1、MIL-S-21720C 23 W 777770b 0301806 7 11 July 1975 SUPERCEDING MIL-S-21920B(OS) 15 September 1969 MILITARY SPECIFICATION SWITCH, HYDROSTATIC, MARK 41 MODS O AND 1 This specification is approved for use by all Departments and Agencies of the Department of Defense. 1 SCOPE 1.1 This specification establi
2、shes the requimmnts for the procurement of the Switch, Hydrostatic, Mark 41 Mods O and 1, Naval Sea Systems Ccmmand LD 299449 and PL 3212233, respectively. 2 APPLICABLE DOCUMENTS 2.1 or request for proposal, form a part of this specification to the extent specified herein. STANDARDS -. The following
3、 documents, of the issue in effect on the date of invitation for bids MILITARY MIL-STD-105 MIL-STD-129 MIL-STD-331 MIL-STD-454 Sampling Procedures and Tables for Inspection by Ateibutes Marking for Shipment and Storage Fuze and Fuze Components, Ehvironmental and Performance Tests for Standard Genera
4、l Requirements for Electronic Equipment DRAWINGS NAVAL SEA SYSTEMS COW (Code ident 10001) LD 299449 PL 3212233 DL 2644484 Switch, Hydrostatic, Mark 41 Mod O Switch, Hydrostatic, Mark 41 Mod 1 Shipping (Packing) Condition Hydrostatic Switch All drawing numbers referenced herein are Listed on LD 29944
5、9 or PL 3212233 unless otherwise desiguated. PUBLICATIONS NAVAL SE% SYSTEMS COMMAND WR-43 Naval Weapons Requirements, Preparation of Quality Assurance Requirements 2.2 ihloss otherwise indicated, the issue in effect on the date of invitation for bids or request fcm prpposal shall apply. Mher publica
6、tions. The following document forms a p (b) sea side down; (c). switch axis horizontal. 3.5 Environmental requirements. 3.5.1 teristics of this specification after being vibrated in accordance with 4.8.1. 3.5.2 characteristics of this specification after being shocked in accordance with 4.8.2. All f
7、our switch circuits shall remain open at all pressures below All four switch circuits shall remain open at all pressures below Contact resistance. The contact resistanee of each switch circuit, with the switch Operating position. Unless otherwise specified, the switch shall operate in a (a) sea side
8、 Vibration. The switeh shall meet all performance requirements and product charac- Shock. The.hydrostatic switch shall meet all performance requirements and product 3.5.3 Temperature. 3.5.3.1 The hydrostatic switch shall operate in a manner to meet all performance requirements and product characteri
9、stics of this specification at any temperature be- tween -3OC and 34OC (26OF and 93OF). 3.5.3.2 hydrostatic switch shall withstand without damage one i?-day JAN TEMPERATURE AND HUMIDITY CYCLE defined in MIL-STD-331, Test Hethod 105, except that the relative humidity in the chamber need not exceed ro
10、om ambient or ambient as controlled. Operating temperature. Storage temperature. When packaged and packed in accordance with section 5, the 3.5.4 High pressure. 3.5.4.1 static pressure for three minutes and show no evidence of leakage. 3.5.4.2 static pressure of 4.14 ma (600 PSIG) for three minutes,
11、 the switch shall not become unsafe by closing of the switches. 3.6 Prior to final assembly, all parts, components, and the assembly shall be thoroughly cleaned of loose, spattered, or excess solder, metal chips, and other foreign matter. Ruggedness. The switch shall withstand without damage 4.14 Me
12、a (600 PSIG) hydro- Safety. When the switch, with the safety pin in place, is subjected to a hydro- Cleanup. 3.7 4 QUALITY ASSURANCE PROVISIONS 4.1 chase order, the supplier is responsible for the performance of all inspection requirements as specified herein. his own or any other facilities suitabl
13、e for the performance of the inspection requirements specified herein, unless disapproved by the Government. perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. Workmanship. Work
14、manship shall be in accordance with requirement 9 of NIL-STD-454. Responsibility for inspection. Unless otherwise specified in the contract or pur- Except as otherwise specified in the contract or order, the supplier may use The Government reserves the right to 4.2 sified as follows: Classification
15、of inspection. Inspection of the hydrostatic switch shal be clas- 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-a. b. c. 4.3 Test equipment. tests required in this specification: First Article inspection (see 4.4) Quality conformance inspection (
16、see 4.5) Periodic production sample inspection (see 4.6) The following items of test equipment are required to perform the a. Test Set Mark 250 type with Accessory Set Mark 5 Hod O and Accessory Set Mark 13 Mod O (Government furnished) (see 6.2d). b. accuracy of k 2 percent. c. A torque wrench capab
17、le of applying ,565 N-m (5 pound-inches) of torque with an A test chamber capable of withstanding an internal pressure of 4.14 WPa (600 PSIG) hydrostatic pressure and capable of accepting a switch. d. A pull tester capable of measuring a pull of 8.9-N to 22.2-N (2 to 5 pounds). e. A resistance bridg
18、e capable of measuring a resistance of 1 ohm in increments of 0.1 ohm, accuracy 1 percent. 4.4 First article inspection. 4.4.1 designated in Table I. activity, through testing and subsequent analysis of the test results, is assured of contractor conformance to the contract technical requirements. op
