1、MIL-V-8057F MIL-V-6057F 25 air conforming to BB-A-1034 Grade A or C; or nitrogen conforming to BB-N-411, Class 1, Grade A. h.6.3. position. Only the internal force shall be used to position the valve at either 4.7. Test methods. 4.7.1. Examination of product. Unless otherwise specified by the procur
2、ing activity. each valve shall be inspected to determine conformance to this speci- ficatiohwith respect to material, workmanship, and markings. “4.7.2. Vent-port leakage. The gas port of the valve shall be suitably plugged and the valve set in the buildup position. and 300 psig and 10 inches of wat
3、er shall be applied to the buildup port. Under these conditions, the combined leakage around the valve stem and through the vent port shall not exceed 0.05 liter per minute. Gaseous pressures of 70 4.7.3. The vent port of the valve shall be suitably plugged and the valve set in the vent position. A
4、gaseous pressure of approximately 30 psig shall be applied to the buildup port. Under these conditions, combined leakage through the gas port and around the valve stem shall not exceed 0.25 liter per minute. liter per minute when 10 inches of water pressure is applied to the buildup port. Gas-port l
5、eakage. Under similar conditions, leakage shall not exceed 0.05 4.7.4. High-temperature operation. temperature of at least 260F for not less than 1 hour. While maintained at The sample valves shall be heated to a this temperature, they shall be subjected to the Vent-port leakage and Gas- port leakag
6、e tests as specified in 4.7.2 and 4.7.3 respectively. er or other suitable means. The flow rate shall be at least 4.3 ambient cfm. The valves shall then be set in the buildup position and a pressure of 21 inches of water applied to the buildup port. bient cfm. the valves to the given amount. ured in
7、 inches of water shall be less than the amounts specified. Gas flow The flow rate through the valve shall be at least 1.4 am- The tests may also be checked by adjusting the flow rates through In this case, the differential pressure meas- 4.7.9. plished on the valve while it is in each of three mutua
8、lly perpendicular posi- tions. Orientation. The flow rates shall be within the limits spcifi.ed, in each of the The flow rates test as specified in 4.7.8 shall be accom- . positions. 94.7.10. Extreme low temperature operation. The valve shall be connected to a 300 psi working pressure IL)X converter
9、 in an assimulated aircraft manner. With, the valve in the vent position the converter shall be filled with liquid oxygen at 20 to 40 psi and allowed to run over for one minute. There shall be no evi- dence of leakage around the valve stem during this test. The source will be , disconnected from the
10、 converter and the valve immediately placed in,the build- up position. This operation shall completely cut off the flow of liquid oxygen and there shall be no evidence of leakage of liquid. Leakage through the valve shall be measured at the vent port as the converter pressure builds up through- out
11、the entire range from O to 300 psi. After one minute gaseous leakage shall not exceed 0.05 liters per minute. subjected to the vent-port and gas-port leakage tests as specified in 4.7.2 and h.7.3 respectively. Following this test, each valve shall be +& .8. Reliability qualification demonstration. F
12、our samples shall be tested for reliability. The reliability of the equipment shall be expressed in terms of 90 percent confidence that the MCBF shall be equal to or greater than 1000 cycles. The equipnent shall be operated under cryogenic conditions simulating actual usage. while in the vent positi
13、on at 20 to LO psi, placing the valve in buildup and applying 300 psi to the gas and buildup ports, then releasing the pressure by returning the valve to the vent position. shall be subjected to the extreme low temperature operation test per paragraph &.7.lO above including the vent-port and gas-por
14、t leakage tests. A cycle shall consist of flowing liquid oggen through the valve After each 250 cycles each valve Each of the 11 i ., -. . -. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-805 7F four samples will be cycled until failure. cien
15、cy or condition such that the valve cannot meet all of the performance requirements contained herein. meeting the accept/reject criteria of 4.8.1. A failure consists of any defi- Reliability qualification will consist of +&.8.1. Reliability accept reject criteria. The following accept/reject criteri
16、a will be used to determine reliability qualification. data (time to failure of each of the four samples) the sample MCBF (x will be determined by : From the test i=l where 3 = cycles to failure of the ith valve The sample standard deviation (S) is determined using: n = sample size (b) I if 1000 + 0
