1、1 Beneficial comments (recommendations, additions, deletions) and any pertinent data that may be of use in improving this document should be addressed to: Resources however, other cleaning and verification methods that do not contain class I and II ODC solvents should be used for production. 4. VERI
2、FICATION 4.1 as follows: Classification of inspections. The inspection requirements specified herein are classified a. First article inspection (see 4.2). b. Conformance inspection (see 4.3). 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-
3、38203D 9999906 2077340 53T W MIL-PRF-3 820 1 D 4.2 First article inspection. When specified by the procuring activity (see 6.2), one valve assembly shall be subjected to all the inspections and tests in 4.6 and 4.7. 4.2.1 Reliabilitv test. One preproduction sample, aRer passing all other inspections
4、, shall be tested for reliability as specified in 4.9. 4.3 4.3.1 Conformance insrection. Conformance inspection shall include tests in 4.3.1 and 4.3.2. Individual tests. Each valve shall be subjected to the following tests and examination: a. Examination of product (see 4.6) b. Leakage (CRU-59E) (se
5、e 4.7.1) c. 4.3.2 Samling inspection. Samples of liquid oxygen valves shall be selected from a lot of completed inflation devices in accordance with inspection Level II of ANSUASQC Z1.4, or equivalent, and subjected to the following tests: Leakage (complete connection) (see 4.7.3) a. Leakage (primar
6、y connection) (see 4.7.2) b. Flow rate (see 4.7.4) c. Simulated aircraft-mounted converter filling (see 4.7.5) d. Connection, disconnection torque (see 4.7.6) e. Reliability (see 4.9) 4.4 section 3 requirements tested or verified in the paragraphs below. ReaUirements cross-reference matrix. Table I
7、provides a cross-reference matrix of the 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_ MIL-PRF-38201D 9999906 2077141 476 3.2 3.3 3.3.1 MIL-PRF-3 820 1D TABLE I. Requirements cross-reference matrix. 4.6 3.7.1 4.7.1 4.6 3.7.2 4.7.2 4.6 3.7.3 4.7
8、.3 REQUIREMENT I VERIFICATION I REQUREMENT I VERIFICATION I 3.4 3.4.1 3.4.2 4.6 3.7.4 4.7.4 4.7.3 3.7.5 4.7.5 4.7.5 3.7.6 4.7.6 3.4.3 3.4.3.1 3.5 3.6 3.6.1 4.6 3.8a 4.8.1, 4.8.2 4.6 3.8b 4.8.3 4.7.5 3.8 4.8.4 4.6 3.10 4.6 4.6 3.9 4.9 3.6.2 I 4.6 1 3.1 1 I 4.6 I 4.5 ambient conditions, i.e., atmosphe
9、ric pressure of 28 to 32 inches of mercury, temperature of 59 to 95 OF, and relative humidity of not more than 80%. If conditions change during a test, the test shall be suspended and appropriate corrections applied before resuming the test. Unless otherwise indicated in the test procedures, test sa
10、mple temperature conditioning shall be at least one hour longer than that required for the sample to reach thermal equilibrium. Test conditions. Unless otherwise specified, ail inspections shail be performed under 4.5.1 Test medium. Unless otherwise specified, the test medium shall be oxygen conform
11、ing to MIL-PRF-27210, liquid and gas, or nitrogen conforming to BB-N-411, liquid and gas, Class 1, Grade B. The units shall be purged prior to each phase of the test program using gaseous nitrogen conforming to BB-N-411, (Type 1) Class 1, Grade B. 4.6 Examination of uroduct. Each valve shall be care
12、fully examined to determine conformance with respect to materials, interface, design, identification, and interchangeability. 4.7 Tests. 4.7.1 disconnected, a gaseous pressure of 50 psig shall be applied to the inlet connection for at least 1 minute. The gas leakage from the valve shall not exceed 0
13、.05 lpm. The poppet (see 6.5) shall be unseated 3 times prior to this test. Leakage (CRU-59E valve only). With the valve, tested as specified in 4.7.3.” 4.7.2 Leakage (primary connection). With the valve mechanically connected to a valve conforming to MIL-PRF-25961 and with the mechanism that unseat
14、s the poppets in the seated position, a gaseous pressure of 50 psig shall be applied to the inlet connection of the CRU-59E valve for at least 1 minute. With the pressure applied, the combined leakage from the CRU-59E valve and the outlet of the valve conforming to MIL-PRF-25961 shall not exceed 0.0