19、tion of the Government based on analysis of detected defects. disapproved when either nonconforming characteristicsor unauthorized materials are found. (See 6.2b.) 4.5 Quality conformance inspection. 4.5.1 and tests designated in Table I. garding the unit as defective. 4.5.2 Sampling. switches selec
20、ted from each production lot (see 6.3.2) in accordance with MIL-STD-105, Inspection Level II, AQL of 1.0 percent defective. shall consist of one months production. Section 5. defective unit and shall result in rejection of the lot it represents if the number of defective units equals or exceeds the
21、rejection number for the stated AQL. First article sample. First articles shall be subjected to the examinations and tests First article smple approval will be granted when the Government testing Conditional acceptance may be granted at the A first article sample may be 100% inspection. During assem
22、bly, each unit shall be subjected to the examinations Any unit containing one or more defects shall be cause for re- Tests designated as sampling shall be conducted on a random sample of Unless otherwise specified (see 6.2f), a production lot Lot composition shall be in accordance with MIL-STD-105,
23、Failure of any unit to pass any quality conformance sampling test shall reject the 4.6 Periodic production inspection. (see 6.2g). 4.6.1 Periodic production samples. Periodic production tests specified in Table I shall be conducted on a random sample of hydrostatic switches selected from each lot (s
24、ee 6.2f) of hydro- static switches offered for acceptance. purchase order (see 6.2i). When a unit fails to pass any periodic production test, such failure shall be cause for rejection of the periodic production sample and the lot it represents. 4.7 Examination and test methods The sample size shall
25、be as specified in the contract or 4.7.1 5 herein. Preparation for delivery. The packaging shall be examined to determine conformance to 4.7.2 1475914 or Drawing 3212233 to determine compliance with the specification and applicable drawings. 4.7.3 Soldering examination ()loi). (See 4.9). Examine all
26、 soldered connections for excess solder or cold solder joints. tended discoloration of the contacts as caused from overheating. Visual examination. Each switch shall be visually examined in accordance with Drawing Look for loose solder between the terminal pins. Observe for ex- Provided by IHSNot fo
27、r ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-2L720C 13 W 7797706 03OLLO O W MILi-S-21920C(OS ) TABLE I - INSPECTION PROCEDURES (1) INSPECTION CLASSIFICATIONS Title of Examination Requirement Efethod First Quality Periodic or Test Paragraph Paragraph Article Conf
28、ormance Production Preparation for delivery Visual Cap assembly Safety pin Leakage Pressure response Operating position Insulation resistance Contact resistance Torque 5 3.3.1, 3.3.2, 3.6, and 3.7 3.4.2 3.4.5 3.4.7 3.4.8 3.4.11 3.4.9 3.4.10 3.4.6 mvironmenta (3 groups) Group (A) Vibration 3.5.1 Shoc
29、k 3.5.2 Group ( B) Storage Temperature 3.5.3.2 Group (C) Operating Temperature 3.5.3.1 (High and Low) Ruggedness 3.5.4.1 Safety 3.5.4.2 Soldering Examination 3.3.4 Bridge wire 3.4.1 Piston flange 3.4.3 Retaining rings 3.4.4 Threads 3.3.3 4.7.1 4.7.2 4.7.5 4.7.8 4.7.10 (6) 4.7.11.1 (6) 4.7.11 . 4.7.E
30、i.2 (6) 4.7.11.3 (6) 4.7.9 (7) 4.8 4.8.1 4.8.2 4.8.3.2 4.8.3.1 4.8.4.1 4.8.4.2 4.7.3 4.7.4 4.7.6 4.7.7 4.7.2 1 2 (2) 3 4 5 6 7 8 9 10 11 (4) 12 (4) 13 (4) 14 (4) 15 (5) 16 17 18 . 19 20 21 2 (2) 3 4 5 6 7 8 9 10 NOTES (1) Inspections shall be performed in successive numerical order for the first and
31、 periodic production samples. (2) These inspectians shall be performed as applicable without disassembly of the switch, (3) Quality conformance inspection shall be an in-process inspection performed during assembly of the switches prior to delivery. the manufacturer. (4) Repeat tests 5 through 9 aft
32、er vibration, shock, and group B tests. (5) Repeat tests 5, 8, and 9 after ruggedness tests. (6) The test method used shall be the one designated herein for the I1modll of the switch being tested. (7) This is a sampling test. The sequence of inspection shall be at the discretion of 5 Provided by IHS
33、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-21920C( OS) 4.7.4 within the contact assembly, apply an 8.9 + O, - 0.9N (2 t O, - 0.2 pounds) pull to the bridge wire ip a direction along the axis of the connector assembly. veris that the bridge wire is not lo
34、ose. that the resistance between terminals I and J does not exceed 0.1 ohm. 4.7.5 With the Retaining Ring, 1-S 16624-5056, securing the cap within the bell, hold the bell and manually rotate the cap at least- 365 degrees wthin the bell while verifying that there is no binding between the cap and bel
35、l. 4.7.6 Before assembly of the diaphragm with the piston, ex- amine carefully the edge of the inner groove provided in the piston flange, and against which the diaphragm is clamped, for the presenee of a sharp cutting edge. the groove is in accordance with the applicable drawing. Bridge wire test (
36、1.1102). After the soldering operation securing the bridge wire After the pull test Using the Resistance Bridge, Item 4.3e., veri3 Cap Assembly test (14103). Piston flange test (1.1104). Verify that the radius of 4.7.7 the retaining ring to assure that it is properly seated within the piston groove.
