1、1. MIL-V-8612A 5 FEBRUARY 14 7 1 SUPERSEDING 13 July 1953 MIL-V-8612(ASG) MILITARY SPE CIF ICAT ION VALVE; HIGH-PRESSURE OXYGEN LINE This specification is mandatory for use by all Depart- ments and Agencies of the Department of Defense. SCOPE 1.1 This specification covers one type of high-pressure o
2、xygen line valve. 2. APPLICABLE DOCUMENTS 2.1 The following documents, of the issue in effect on date of invita- tion for bids or request for proposal, form a part of this specification to the extent specified herein. SPE CIF ICATIONS . Federal 0-T-236 Tetrachloroethylene (Perchloroethylene), Techni
3、cal Grade 0-T-634 Trichloroethylene, Technical . PPP-B-636 Box, Fiberboard / i PPP-T-45 Tape, Gummed, Paper, Reinforced and Plain for Sealing and Securing Military MIL-P-116 Preservation, Methods of MIL-P-7105 Pipe Threads, Taper, Aeronautical National Form, Symbol ANPT, General Requirements for Pro
4、vided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_. * MIL-V-8612A SPE CLFICATIONS Military (Continued) MIL.-S- 8 8 7 9 MIL-0-2721 O STANDARDS Military MIL STD-1 O 5 MIL-STD-129 MIL-STD-130 RI S2 O 9 13 MS33586 Screw Threads, Controlled R dius Root with I
5、n- creased Minor Diameter, General Specification for Oxygen, Aviators Breathing, Liquid and Gas Sampling Procedures and Tables for Inspection by Attributes Marking for Shipment and Storage Identification Marking of U. S. Military Property Plug - Square Head Pipe Thread Metals, Definition of Dissimil
6、ar Air Force-Navy Aeronautical AN 815 Union-Flared Tube AN 818. Nut, Coupling AN 6012 Valve - High Pressure Oxygen Line (Copies of spec.ifications, standards, drawings, and publications required by suppliers in connection with specific procurement functions should be obtained from the procuring acti
7、vity or as directed by the contracting officer. ) 2.2 and all precautions shall be taken to prevent sticking. The valve seat shall be an integral part of the body. 3.3.7 Valve seat insert - The valve sea insert material shall be resistant to ignition by sudden compression of high-pressure oxygen. 3.
8、3.8 Degreasing - All internal parts of the valve shall be degreased using a vapor degreaser in accordance with 0-T-236 or 0-T-634. Ultrasonics may be used in conjunction with vapor phase degreasing for the cleaning of components. After completion of the cleaning and when assembled, General Electric
9、Type H Leak Detector or equivalent Halide testing apparatus shall be used to determine the absence of the cleaning compound. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I - _ _ . - _ - MIL-V-bL2A Lb 7977706 0187352 5 m MIL-V-8 612A 3.4 Performanc
10、e - 3.4.1 Leakage - The valve when tested as specified in 4.6.2, shall not permit leakage in excess of 2 cc per minute. 3.4.2 Pressure drop - The pressure drop across the valve, when tested as specified in 4.6.3, shall not exceed 5 psig. 3.4.3 Proof pressure - The valve, when tested as specified in
11、4.6.4, shall operate satisfactorily and shall not show any evidence of mechanical or material failure. 3.4.4 High temperature operation - The valve, after being conditioned as specified in 4.6.5 shall operate satisfactorily. 3.4.5 Low temperature operation - The valve, after being conditioned as spe
12、cified in 4.6.6 shall operate satisfactorily. 3.4.6 Vibration - The valve, when tested as specified in 4.6.7, shall operate satisfactorily and shall not show any evidence of mechanical or material failure. 3.4.7 Endurance - The valve, when tested as specified in 4.6.8, shall operate Satisfactorily a
13、nd shall not show any evidence of mechanical or material failure. 3.4.8 Torque - 3.4.8.1 Opening - The torque required to fully open the valve, when tested as specified in 4.6.9.1, shall not exceed 60 inch-pounds. .- 3.4.8.2 Sealing - The valve, when tested as specified in 4.6.9.2, shall not permit
14、leakage in excess of 2 cc per minute. 3.4.9 Ozone-resistance - The test slabs, when tested as specified in 4.6.10 shall not show any evidence of checking, cracking, or damage. 3.4.10 Oxygen bomb - The test material and valve, when tested as speci- fied in 4.6.11 shall not ignite and there shall not
15、be any evidence of charring or deter io r at ion. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-L I- NIL-V-8632A Lb - 9799706 0387353 7 - MILV-86 12A I 3.4.11 Disassenibly and examination - The valve, when examined as specified in 4.6.12 shall no
16、t show evidence of excessive deterioration or wear due to testing which might affect the valve performance. 3.5 Interchangeabilitx - All parts having the same manufacturers part number shall be functionally and dimensionally interchangeable. 3.6 Weight - The total weight of the valve assembly shall