15、5 lpm. The poppet seal shall be unseated 3 times prior to this test. 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-38203D 0b 2077342 302 H * MIL-PRF-3 820 1 D 4.7.3 Leakage (complete connection). The CRU-59E valve shall be attached to a l
16、iquid oxygen supply source at 30 psig. A CRU-SO/A valve (MIL-PRF-25961) shall be fitted to a 300 psig working pressure LOX converter in a simulated aircraft manner. The converter shall be partially filled and shall be at operating pressure. With the valve completely connected (poppets unseated) to t
17、he CRU-SOIA valve. A flow of test liquid under a pressure of 30 psig measured at the valve inlet shall be passed through the two valves for at least 1 O minutes. During this test, the valves shall be disconnected and reconnected at least three times. Under all conditions of test liquid flow and disc
18、onnections, there shall be no visual evidence of leakage of test liquid from either the poppet or interior areas, as evidenced by any liquid flow. The CRU-59E valve shall then be subjected to the tests of paragraph 4.7.1. 4.7.4 Flow rate. The valve shall be completely connected (poppets unseated) to
19、 a CRU-59/A valve and a flowmeter shall be connected to the outlet of the valve by means of a 3/8 inch tube. A maximum pressure of 3 psig shall be applied to the inlet of the CRU-59E valve and flow from the CRU-59/A valve shall be greater than 40 lpm. 4.7.5 conforming to MIL-PRF-25961 that is mounte
20、d in a horizontal position as shown in figure 3. A flow of test liquid under a minimum pressure of 30 psig at the valve inlet shall be passed through both valves. There shall be no evidence of test liquid leakage from the valve or from the mating surfaces. This test shall be repeated with the MIL-PR
21、F-25961 valve mounted in a vertical position with the inlet of the CRU-59E valve down. During both of these tests the valves shall be disconnected and visually inspected for entrapment of liquid between mating surfaces and leakage. Simulated aircraft-mounted converter fillinq. The valve shall be con
22、nected to a valve 4.7.6 Connection. disconnection torque. The CRU-59E valve shall be completely connected (poppets unseated) to a CRU-59A valve and then completely disconnected. The torque required to make this connection and disconnection shall not exceed 85 inch-pounds nor be less than 20 inch-pun
23、ds. 4.8 Environmental tests. 4.8.1 Hi Eh temoerature eqosu re. The valve shall be exposed to a temperature of 160 k 5 OF for a minimum of four hours. While exposed to this temperature, the valve assembly shall be subjected to and pass the examination and tests of paragraphs 4.7.1,4.7.2, and 4.7.3. T
24、he valve assembly shall be removed fkom the chamber and immediately subjected to the test in paragraph 4.7.5. 4.8.2 Low temperature exposure. The valve shall be exposed to a temperature of -65 f 5 OF for a minimum of four hours. While exposed to this temperature, the valve assembly shall be subjecte
25、d to and pass the examination and tests of paragraphs 4.7.1,4.7.2, and 4.7.3. The vdve assembly shall be removed fiom the chamber and immediately subjected to the test in paragraph 4.7.5. . 4.8.3 Vibration. The valve assembly with cap shall be tested in accordance with MIL-STD-810, Method 514, test
26、procedure I, category 10. At the conclusion of these tests, the tests in paragraphs 4.7.1 , 4.7.2,4.7.3,4.7.4,4.7.5, and 4.7.6 shall be performed. 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-3820LD m 9999906 20773q3 2q9 m MIL-PRF38201D
27、 4.8.4 Shock. The valve assembly with cap shall be tested in accordance with MIL-STD-810, Method 5 16, procedure I. At the conclusion of these tests, the tests in paragraphs 4.7.1,4.7.2, 4.7.3,4.7.4, 4.7.5 and 4.7.6 shall be performed. 4.9 Reliability. The valve shall be subjected to cycles of conne
28、ction and disconnection to a mating valve conforming to MIL-PRF-25961, using the test setup similar to the one shown in figure 3. A cycle shall consist of complete connection (poppet unseated) including: venting of the CRU-SO/A valve from 300 psig, flow of test liquid through the mated valves, and d