37、 assembly of the switch, inspect the retaining ring securing the cap assembly and diaphragm to the body to assure that it is properly seated within the body groove. 4.7.8 gages the notch in the piston when the safety pin is inserted and that the piston is locked in the retracted (open-circuit) posit
38、ion. 4.7.9 tightening direction a torque of 0,452 N-m (4 pound-inches) to the nuts securing the contact assembly to the body. 4.7.10 Leakage test. Retaining ring test (M105). After assembling the diaphragm to the piston, examine After final Safety pin test (MiO6). At atmospheric pressure, observe th
39、at the safety pin en- Torque test (Sampling) (1.1107). Using the Torque Wrench, Item 4.3b., apply in a bserve the nuts for turning during the torque application. 4.7.10.1 Set Mark 250 with sea side of the switch down and exposed to the pressure of the pressure cham- ber. Keep the secondary opening i
40、n the plastic chamber open when the pressure in the pressure chamber is changing and closed during the testing interval when the pressure in the pi-essure chamber is constant. Allow 30 seconds for creep of the diaphragm; then close the secondary opening in the plastic chamber. Kovement of the oil in
41、 the sloping section of the manometer tube at a rate of 25mm (1.0 inch) or more in 30 seconds indicates leakage. With the device so mounted, increase the pressure in the pressure chamber to 407 kPa (59 PSIG). manometer at a rate of 25mm (1.0 inch) or more in 30 seconds indicates leakage. During the
42、foregoing test maintain the switch and the plastic cover at a constant temperature to prevent erroneous results in the mmometer reading. in the test chamber. 4.7.10.2 Hark 250 with sea side of the switch down and exposed to the pressure of the pressure chamber. Cover the other side of the switch wit
43、h the plastic chamber connected to the manometer. the secondary opening in the plastic cham3e.r open when the pressure in the pressure chamber is changing and closed during the testing interval when the pressure in the pi-essure chamber is constant. for creep of the diaphragm; then close the seconda
44、ry opening in the plastic chamber. of the oil in the sloping section of the manometer tube at a rate of 25wm (1.0 inch) or more in 30 seconds indicates leakage. chamber to 407 kPa (59 PSIG). a rate of 25mm (1.0 hch) or more in 30 seconds indicates leakage. maintain the switch and the plastic cover a
45、t a constant temperature to prevent erroneous results in the manometer reading. 4.7.11 Subject one group to the following tests in the sea-side-up position, one group in the sea-side- down position,and one group with the longitudinal axis in the horizontal position. Mark 41 Mod O (M108). Mount the s
46、witch, with the safety pin removed, in the Test Cover the other side of the switch with the plastic chamber connected to the manometer. Increase the pressure in the pressure chamber to 83 2 3.5 kPa (12 * 0.5 PSIG). Movement of the oil in tne sloping section of the Remove the plastic chamber and leav
47、e the switch Hark 41 Mod 1 (H109). Mount the switch, with safety pin removed, in the Test Set Keep Increase the pressure in the pressure chamber to 55 kPa (8.0 PSIG). Allow 30 seconds Novernent With the device so mounted, .increase the pressure in the pressure Movement of the oil in the sloping sect
48、ion of the manometer at During the foregoing test Remove the plastic chamber and leave the switch in the test chamber. O-. Divide each lot or sample into three equal groups. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-21920C 13 9 9979906
49、0301832 4 9 MIL-S-219 20C( OS) 4.7.11.1 Pressure response tests. 4.7.11.1.1 With the switch mounted in the Test Set Nark 250, turn the PRESSURE CONTROL to SLOW INTAKE and increase the pressure in the pressure pot to 211 kPa (30.6 PSIG) and then. to 261 kPa (37.8 PSIG). Verify the closure of all four switches in the hydro- static switch at the higher pressure. 4.7.11.1.2 PRESSURE ONTROL to SLOW INTAKE and increase the pressure in the pressure pot to 34.5 kPa (5.0 PSIG) and then to 62 kPa (9.0 PSIG).
