed to American National Stan
14、dard Institute, 11 +est. 12nd Street. New York, NY 30036.) A3fERICAN SOCIETY FOR TESTING Ah? MATERIALS (ASThl) ASThl-D 1 149 ASThl-G63 - Rubber Deterioration, Surface Ozone Cracking in a Chamber Standard Test Method for (DoD adopted) Nonmetallic Materials for Oxygen Service Standard Guide for Evalua
15、ting Temperature of Liquids and Solids in a High Pressure Oxygen Enriched Environment Metals for Oxygen Service, Standard Guide for Evaluating (Application for copies should be addressed to the American Society for Testing and .4SThl-G72 - Standard Test Method For Autogeneous Ignition ASThI-G94 Alat
16、erials 1 O0 Barr Harbor Drive, Philadelphia, PA 19103.) 2 4 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein, the text of this specification takes precedence. Nothing in this document, hove.er, supersedes applicable laws and regul
17、ations unless a specific exemption has been obtained 3 REQUIREhfENTS 3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.2. 3 2 hlaterials Materials used shall be selected from the applicable government or non- - Licensed by Infor
18、mation Handling ServicesMIL-PRF-b22C 999990b 2029673 TTL = MIL-PRF-8622C Government specifications and standards. Materials selected shall be compatible with oxygen fluid and shall meet the requirements of this specification. 3 3 1 hietal parts All metal parts shall be of corrosion-resistant materia
19、l or treated to resist to corrosion Material for metal parts shall be selected in accordance with ASTM-G94 for oxygen compatibility of metals 3.2 1 . 1 Dissimilar metals. Unless protected against electrolytic corrosion, dissimilar metals shall not be used. The dissimilar metais shall be in accordanc
20、e with MIL-STD-889. 3 2.2 Nonmetallic materials. Nonmetallic materials that are adversely affected by continued use nith oxygen shall not be used. Material for nonmetallic parts shall be selected in accordance with ASThl-G63 for oxygen compatibility of nonmetallic materials. Nonmetallic parts, wette
21、d by oxygen. shall be resistant to auto-ignition, and shall have the lowest practicable heat of combustion in accordance with ASTM-G63. Additionally, where nonmetallic parts are installed, the design shall minimize the surface area and volume exposed to oxygen. 3 2 2 1 .4rre control. Because of the
22、mechanical properties of elastomer are sensitive to temperatures. elastomer components except silicones shall be treated for protection from the en.ironmental conditions such as moisture and extreme temperatures. The integral elastomer components shall be operable throughout the life of the valve. T
23、he shelf life of the elastomer components shall be determined by the acquisition activities (see 6.2). 3 2 2 3 Elastomer components Elastomer components shall be composed of an ozone-resistant composition lvhich shall not swell and shall meet the ozone-resistant requirements specified herein (see 4.
24、5.12). 3 2.3 Protective treatment of materials. Materials used shall be protected against environmental deterioration Protective coatings that may crack, chip, or scale during normal service life or under extreme environmental conditions shall not be used. 3.2.4 Surface finish. Ail machined surfaces
25、 shall be smooth. free of pits and discontinuities; such as, scratches or breaks and shall be uniform in appearance. Surface roughness shall be in accordance with ASME-B46. i. 3.2 5 Lubricants. Lubricants shall not be used within the normal flow path of oxygen. Lubricants shall be in accordance with
26、 MIL-G-27617, Type III and shall have been tested for compatibility with gaseous oxygen in accordance with ASTM-G72. 3 -3 Recvcled. recovered. or environmentallv preferable materials. Recycled, recovered, or en.ironmentally preferable materiais shall be used to the maximum extent possible provided t
27、hat the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. -3 3 Design and interface requirements. The design and interface requirements of the valve shall 4 Licensed by Information Handling ServicesMIL-PRF-Bb22C = 9999906
28、 2029672 938 1 I Valveassembly MIL-PRF-8622C Figure 1 be as specified in 3.4.1 through 3.4.10. The construction of the valve shall be such that it opens automatically when the coupling nut is connected to the valve outlet and closes automatically lvhen disconnected. 3 4 3.4 1 Outlet. The valve outle
29、t port shall be provided with a protective device for protecting threads and preventins entrance of contaminants. Coupling nut Figure 3 Cylinder valve Figure 4 -3.4 2 Siphon tube. The valve shall be provided with a siphon tube or similar device to prevent any contaminants within the cylinder from be
30、ing carried into the valve. 3 4.3 Safety features alves shall be provided with a safety outlet which shall connect directly uith a valve inlet. The safety outlet shall include means for rapid pressure dumping. 3.4.4 Valve assembly. The valve assembly shall consist of a valve and a coupling assembly.
