1、 - MIL-PRF-25370F 9999906 203b570 300 MIL-PRF-253 70F 09 May 1997 SUPERSEDING 12 July 1994 MIL-L-25 3 70E(uSAF) PERFORMANCE SPECIFICATION VALVE, PNEUMATIC INFLATOR (LIFE PRESERVER, MA-1) This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1-1
2、 MA-1). Scope. This specification covers one type of pneumatic inflator valve (life preserver, 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are cited in sections 3 and 4 of this specification. These lists do not include documents cited in other sections of this specifica
3、tion or recommended for additional information or as examples. While every effort has been made to ensure the completeness of these lists, document users are cautioned that they must meet all specified requirements documents cited in sections 3 and 4 of this specification, whether or not they are li
4、sted. 2.2 Government documents. 2.2.1 Specifications and standards. The following specifications and standards form a part of this document to the extent specified herein. Unless otherwise specified, the applicable issues o Beneficial comments (recommendations, additions, deletions) and any pertinen
5、t data that may be of use in improving this document should be addressed to: Resources & Logistics Services Division, SA-ALC/TILDD, 485 Quentin Roosevelt Road, Kelly AFB TX 78241-6425, by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or
6、by letter. AMSC N/A FSC 4220 DISTRIBUTION STATEMENT A. Approved for public release: distribution is unlimited. Licensed by Information Handling ServicesMIL-PRF-253 70F these documents are those listed in the specific issue of the Department of Defense hdex of Specifications and Standards (DoDISS) an
7、d supplement thereto, cited in the solicitation (see 6.2). SPECIFICATIONS DEPARTMENT OF DEFENSE MIL-PRF-25369 - Cylinders, Carbon Dioxide, For the Inflation of Pneumatic Life Preservers (Unless otherwise indicated, copies of the above specification are available from the Defense Automated Printed Se
8、rvice, Bldg 4D (DPM-DODSSP), 700 Robbins Avenue, Philadelphia PA 191 11-5094) 2.3 Non-Government publications. The following document(s) form a part of this document to the extent specified herein. Unless otherwise specified, the applicable issues of the documents which have been adopted by the DoD
9、are those listed in the specific issue of the DoDISS cited in the solicitation. Unless otherwise specified, the documents not listed in the DoDISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN SOCIETY FOR QUALITY CONTROL ANSUASQC Z 1.4- 1993 - Sampling Procedures and
10、Tables for Inspection by Attributes (Application for copies should be addressed to the American Society for Quality Control, 6 1 1 East Wisconsin Avenue, P.O. Box 3005, Milwaukee, Wisconsin 53201 -3005) AMERICAN SOCIETY FOR TESTING AND MATERTALS (ASTM) - ASTM-B-117 - Standard Test Method of Salt Spr
11、ay (FOG) Testing (Application for copies should be addressed to the American Society For Testing and Materials, 1916 Race Street, Philadelphia, Pennsylvania 19103-1 187) 2.4 references cited herein (except for related associated specifications or specification sheets), the text of this document take
12、s precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. If there is a conflict between the contents of this specification and an associated specification or specification sheet, the associated specification or specifi
13、cation sheet should apply. Order of precedence . In the event of a conflict between the text of this document and the 3. REQUIREMENTS 3.1 General. Figure 1 represents a general concept of a pneumatic inflator valve. It should be used for general dimensional purposes such as length, width and thickne
14、ss but should not be 2 Licensed by Information Handling ServicesMIL-PRF-25370F 9799906 203b572 183 MIL-PRF-25 370F construed as the only possible design approach. 3.2 article inspection in accordance with 4.5. First article. When a first article is specified (see 6.2 and 6.4) it shall be subjected t
15、o first 3.3 component parts used in the inflator valve shall have been manufactured not more than 12 months prior to the date of delivery to the Government. &. Unless otherwise specifically approved by the procuring activity, all materials and 3.4 decomposition, fungus, salt spray, and any other atm
16、ospheric condition that may be encountered during operational use or storage. Materials. All materials shall be suitably treated to resist corrosion due to electrolytic 3.5 Rl. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provided that th
17、e materials meet or exceed the operational or maintenance requirements, and promote economically advantageous life cycle costs. 3.6 world-wide environmental conditions expected to be encountered by aircrew personnel. The unit shall function easily by personnel wearing standard flight gear. peration.
