1、 . . . . - . .- . . - . . . . . r . t“:T:.:n: E:“ _-. .I_ t MIL- S -2 19 19 B ( OS ) 11 July 1975 SUPERSEDING MIL-S-21919A( OS) t:.:. . 4 January 1967 . , .-.- . . . . . - _-.- -_-.- . -.-. -.-*.- - - . - . -. . . . . . MILITARY SPECIFICATION .-. . SWITCH, HYDROSTATIC, MARK 42 MOD O This specificati
2、on is approved for use by all Departments and Agencies of the Department of Defense. . 1 .SCOPE f ,- -.:;:;:; , .- . . . . . . . 1.1 Scope. This specification establishes the requirements for the procurement of the , . . . . . . . Switch, Hydrostatic, Mark 42 Mod O, Naval Sea Systems Command LD 2994
3、50. The hydrostatic switch is of one type and one class. E:“:z.L.z . ?-.:y .-*-. ,.-_-.-. .- _. -.-I _._._ - 2 APPLICABLE DOCUMENTS . ., -.-.-I . ._ -.- , . _.-.*.- . 2.1 The following documents, of the issue in effect on the date of invitation for bids or request foq proposal, form a part of this s
4、pecification to the extent specified herein. c:.l:-:. . -. , . . I rz-.*-z . STANDARDS _ . . . . * . . ,._. _. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-switch is connected with external circuitry. open position by means of a pair of locking pa
5、wls retained in the locking position by an en- closing cap and safety pin. Upon removal of the safety pin, a spring urges the cap clear of the pawls to free a diaphragm and piston assembly which respon. . .;z;II:; ,. ,. . . . . - . . c. . I . I . . . f . .: .- I._. . , . ,. . L . . . I . . . .-. . -
6、 . - . -. I . - . ,A. I -_._-_.- _._- ._ ._.- .- -. . . -. - -.- -. 6: F“. - . _- -_-.;TxT.l - . + -.- a - . , . . . . . . . . -.-.-I.- ._-.- . . I. ,.-_ . I ._- . - 4 3.3 General requirements. I 3.3.1 as specified herein. Fabrication. The switch shall be manufactured in accordance with LD 299450 an
7、d 3.3.2 Interchangeability. Component parts of assemblied units (unless otherwise speci- fied on the applicable drawings) fabricated in accordance with applicable drawings shall be interchangeable and shall assemble with mating components of the unit without selection or fitting . 3.3.3 National Bur
8、eau of Standards Handbook H28. Threads. nless otherwise specified, al1,thpeads shall be in accordance with the 3.3.4 Soldering. Soldering shall be in accordance with Requirement 5 of MIGSTLb454. 3.4 following performance requirements and product characteristics: Performance requirements and product
9、characteristics. The switch shall meet the 3.4.1 center terminals (I and J) of the connector, the shorting bar shall withstand a pull of 8.9 newtons (N) (2-pound force) without loosening or affecting the electrical resistance between the connected terminals. After an 8.9-N (2-pound) pull on the shor
10、ting bar, the resistance between terminals I and J shall not exceed 0.1 ohm. Shorting bar. After soldering the Shorting Bar, Drawing ll91214, between the two See 6.4 3.4.2 ll9.1212, within the Cap, Drawing 1517946, the pins shall withstand an 8.9-N (2-pound) force without separating from the cap. no
11、t to alter either the outer or inner diameters of the cap. Pin staking. After staking the Pins, Drawing 1191211, securing the Pawls, Drawing The staking operation shall be conducted such a manner as 3.4.3 to the Cap, Drawing 1517946, shall be installed in such a manner as not to alter the inside dia
12、meter of the cap. Pin installation. The Pins, Drawing 2414074, securing the Sleeve, Drawing 1246982, 3.4.4 be capable of 365 degrees manual rotation within the bell of the Cap Assembly, Drawing 1518061, without binding. Cap assembly. Before and after switch assembly, the cap, including sleeve, shall
13、 3.4.5 Retaining rings. Following assembly, all retaining. rings shall be fully seated in their respective grooves. each instance, be compressed sufficiently to clear the ring groove before the rings are mounted. To insure proper seating of the rings, the diaphragm shall, in 3.4.6 Before mounting th
14、e piston assembly within the body, the Pin, Drawing 1558829, that locks the piston in the closed-circuit position within the body shall depress into the piston flange to the solid height of the spring and release to the fully extended position without evidence of binding or sticking. Pin depression
