1、MIL-V-5027D 48 W 7777706 0270581 8 W c-2 7-6/ MIL-V- 502 7D 12 fk!Ch, 1966 Superseding 28 January 1966 MIL-V-8620A (Aer) 9 January 1959 MIL-V-5027C MILITARY SPECIFICATION VALVES, CHECK, OXYGEN, HIGH PRESSURE This specification has been approved by the Department of Defense and is mandatory for use b
2、y all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope - This specification covers high-pressure oxygen check valves. 1.2 Classification - The high-pressure oxygen check valves shall be of the following types, and of the following styles, as specified (see 6.2): Type I - wit
3、hout spring-loaded check Type II - with spring-loaded check Type I, Style A B (cone) C D E F G Type II, Style B (flareless) An or MS Standard Single check, tube-to-tube . AN6014 Dual check AN6015 Dual check AN6016 Dual check AN6017 Cross check AN6018 Single filler check, tube-to-tube MS22 03 5 Dual
4、filler check MS22035 Dual check MS90338 2. APPLICABLE DOCUMENTS 2.1 The following documents, of the issue in effect on date of invitation for bids or request for proposal, form a part of this specification to the extent specified herein. THIS DOCUMENT CONTAINS PAGES. -EFiZl. 1 , Provided by IHSNot f
5、or ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-5027D LJ W 7779706 0270582 T W MIL -V-5 02 7D SPECIFICATIONS Federal 0-T-236 : 0-T-634 NN- P-5 3 O TT-W-572 PPP-B-591 PPP-B-601 PPP-B-621 PPP-B-636 PPP-B-640 PPP-T-60 Military MIL-P-116 MIL-F-22191 MIL-0-27210 MIL-T-
6、2 7 7 30 STANDARDS Miiitary MIL-STD-1 O 5 MIL-STD-129 MIL-STD-130 MIL-STD-794 MS22035 Tetrachloroethylene (Perchloroethylene), Technical Grade Trichloroethylene, Technical Plywood, Flat Panel Wood-Preservative, Water Repellent Boxes, Fiberboard, Wood-Cleated Box, Wood, Cleated-Plywood Box, Wood, Nai
7、led and Lock-Corner Boxes, Fiberboard Boxes, Fiberboard, Corrugated, Triple Wall Tape; Pressure Sensitive Adhesive, Waterproof-For Packaging and Sealing Preservation, Methods of Films, Transparent, Flexible, Heat Sealing for Packaging Applications Oxygen, Aviators Breathing, Liquid and Gas Tape, Ant
8、iseize, Tetrafluor oethylene , with Dispenser Sampling Procedures and Tables for Inspection by Attributes Marking for Shipment and Storage Identification Marking of US Military Property Part and Equipment, Procedure for Packing and Packing of Valve, Check, Oxygen, High Pressure, Filler Connection .-
9、 2 c Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-5027D MS33 586 Metals, Definition of Dissimilar MS 903 3 8 Valve, High Pressure Oxygen Check, Flareless Ends Air Force-Navy Aeronautical AN815 Union, Flared Tube AN818 Nut - Coupling AN6014 A
10、N601 5 AN6016 AN6017 AN6018 Valve - High Pressure Oxygen Check, Style A Valve - High Pressure Oxygen Check, Style B Valve - High Pressure Oxygen Check, Style C Valve - High Pressure Oxygen Check, Style D Valve - High Pressure Oxygen Check, Style E (Copies of specifications, standards, drawings, and
11、publications required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) 22 Other publications - The following documents form a part of this specifi- cation to the extent specified herein. Unless o
12、therwise indicated, the issue in effect on date of invitation for bids or request for proposal shall apply. National Bureau of Standards miblication Handbook H28 Screw-Thread Standards for Federal Services (Application for copies should be addressed to the Superintendent of American Society for Test
13、ing Materials Standard D1149 Method of Test-for Accelerated Ozone Cracking of Vulcnized Rubber (Application for copies should be addressed to the American Society Documents, Government Printing Office, Washington, D.C. 20402 .) for Testing Materials, 1916 Race Street, Philadelphia, Pennsylvania 1910
14、3.) 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-5027D 48 = 7799906 O270584 3 = MIL-V-5027D 3. REQUIREMENTS 3.1 Qualification - The valves furnished under this specification shall be a product which has been tested, and passed the qualific
15、ation tests specified herein, and has been listed on or approved for listing on the applicable qualified products list. 3.2 First article - The valves furnished under this specification shall be a product which has been inspected and passed the first article inspection specified herein. 3.3 Material
16、s - Materials shall conform to applicable specifications and shall be as specified herein and on applicable drawings. Materials which are not covered by specifications, or which are not specifically described herein, shall be of the best quality, of the lightest practicable weight and suitable for t
17、he purpose intended. 3.3.1 Metal parts - All metal parts shall be of a corrosion-resistant material or treated in a manner to render them adequately resistant to corrosion. 3.3.1.1 Dissimilar metals - Unless suitably protected against electrolytic corrosion, dissimilar metals shall not be used in in