18、 The pneumatic infiator valve shall be capable of being easily operated in 3.6.1 with the infiator valve housing in the unopened position. The actuator shall be secured in the unopened position. The inflator valve shall consist of a piercing mechanism that will retract immediately fi-om the opening
19、of the punctured cylinder, and have a seal that shall prevent leakage of the life preserver cell with the actuator in any position. The inlet of the inflator valve shall be threaded to accept a carbon dioxide cylinder conforming to MIL-PRF-25369. A locking mechanism shall be provided to retain the c
20、arbon dioxide cylinder in the inlet. An outlet shall be provided to mount the inflator valve on the life preserver cell valve stem as shown in Figure 2. A passage shall be provided for conducting gas fi-om the punctured carbon dioxide cylinder to the outlet when actuated. The outlet shall align with
21、 the hole in the side of the stem regardless of which side of the outlet is toward the base of the stem. Inflator valve housing. The inflator valve shall consist of an actuator that shall be flush 3.6.2 Valve stem cap. A valve stem cap (see figure 2) shall be provided to hold the inflator valve in p
22、lace on the valve stem. 3.7 Performance. 3.7.1 operate the piercing mechanism. linder. An actuating load of not more than 20 pounds shall 3.7.2 dioxide cylinder conforming to MIL-PRF-25369 for the life of the infiator valve. The Piercing mechanism. The piercing mechanism shall be capable of puncturi
23、ng a carbon 3 Licensed by Information Handling Services MIL-PRF-25370F 9999906 2036573 OLT MIL-PRF-25370F mechanism shall be positioned so as not to accidentally puncture the cylinder due to vibrations or other motion encountered in an operational or storage environment. 3.7.3 pressure of 1500 psi w
24、ithout deformation or leakage. Hydrostatic pressure. The inflator valve shall satisfactorily withstand a hydrostatic 3.7.4 Salt spray. The inflator valve shall operate properly after exposure to a salt spray environment. 3.7.5 Leakage. The inflator valve shall display no evidence of leakage during n
25、ormal operation. 3.7.6 peration test with cylinder. With an actuating load of not more than 20 pounds, the inflator valve shall pierce and discharge a cylinder conforming to MIL-PRF-25369 in not more than 2.5 seconds. 3.7.7 Lock. The lock shall be such that a cylinder installed with a torque of 60 i
26、nch-pounds can be loosened with a torque of not less than 30 or more than 60 inch-pounds. 3.7.8 Weight. The total weight of the pneumatic inflator valve shall not exceed 60 grams. 3.7.9 Supportability. All parts having the same manufacturers part number shall be functionally and dimensionally interc
27、hangeable. The item identification and part number requirements of 3.7.10 shall govern the manufacturers part number and changes thereto. 3.7.1 O Identification. The pneumatic inflator valve shall be marked for identification with the following information: VALVE, PNEUMATIC INFLATOR (LIFE PRESERVER.
28、, MA-1) Manufacturers Identification Contract or Order No. Date of Manufacture The identification marking on the assemblies shall be durable enough to last through the normal life expectancy of the item and be capable of withstanding the environmental tests and cleaning procedures specified. All mar
29、kings shall be clearly readable. Identification marking on identification plates shall be of a color which is in contrast to the color of the surface of the plate. Identification tag marking, when used, shall be permanent to the extent required for the utilization of the item. Whenever practical, th
30、e marking of the item shall be located in such a manner as to allow it being visible during normal operational use. The use of marking materials that create environmentally hazardous conditions is prohibited. The marking of items shall be accomplished in a manner which shall not adversely affect the
31、 life and utility of the item (see 6.5). 4 Licensed by Information Handling Services MIL-PRF-25370F D 9999906 2036574 T5b MIL-PRF-25370F 3.7.1 1 Safety. The pneumatic infiator valve shall be functional without sharp edges, burrs, or protrusions that might cause injury or prevent the use of the item.