15、and release. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-23737B 23 9779706 0303798 3 H MIL-S-21919B(OS) . , . . 3.4.7 The piston shall release from its depressed and locked position as a 1.27mm (0.050-inch) diameter pin is inserted into the
16、 1.78m (0.070-inch) diameter hole in the side of the body sufficiently to disengage the pin from the internal body groove. Piston release. - . /:!:.-:.-.-. . %_._ - . . . . . 3.4.8 over the cap, the safety wire holes in the sleeve and cap shall so align with the groove in the piston as to permit eas
17、y insertion of the safety wire to locking position with the piston. 3.4.9 stand without movement a torque of 0.452N-metre (N-m) (4.0 pound-inches) maximum applied in the came direction in which the nuts were tightened. Safety wire. When the sleeve, with spring, is depressed to shouldering positiai ,
18、Torque. Following assembly of the switch, the Nuts, Drawing 2418050, shall with- 3.4.10 kilopascals (kPa) (13.0 PSIG), the pawls shall release and free the piston, which shall move to the extended position, closing all chcuits through the switch to meet the contact resistance requirements of 3.3.14.
19、 3.4.11 kilopascals d12 and 59 PSIG). 3.4.12 Insulation resistance. The insulation resistance between each of the conductive elements and between each of the conductive elements and the remainder of the metallic elements of the switch shall be 50 megohms or greater when measured at 500 P 50 volts DC
20、. Low pressure pawl release. When the switch is subjectedto a pressure of 90 The switch shall then remain closed. Leaka e. The switch shall withstand, without leakage, air pressures of 83 and 407 3.4.13 below 27.6 kPa (4.0 PSIG). Pressure response. All four switch circuits shall remain open at any p
21、ressure 3.4.14 The contact resistance of each switch circuit, with the switch closed, shall be no greater than 0.2 ohm as measured under a maximum potential of 5.5 volts DC. Contact resistance. 3.4.15 manner to meet all requirements of this specification in the following positions: up; (b) sea side
22、down; (c) switch axis horizontal. 3.4.16 The static magnetic effect of the switbh shall not cause a total change in the flux density of the background hagnetic field of more than 10 nanoteslas (0.10 milligauss) (peak to trough). 3.5 hvironrnenta1.requirement.s. 3.5.1 terstics of this specification a
23、fter being vibrated in accordance with 4.8.1. 3.5.2 istics of thGecification after being shocked in accordance with 4.8.2. 3.5.3 Temperature. 3.5.3.1 requirements and product characteristics of this specification at any temperature between - 3OC and 34OC (26OF and 93OF). 3.5.3.2 TEMPERATURE AND HUMI
24、DITY CYCLE defined in MIL-STD-331, Test Method 105, except that the relative humidity in the chamber need not exceed room ambient or dient as controlled. 3.5.4 High pressure. 3.5.4.1 pressure for three minutes and shall show no evidence of leakage. 3.5.4.2 unsafe by closing of the contacts,4.14 MPa
25、(600 PSIG) hydraulic pressure for no less than 3 minutes. Operating position. Unless otherwise specified, the switch shall operate in a (a) sea side Nonmagnetic requirement. Vibration. The switch shall meet all performance requirements and product charac- Shock. The switch shall meet all performance
26、 requirements and product characte- Operating temperature. The switch shall operate in a manner to meet all performance Storage temperature. The switch shall withstand without damage ne 14-day JAN Ruggedness. The switch shall withstand without damage 4.14 MPa (600 PSIG) hydraulic Safety. With the sa
27、fety pin in place, the switch shall withstand, without becoming . / 3 . . . . . . . . . . . . ._- -.-_. . l:2:.:.2-:z; .- 4 - . . . I. li l:.: , . I. . . . , . . . L. . . . . . . . “ . - . . . . . . . . .- _._- . . . *._ - . e . . . ,. I I_ . - . ,.- . -. . .- . -. . -. . “.-.I .: - . . c tx:.: k/-.