18、timate contact with each other. Dissimilar metals are defined in MS33586. 3.3.2 Nonmetallic materials - Any nonmetallic material that is adversely affected by continued use with oxygen shall not be used. 3.3.2.1 Age - Elastomer components, except silicone, shall not be more than 12 months old from t
19、he cure date of manufacture to the date of delivery to any Govern- ment Service or to any airframe or accessory manufacturer. 3.3.2.2 Elastomer components - The elastomer components shall be com- posed of an ozone resistant composition, which shall not bloom, and shall meet the specified ozone-resis
20、tance performance requirements. 3.3.3 Protective treatment - When materials are used in the construction of the valve that are subject to deterioration when exposed to environment conditions likely to occur during service usage, they shall be protected against such deterioration in a manner that wil
21、l in no way prevent compliance with the performance. 3.4 Design and construction - The design and construction of the valves shall be in accordance with the applicable AN or MS standards specified in the contract or order (see 6.2). 3.4.1 Types I and II - 3.4.1.1 Flow direction - Oxygen shall flow i
22、n the direction of the arrows as shown on the applicable drawings and shall be checked in the opposite direction. i) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-5027D 4 = 9999906 0270585 5 = MIL-V-502 7D 3.4.1.2 GrippinP surfaces - If the v
23、alves are constructed in parts, each individual external part of the valves shall have a hexagonal surface or flats to serve a8 wrench-gripping surfaces. Adjacent to every thread of external connec- tions, there shall be either a hexagonal surface or flats to serve as wrench-gripping surfaces. 3.4.1
24、.3 Threads - Thread shall conform to Handbook H28. 3.4.1.4 Antiseize tape - Antiseize tape shall be used on all male pipe thread fittings. Antiseize tape shall conform to and shall be applied as specified in MIL-T-27730. Tape shall not be used on flare tube fitting straight threads, coupling sleeves
25、, or on the outer side of tube flares. None of the tape shall be allowed to enter the inside of a fitting. 3.4.1.5 Degreasing - All internal parts of the valve shall be degreased using a vapor phase degreaser in accordance with 0-T-236 or 0-T-634. Ultra- sonics may be used in conjunction with vapor
26、phase degreasing for the cleaning of components. After completion of the cleaning and when assembled, General Electric Type H Leak Detector or equivalent Halide testing apparatus shall be used to deter- mine the absence of the cleaning compound. 3.4.l.6 Orientation - The valve shall operate as speci
27、fied herein when mounted in any position (see 4.6.4). 3.4.2 Tvpe- 3.4.2.1 Fiiter - An oxygen filter shall be installed in styles F and G to remove all foreign particles, larger than 65 microns, from the oxygen prior to passing through the check valve. Provisions shall be made for removal and re- pla
28、cement of the oxygen filter unit to facilitate cleaning. 3.4.3 TvPe II - 3.4.3.1 . Poppet assemblv - The valve shall incorporate a spring-loaded poppet or some other means to assure positive closing under all pressure and flow conditions when oriented in any position. 3.5 Performance - 3.5.1 Crackin
29、g pressure (t.me ID - The valve, when tested as speci- fied in 4.7.2, shall require a pressure of at least 5 pounds per square inch gage (psig) but not more than 15 psig to open the valve check. Reset pressure (type II) - The valve check, when tested as specified in 4.7.3, shall completely stop the
30、flow of gas when the pressure is reduced to a range of from 4 psig to 14 psig. 3.5.2 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-V-5027D 48 7777706 0270586 7 MIL-V-5027D 3-5.3 Flow check leakage - 3.5.3.1 Tvpe I - The valve, when tested as
31、 specified in 4.7.4, shall not II - The valve, when tested as specified in 4.7.4, shall not Body leakave - The valve, when tested as specified in 4.7.5, permit leakage in excess of 50 cc per minute. permit leakage in excess of 2 cc per minute. 3.5.4 shall not show any evidence of leakage. 3.5.5 Pres
32、sure drop - 3.5.5.1. 3.5.3.2 Tve I - The pressure drop across the valve, when tested as specified in 4.7.6, shall not exceed 15 psig. 3.5.5.2 Me II - The pressure drop across the valve, when tested as specified in 47.6, shall not exceed 22 psig. 3.5.6 HiFh temperature - The valve, after being condit
33、ioned as speci- fied in 4.7.7, shall pass the specified tests. 3.5.7 Low temperature - The valve, after being conditioned as speci- fied in 4.7.8, shall pass the specified tests. 3.5.8 not show any evidence of mechanical or material failure and shall pass the speci- fied tests. Vibration - The valve