17、not exceed 16 ounces. 3.7 Marking - I 3.7.1 cation in accordance with MILSTD-130, except that the Federal Stock Number shall be omitted. Identification of product - The valves shall be marked for identifi- 3.7.2 Direction of flow - The valve shall be clearly and permanently marked with an arrow on t
18、he outside of the body to indicate the direction of flow in accordance with the gas channels. 3.8 Workmanship - 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. Q
19、UALITY ASSURANCE PROVISIONS 4.1 Responsibility 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 in the contract or order, the supplier may u
20、se his own or any other facilities suitable for by the Government. The Government reserves the right to perform any of the inspec- tions set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. the performance of t
21、he inspection requirements specified herein, unless disapproved I 4.2 Classification of inspection - The examination and testing of the valves shall be classified as follows: (a) First article inspection - First article inspection consists of examinations and tests performed on samples which are rep
22、resentative of the production item after award of a con- tract to determine that the production item conforms to the requirements of this specification (see 3.1 and 4.3 through 4.3.2). . 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-8612A I
23、 (b) Quality conformance inspection - Quality conformance inspec- tion 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. First article inspection - The first article insp
24、ection of the high 4.3 pressure oxygen line valve shall consist of examination and tests for ali of the requirements of this specification. 4.3.1 First article samples - Unless otherwise specified, as soon as practicable after the award of the contract or order, the manufacturer shall submit 4 valve
25、s, The samples shall be representative of the construction, workmanship, components, and materials to be used during production. When a contractor is in continuous production of these valves from contract to contract, submission of further first article inspection samples on the new contract may be
26、waived at the discretion of the procuring activity (see 6.2). Approval of the first article inspection samples or the waiving of the first article inspection does not preclude the requirements for performing the quality conformance inspection. The first article inspection samples shaU be furnished t
27、o the Governirient as directed by the contracting officer (see 6.2 (c). 4.3.2 Upon completion of the first article inspection, all the applicable - inspection reports and, when applicable, recommendations and comments pertinent for use in monitoring production will be forwarded to the cognizant Gove
28、rnment activity. One of the approved first article inspection sample valves will be returned to the manufacturer for use in monitoring production. The other three valves will be destroyed in the first article inspection and shall not be considered as part of the quantity to be delivered under the co
29、ntract. 4.4 Quality conformance inspection - The sampling and inspection levels shall conform to MILSTD- 105. Quality conformance inspection shall con- sist of the following examinations and tests: Visual Examination Dimensional Check Leakage Pressure Drop Proof Pressure Torque Endurance Preparation
30、 for Delivery 4.4.1 Sampling - 4.4.1.1 Inspection lot - .t I 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- Y*$= MIL-V-b12A 1b W 9997906 0187355 O m7 Visual Examination MILV-86 12A 3.3, 3.6 and 3.8 4.4.1.1.1 Valve - An inspection lot size shall b
31、e expressed in units of one valve macle under essentially the same conditions and from the same inaterials aiid components. The sample unit shall be dne valve. Dimensional Check 4.4.1.1.2 Preparation for delivery -An inspection lot size shall be expressed in units of one fully prepared shipping cont
32、ainer, containing valves, fully prepared for delivery from essentially the same materials and components. The sample unit shall be one shipping container, containing valves fully prepared for delivery with the exception that it need not be sealed. 3.3.1 4.4.1.2 acceptance criteria, tests, and examin
33、ations required for the valves shall be as specified in Table I, Samplinv for tests and examinations of valves - The sample size, Everyvalve Everyvalve TABLF, I Reject all defective valves. Reject all defective valves. SAMPIX SIZE, ACCEPTANCE CRITERIA, EXAMINATIONS, AND TESTS OF THE VALVE5 Pressure