32、 3.7.12 Workmanship. The inflator valve, including all parts and equipment, shall be constructed in accordance with commonly accepted industrial workmanship standards. 3.7.13 Actuator safety restraint. An actuator safety restraint shall be provided to prevent the actuator from operating accidentally
33、 and causing the piercing mechanism to puncture the carbon dioxide cylinder. Some examples of restraints are a thread-like material, a shearing pin, or a clip. The restraint shall be replaceable. 4. VERIFICATION 4.1 as follows: Classification of insr, - ection. The inspection requirements specified
34、herein are classified a. Individual inspection (see 4.2) b. Sampling inspection (see 4.3) 4.2 described under 4.7. Individual inspection. Individual inspections shall consist of the following tests as a. Examination of product (see 4.7.1) b. Operation test without cylinder (see 4.7.2) c. Piercing me
35、chanism operation (see 4.7.3) d. Actuator operation (see 4.7.4) 4.3 Sampling inspection. 4.3.1 Lot size. A lot shall consist of inflator valves manufactured under essentially the same conditions and submitted for inspection at the same time. The lot size for sampling plans A and B shall consist of u
36、p to 500 units. The lot size for sampling plan C shall be in accordance with ANSUASQC 21.4-1993 inspection level S-3. Sampling plans A, B, and C shall be conducted in accordance with the quality assurance section of the contract. Non-conformance requirements for sampling plans A, B, and C shall be p
37、rovided in the quality assurance section of the contract (see 6.7). 4.3.1.1 Samu ling plan A. One infiator valve shall be selected at random fiom the first lot, and from each fourth lot thereafter, and shall be subjected to the following tests as described under 4.7. 5 Licensed by Information Handli
38、ng Services MIL-PRF-25370F 9Oh 203b575 992 = MIL-PRF-253 70F a. Hydrostatic pressure (see 4.7.5) b. Salt spray (see 4.7.6) C. Safety actuator restraint (see 4.7.10) 4.3.1.2 Sarnding plan B. Ten inflator valves shall be selected at random from each lot and shall be subjected to the following tests as
39、 described under 4.7. a. Leakage (see 4.7.7) b. Operation test with cylinder (see 4.7.8) C. Lock (see 4.7.9) 4.3.1.3 Sampling plan C. Upon completion of the individual tests specified in 4.2, random samples shall be selected from each lot in accordance with inspection level S-3 of the ANSVASQC 21.4-
40、1993. The sample size shall be based only on the applicable size code letter corresponding to inspection level S-3. Each inflator valve selected as a sample unit shall be forwarded to an inspection activity (see 6.3) selected by the procuring activity for the following tests as described under 4.7.
41、a. Examination of product (see 4.7.1) b. Operation test without cylinder (see 4.7.2) c. Piercing mechanism operation (see 4.7.3) d. Actuator operation (see 4.7.4) 4.4 hspection conditions. 4.4.1 specification shall be made at an atmospheric pressure of 28 to 32 inches of mercury, a temperature of 70
42、 f 18 degrees Fahrenheit, and a relative humidity of 80 percent or less. If these conditions are not obtainable, proper corrections shall be made to the tests or the test results to compensate for the different atmospheric conditions. Atmosp heric conditions. Unless otherwise specified, all tests re
43、quired by this 4.5 First article inspection. If first articles are specified (see 6.2 and 6.4), the first article shall consist of two units. First article inspection may consist of one or more of the described sampling plans (see 4.3). 4.6 requirements in section 3. Verification methods indicated i
44、n this section are mandated after Verification alternatives. The pneumatic inflator valve shall meet all performance 6 Licensed by Information Handling Services- MIL-PRF-25370F 9999906 2036576 829 MIL-PRF-25 370F contract execution. Alternative test methods, techniques, or equipment, including the a
45、pplication of statistical process control or cost effective sampling procedures, can be proposed and used provided that these altematives offer equal assurance that all product requirements are met. Such acceptable alternative verification approaches shall be inserted into the contract as negotiated
46、 replacements. In case of dispute as to whether any alternatives provide necessary equal assurance, the verification provisions as delineated in this specification apply. 4.7 tested or verified in the paragraphs below. Methods of inspection. Table 1 provides a cross-reference matrix of the requireme
47、nts TABLE 1 : Requirements Cross-Reference Matrix REQUIREMENT 3.7.1 3.7.2 3.7.3 3.7.4 3.7.5 3.7.6 3.7.7 3.7.8 3.7.9 3.7.10 3.7.11 3.7.12 3.7.13 VERIFICATION 4.7.2 4.7.5 4.7.6 4.7.7 4.7.8 4.7.9 4.7.1 4.7.1 4.7.1 4.7.1 4.1.1 4.7.10 4.7.3,4.7.4 4.7.1 compliance with the requirements of this specificati
48、on with respect to workmanship, materials, markings, dimensions, weight, and construction as cited in section 3. Examination. Each inflator valve shall be visually examined to determine 4.7.2 with a 20-pound load attached to the actuator with the actuator held in the normal position. The load shall
49、be released and the actuator shall operate the piercing mechanism. The actuator safety restraint shall not be used to secure the actuator during this test. p eration test without cvlinder. The inflator valve shall be held in an inverted position 4.7.3 Piercing mechanism op eration. The piercing mechanism shall be operated through its full range of motion. The mechanism shall not be capable of piercing the cylinder while in the stored position when it is subjected to a vibration frequency specified in the procuring documents, 4.7.4 Actuator operation. If a lever style actua