31、 The dimensions. physical characteristics, and interface requirements of the valve assembly and integral components shall be in accordance with table I. Table I. Dimensions and configurations of the valve assemblv and integral comuonents. I 2 I Noseadapter I Figure 2 I -3 3 5 Couplinc assembly. The
32、coupling assembly shall consist of a nose adapter, a coupling nut, a packing ring and an MS 16624 retaining ring 3.4.6 Check .al.e. The valve shall incorporate a check valve or similar device to prevent oxygen leakage xvhen the nose adapter is uncoupled from the valve. 3 4 7 Antiseize taue. Polytetr
33、afluorotheylene tape shall be used on ali pipe thread fittings. The tape shall be applied in accordance with the applicable instruction of MIL-T-27730 to minimize potential contamination of the breathing oxygen systems and provides an adequate seal. Tape shall not be used on flare tube fitting, stra
34、ight threads coupling sleeves, or outside of tube flares. -3 3 S Cleanliness Prior to assembling the valve and its subassemblies, all internal and external surfaces shall be cleaned in accordance with MIL-STD-1359 to ensure that the valve is free of any cont aminat ion. 3 4.9 Threads To be interface
35、d with the valve assembly installed in the aircraft oxygen systems, screw threads and pipe threads used in construction of valves shall be in accordance with 5 Licensed by Information Handling ServicesMIL-PRF-8622C = 9999906 2029673 874 MIL-PRF-8622C , applicable FED-STD-H28 (see figures 1,3, and 4)
36、. 3 4 1 O Dimensionine and tolerancinq. Dimensioning and tolerancing of the valve shall be in accordance with ASME - Y 14.5. 3 5 Performance 3 5 i Leakage The valve shall not leak more than 2 milliliters (mi) per minute when tested as specified in 4.5.2 -3.5.2 Pressure drop. The pressure drop across
37、 the valve shall be not greater than 5 psig when tested as specified in 4.5.3. 3 5.3 Proof pressure. The proof pressure of the valve shall not leak more than 2 ml per minute Lvhen tested as specified in 4.5.4. 3 5.4 High temperature operation. The valve shall not show any evidence of mechanical or m
38、aterial failure after being stabilized and tested as specified in 4.5.5. 3 5 S Loif. temperature operation. The valve shall not show any evidence of mechanical or material failure after being stabilized and tested as specified in 4.5.6. i 5 6 Ibration The vahve shall not show any evidence of mechani
39、cal or material failure after tested as specified in 4.5.7. 3 S 7 Endurance The valve shall not show any evidence of mechanical or material failure after tested as specified in 4.5.8. 3.5.8 Torque. 3.5,s. 1 Opening The valve shall open fully when tested as specified in 4.5.9.1. The flow rate of valv
40、e at fully open position is 50-65 liters per minute. 3.5.8.2 Sealing. The valve shall not leak in excess of 2 ml per minute when tested as specified in 3.5.9.2. 3 5 9 Check valve The check valve shall not leak in excess of 2 ml per minute when tested as specified in 4 5.1 O 3 5 1 O Safety disk ruptu
41、re The safety disk shall rupture between 2,700 and 3,000 psig when tested as specified in 4.5. i 1. 3 5 1 1 Ozone resistance. The elastomer components used shall be resistant to ozone. The elastonier components shall not show any evidence of cracking or damage when tested as specified in 4.5 12. 6 L
42、icensed by Information Handling ServicesMIL-PRF-bZZC 9999906 2029b74 700 MIL-PRF-8622C -3.5.12 Oxvrren test. 3.5.12 1 Oxygen ignition. The nonmetallic material and valve shall not ignite and there shall be no evidence of charring or deterioration when tested as specified in 4.5.13. 3.5.12.2 Oxvaen p
43、urge. The valve shall not ignite and there shall be not any evidence of charring or deterioration when tested as specified in 4.5.13.2. -3 5.13 Disassembly and examination. The valve shall show no evidence of deterioration or wear due to testins that will affect the valve performance when examined a
44、s specified in 4.5.14. 3.6 Interchanaeabilitv. - All parts having the same manufacturers part number shall be interchangeable functionally and dimensionally. 3.7 Ueieht. The total weight of the valve assembly, exclusive of the outlet cap, shall be not greater than 13 ounces. 3 8 Identification of pr
45、oduct. The valves shall be marked for identification in accordance with hlIL-STD-130 except that the national stock number shall be omitted. 3 9 Supersedinc -. part numbers. This valve assembly supersedes the MS22012 valve assembly. The new part numbers which supersedes the corresponding old MS part
46、 numbers are as shown in table 11 3.1 O UorknianshiD. The valves shall be uniform in quality and shall be free from irregularities, defects or foreign material which could adversely affect safety, performance, reliability, or durabilit!,. 1 ERIFICXTION 4.1 Classification of inspections. The inspecti
47、on requirements specified herein are classified as fol1 f.: a. First article inspection (see 4.2) b. Conformance inspection (see 4.3) 4 2 First article insDection First article inspection consists of examination and test of the production item after award of a contract to determine the production it
48、em conforms to the requirenients of this specification. First article inspection shall consist of all examinations and tests of this specification. 4 2.1 First article samples. Unless otherwise specified (see 6.2), the manufacturer shall submit 4 .al.es and 6 elastomer test slabs, 5 inches by 6 inch
49、es by 0.075 inch, composed of identical ozone-resistant composition and cure that was used in manufacturing the elastomer components. 7 Licensed by Information Handling ServicesMIL-PRF-b22C = 9999906 2029675 647 Coupling assembly Nose adapter Coupling nut MIL-PRF-8622C The samples shall be representative of the construction, workmanship, components, and materials to be used during production. Approval of the first article inspection samples or the waiving of the first article inspection does not exempt the test requirements for performing the conformance insp