34、, when tested as specified in 4.7.9, shall 3.5.9 Endurance - The valve, when tested as specified in 4.7.10, shall pass the specified tests. 3.5.10 Simulated system char6thn (tvp e II) - The valve, when tested as specified in 4.7.11, shall show no evidence of adverse effects due to testing and shall
35、pass the specified tests. 3.5.11 Ozone-resistance - The test slabs, when tested as specified in 4.7.12, shall not show any evidence of checking, cracking, or damage. 3.5.12 specified- in 4.7.13, shall not ignite and there shall not be any evidence of charring or deterioration. 3.5.13 specified in 4-
36、7-14, shall not show excessive evidence of deterioration or wear due to testing which might affect the valve performance. Oxvgen bomb - The test material and valve, when tested as Disassembly and examination - The valve, when examined as - 6 o Provided by IHSNot for ResaleNo reproduction or networki
37、ng permitted without license from IHS-,-,-c? MIL-V-5027D 48 m 7777706 0270.587 7 m A AN6014 6 B (cone) AN6015 8 B (flareless) MS90338 8 c AN6016 7 D AN6017 6 E AN6018 8 F MS22035 8 ,G MS22035 9 MIL-V-5027D 3.6 Interchangeability - All parts having the same manufacturer Is part number shall be functi
38、onally and dimensionally interchangeable. 3.7 Weight - The:weight of each style valve shall be as specified in Table I. TABLE I. Valve weights I Weight maximum AN or MS I 1 standards (ounces) I 3.8 Identification of product - The valves shall be marked for identification in accordance with MIL-STD-1
39、30, except that the Federal stock number shall be omitted. 3.9 Worhanship - The valves shall be uniform in quality and shall be free from irregularities, defects, or foreign matter which could adversely affect safety, performance, reliability or durability. 4. QUALITY ASSURANCE PROVISIONS 4.1 Respon
40、sibility for inspection - Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified, the supplier may utilize his own facilities or any other commercial laboratory ac
41、cept- able to the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed neces- sary to assure supplies and services conform to prescribed requirements. 4.2 Classification of inspection - The examination and te
42、sting of the valves shall be classified as follows: - 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-V-5027D L(8 W 777770b 0270588 O = MIL-V-5027D (a) Qualification inspection - Qualification inspection consists of examinations and tests perf
43、ormed on samples submitted for approval as qualified products. (b) First article inspection - First article inspection consists of examinations and tests performed on samples which are representative of the production item after award of a contract to determine that the production item meets the req
44、uirements of this spec- ification. (c) QuaHty conformance inspection - Quality conformance inspection consists of examinations and tests performed on individual products or lots to determine conformance of the products or lots with the requirements set forth in this specification, 4.3 Qualification
45、inspection - Qualification inspection shall consist of all the examinations and tests of this specification, . 4.3.1 Qualification samples - Qualification samples shall consist of four valves of each style and 6 elastomer test slabs, 6 inches by 6 inches by 0.075 inch, composed of the identical ozon
46、e-resistant composition tuid cure that was used in manufacturing the elastomer components. The qialification samples shall be forwarded to the Supply Officer, Naval Air Development Center, Johnsville, Warminis- ter, Pennsylvania 18974, Attention: _ Director, Aerospace Crew Equipment Department. The
47、samples shall be plainly identified by securely attached durable tags marked with the following information: Samples submitted by (name) (date) for qualification inspection in accordance with requirements of MIL- V-502 7D and number under authorization (reference authorizing letter and number) (see
48、6.4). 4 04 First article inspection - First article inspection shall consist of the following examinations and tests: Visual examination Cracking pressure (type rr) Reset pressure (type JI) Flow check leakage Body leakage Pressure drop 8 Provided by IHSNot for ResaleNo reproduction or networking per
49、mitted without license from IHS-,-,-4.4.1 MIL-V- 502 7D First article samples - 4.4.1.1 Applicable to the Naval Air Systems Command - Unless otherwise specified, as soon as practicable after the award of the contract or order, the manufacturer shall submit 4 valves. The samples shall be representative of the constrnction, workmanship, components, and materials to be used during production. When a contractor is