34、Drop Proof Press ur e Torque 3.4.2 3.4.3 3.4.8 I 4.6.9 I Everyvalve Reject all defective valves. 3.4.1 4.6.1.1 and Table II 4.6. i. 1.1 Every valve for critical defect s. Inspect ion Level II for minor defect s. Inspection Level S-2 Reject ail units with any critical defects. An acceptable quality l
35、evel of 2.5 defects per hundred units for minor defects. An acceptable quality level of 1.0 defect per 100 units. 4.6.4 Everyvalve 1 Reject all defective valves. 1 I 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-P . I 5- Section 5 INSPECTION 4PH
36、SAMPLE METHOD SIZE 4.6.8 Inspection Level S-2 4.6.1.2 Inspection Level S-2 Endurancez/ ACCEPTANCE CRITERIA i/ An acceptable quality level of 2.5 defects per 100 units. An acceptable quality level of 2.5 defects per 100 units. - Preparation for Delivery MIL-V-b12A 16 W 7977706 0387356 2 W MIL-V-8612A
37、 TABLE I (Continued) PAAGR REQUIREMENT 3.4.7 - i/ The sampling plan acceptance numbers shall apply collectively to all the characteristics within a stated acceptable quality level. - 2/ This is a destructive test (see 6.2). 4.5 Inspection conditions - 4.5.1 Oxygen - Unless otherwise specified, the o
38、xygen used in testing the valves shall conform to MILO-27210, Type I. 4.5.2 Temperature and pressure - Unless otherwise specified, tests shall be conducted at local ambient temperature and barometric pressure. The temperature and barometric pressure shall be recorded at the time of inspection. This
39、information shall be available for computation of test data, where required, to normal temperature and pressure (NTP) conditions. NTP conditions are 70“ F and 29.92 inches of mercury. Test instruments shall be calibrated or adjusted according to their required usage in conducting individual tests. 4
40、.6 Inspection methods - 4.6.1 Visual examination - 4.6.1.1 - Valve - Every valve shall be examined visually (for critical defects) to determine conformance to this specification. The classification of defects, TableII, shall beused to classify the defects found. All defects shall be classified as “C
41、ritical“ or flMinorft in accordance with Table II. 4.6.1.1.1 Dimensions - The valve shall be checked dimensionally to deter- mine conformance to the dimensions specified in AN6012. 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MILV-8612A TABLE II
42、 CLASSIFICATION OF DEFECTS FOR VISUAL EXAMINATION OF THE VALVE CRITICAL 1. Material imperfections - foreign matter embedded. 2. Surface - unclean, rough, misaligned, or con- taining cracks, nicks, or other flaws. 3. Any component missing, malformed, frac- tured, or otherwise damaged. 4. Any componen
43、t loose or otherwise not securely retained. 5. Incorrect assembling or improper positioning of components. 6. Any functioning part that works with difficulty. 7. Faulty workmanship or other irregularities. NIINOR 201. Marking - missing, insufficient, incor- rect, illegible, or not permanent. 4.6.1.2
44、 Preparation for delivery - Each of the fully prepared shipping containers, containing valves, selected as a sample unit from the lot, shall be examined to determine that the packaging, packing, and marking conform to this specification. The list of defects, Table III, shall be used to classify the
45、defects found. TABLE III UST OF DEFECTS FOR PREPARATION FOR DELIVERY ITEM Exterior and interior markings Packaging and Packing materials DEFECTS Missing, incorrect, incomplete, illegible; of improper size, location, sequence; or method of application; markings not the same on the interior and exteri
46、or containers. Any nonconforming component; any component missing, damaged, or otherwise defective. . 10 1 -0 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-b22A Lb m 7779906 OL8735 b W MIL-V-86 12A Exterior and interior weight or content -. I
47、nadequate application of the components such as incomplete closure of the unit package, intermediate package, container flaps, loose strappings, etc., bulging or distortion of the containers. Number per container is more or less than required; gross or net weight exceeds the requirements. TABLE III
48、(Continued) I I DEFECTS I I ITEM 4.6.2 Leakage - A pressure of 15 psig shall be applied to the inlet end of the valve with the outlet end capped. The valve shall be turned to the full open position and allowed to remain undisturbed for a period of not less than two minutes before observing for leaka
49、ge. At the end of this period, the valve shall be turned to the half-open position and again examined for leakage. The valve shall then be closed and examined for leakage with the outlet uncapped. This procedure shall be repeated utilizing a pressure of 1,800 psig. During each of these operations, the valve shall pass the requirements specified in 3.4.1. 4.6.3 Pressure drop - A constant pressu