29、isconnection (valves separated). The assembly shall be subjected to the tests specified in paragraphs 4.7.1, 4.7.3, 4.7.5, and 4.7.6 every 700 cycles during the reliability test, to determine if a failure has occurred. A valve assembly failing any of these tests shall have failed the reliability tes
30、t. In addition, any failure of the valve to mate properly or any fracture of components shall constitute a test failure. No parts shall be replaced during the reliability testing as preventive maintenance. Acceptance shall be based on the accept-reject criteria of test plan I of MIL-HDBK-78 1, as we
31、ll as recording, data handling, and reporting procedures. 4.10 Pressure Actuation. A CRU-5O/A valve shall have the buildup and gas ports connected to a 450 psig gaseous pressure source. The vent and fill outlet ports shall be open. Vpon connection with the CRU-59E valve, the CRU-5O/A shall vent the
32、450 psig pressure. 11 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-38201D M 999990b 2077144 185 MIL-PRF-3 820 1 D 4 6FT VALVE INLET PRESSURE GAUGE WITH PIGTAIL VISE, LIQUID OXYGEN TANK OR PRESSURE SOURCE 3 FT / CRU-591E 1 TESTVALVE I/ / VA
33、LVE END /i / I i . - / / CONFORMING / TO FILL PORT OF . /, CRUSWA VALVE , -y .-d/ i 10 FT HOSE WEIGHING 20 POUNDS FLOOR pKEGKl FOR REFERENCE ONLY FIGURE 3. Simulated aircraft-mounted converter filling. 12 m c 3Fr - Provided by IHSNot for ResaleNo reproduction or networking permitted without license
34、from IHS-,-,-MIL-PRF-3820LD 0b 2077345 OLL MIL-PRF-3 820 1 D 5. PACKAGING 5.1 the contract or order (see 6.2). When actual packaging of materiel is to be performed by DoD personnel, these personnel need to contact the responsible packaging activity to ascertain requisite packaging requirements. Pack
35、aging requirements are maintained by the Inventory Control Point packaging activity within the Military Department or Defense Agency, or within the Military Departments System Command. Packaging data retrieval is available from the managing Military Department or Defense Agency automated packaging f
36、iles, CD-ROM products, or by contacting the responsible packaging activity. Packaging. For acquisition purposes, the packaging requirements shall be as specified in 6. NOTES (This section contains information of a general or explanatory nature which may be helpful, but is not mandatory.) 6.1 tank to
37、 fill aircraft-mounted converters with liquid oxygen. Intended use. The valve is intended to be used with a storage and servicing liquid oxygen 6.2 Acauisition requirements. Acquisition documents must specify the following: a. Title, number, and date of this specification. b. Issue of the DoDISS to
38、be cited in the solicitation, and if required, the specific issue of individual documents referenced (see 2.2). c. When first article inspection is required (see 3.1). d. The requirement for the vendor to identify proposed coatings if aluminum or aluminum alloys are used and anodization is not to be
39、 used (see 3.3.1). e. Item identification (see 3.1 O), f. Packaging requirements (see 5.1). g. Data required. 6.3 procurements as a guide for anodizing aluminum and aluminum alloys, if used. Anodizing. MIL-A-8625, Type I or II has been used successfully in previous 6.4 Valve poppet. The term “poppet
40、” in this specification is defined as the valve opening and closing (or sealing) mechanism, and is not to be construed to mean only the spring-loaded poppet type of valve. Tests requiring unseating or seating of the poppet should also be interpreted to mean opening or closing of the sealing mechanis
41、m, if the valve is not of the traditional spring- loaded poppet type of valve. 6.5 Environmental testing. Test methods are specified in MIL-STD-8 1 OE. 13 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-38201D 999990b 2077146 T58 W MIL-PRF-38
42、201D 6.6 changes with respect to the previous issue due to the extent of the changes. Chanaes - fiom urevious issue. Marginal notations are not used in this revision to identfi 6.7. Subiect term (key word) listing. Valve assembly Valve cap Liquid oxygen Charging cart LOX Custodians: Air Force - 99 Army - GL Review activities: Air Force - 11 Preparing Activity: Air Force - 82 (Project No. 3655-9998) 14 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