17、.819s - accept, otherwise reject. completed on each of the four valves, stop test and accept. 4.9. Preservation and packaging. Unless otherwise specified in the purchase order or contract, the supplier is responsible for the performance of all inspections required as listed in Table III, of MIL-P-11
18、6 for the method of preservation being accomplished. If no failure occurs before 1100 cycles are *s. PREPARATION FR DELIVERY 5.1. Unless other wise specified by the procuring activity, the valves shall be prepared for delivery in accordance with MIL-SID- Preservation and packaging. 794. 12 Provided
19、by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-U-8057F = 7999906 2034887 776 MIL-V-8057F 45.1 .I. Levels A, B and C. Fach valve shall be preserved and packaged in accordance with Method IA-8 of MIL-P-116 without contact preservatives immediately af ter c
20、leaning (3.1 O) . 5.2. Packing. The required level of packing A, B or C shall be specified by the procuring activity (see paragraph 6.2). 5.2.1. Level A. Each valve preserved as specified in paragraph 5.1.1 shall be packedexterior type weather resistant containers. shall be closed, sealed and reinfo
21、rced in accordance with the appendix thereto. Al1 containers 5.2.2. Level B. All valves preserved as specified in paragraph 5.1.1 shall be packeddomestic type exterior containers. closed and strapped in accordance with the appendix thereto. All containers shall be 5.2.3. ance by the carrier shall be
22、 packed in exterior type shipping containers in such a manner as to insure safe transportation at the lowest rate to the point of delivery, or regulations of other common carriers as applicable to the mode of transpor- tation. Level C. All packaged valves which require over-packing for accept- Conta
23、iners shall meet the uniform freight classification rules 5.3. Marking. ance with MIL-STD-129. The exterior and interior containers shall be marked in accord- 5.3.1 . Precautionary marking. The following precautionary marking shall ap- pear on each unit package: CAUT ION : D3 NOT ALUW CONTAMINANTS O
24、F ANY KIND TO BE USED ON OR ABOUT VALVES 6. NOTES 6.1. The valve covered by this specification is intended to be used to control the flow of gaseous oxygen in the pressure buildup and vent circuits of liquid oxygen converter systems up to 300 psig operating pressure. Intended use. “6.2. Ordering dat
25、a. Procurement documents shall specify the following: a. b. Title, number, and date of this specification. Selection of applicable levels of preservation, packaging, and packing. c. Unit quantities. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL
26、-V-8057F = 9999906 2034888 602 = MIL-V-8 O57F d. If first article inspection is required for production contracts DD Form lL23 will be made part of the contract to require that reproducible copie of the test report be furnished to the procuring activity. e. contracts. Whether or not first article in
27、spection is required for production 6.3. Qualification. With respect to products requiring qualification, awards will be made only for products which are at the time set for opening of bids, qualified for inclusion in the applicable Qualified Products List whether or not such products have actually
28、been so listed by that date. of the suppliers is called to this requirement,and manufacturers are urged to arrange to have the products that they propose to offer to the Federal Govern- ment tested for qualification in order that they may be eligible to be awarded contracts or orders for the product
29、s covered by this specification. The activ- ity responsible for the Qualified Products List is OCAMA (MMEO), Tinker Air Force Base Oklahoma City, Oklahoma 73145 and information pertaining to quali- fication of the products may be obtained from that activity. The attention 6.3.1. Qualification test d
30、ata. When requested, the manufacturer shall sub- mit engineering drawings and inspection reports in accordance with Defense Standardization Document a-6 Provisions Governing Qualification. NOTE: The margins of this specification are marked with an asterisk to indi- cate where changes (additions, mod
31、ifications, corrections, deletions) from the previous issue were made. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the require- ments of this document based on the en
32、tire content irrespective of the mar- ginal notations and relationship to the last previous issue. Custodians Navy - AS Air Force - 71 Preparing Activity: Air Force - 71 Project Number: 1660-0295 14 .ft U. GOVERNMENT PRINTING WFICE: l973 -71&546/56 19 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