28、j.E;:.x;: . . . . - . . . . . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.6 be thoroughly cleaned of loose or excess solder, metal chips, and other Cleanup. Prior to final assembly, all parts, components, and the assembly shall foreign matter.
29、. -.- . I . . . 3.7 Workmanship Workmanship shall be in accordance rith Requirement 9 of MIL-STD-454. 4 QUALITY ASSURANCE PROVISIONS 4.1 Unless otherwise specified in the contract or pur- chase order, the supplier is responsible for the performance of all inspection requirements as specified herein,
30、 his own or any other facilities suitable 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 pr
31、escribed requirements. Responsibility for inspection. Except as otherwise specified in the contract or order, the supplier may use The Government reserves the right to 4.2 as follows: Classification of inspections. Inspection of hydrostatic switch shall be classified a. b. c. First article inspectio
32、n (see 4.4) Quality conformance inspection (see 4,5) Periodic production sample inspection (see 4.6) 4.3 tests required in this specification: Test equipment. The following ite.ms of test equipment are required to perform the a. Test Set Mark 250 type with Accessory Set Mark 5 Mod O and Accessory Se
33、t Mark- 13 Mod O (Government-furnished (see 6.2d). b. A torque wrench capable of applying a .565 Nom (5 pound-inch) torque with an accuracy of ? 2 percent. c. Test Set Mark 115 type with Adapter Mark 36 Mod O and Magnetic Effects Test Stand Mark 9 Mod O (Government furnished). d. A test chamber.capa
34、ble of withstanding an internal pressure of 4.14 MPa (600 PSIG) hydrostatic pressure and capable of accepting a switch. e. A pull tester capable of measuring a pull of 8.9-N to 22.2-P (2 to 5 pounds). f. of 0.1 ohm, accuracy 1 percent. A resistance bridge capable of measuring a resistance of 1 ohm i
35、n increments 4.4 First article inspection. 4.4.1 First articles shall be subjected to the examinations and tests designated in Table I. Government testing activity, through testing and subsequent analysis of the test results, is assured of contractor conformance to the contract technical requirement
36、s. acceptance may be granted at the option of the Government based on analysis of detected defects. or unauthorized materials are found. (See 6.B.) First article sample. First article sample approval will be granted when the Conditional A first article sample may be disapproved when either nonconfor
37、ming characteristics 4.5 Quality conformance inspection, 4.5.1 and tests designated in Table I. regarding the unit as defective. 100% inspection. During assembly, each unit shall be subjected to the examinations Any unit containing one or more defects shall be cause for 4.5.2 random sample of switch
38、es selected from each production lot (see 6.3.2) in accordance with MIL-STD-105, Inspection Level II, AQL of 1.0 percent defective. (see 6.2f), a production lot shall consist of one months production. in accordance with MIL-STD-105; Section 5. sampling test shall reject the defective unit and shall
39、result in rejection of the lot it Sampling. Tests designated as sampling tests in Table I shall be conducted on a Unless otherwise specified Lot composition shall be Failure of any unit to pass any quality conformance 4 _-. . /:- r: . . . .- - . . .- . . . . . . -. . . . c) I . . . . I 1 . . . . I I
40、 . . . . - k: .:.:.:.:.: :. 1 L . . ._ . t. . L . 4 - , . , . . . -.-. 3 . F; :y.:. . . . . . . . . . . i 1: -:. . .-_ . .-. .: ./ .;:. . i . . . ! :I 3 , . . . . . . . - .- . I . I . A . -.-. . _-. . . - . . . . . . . _-.- -,- . . . . . . . *. Provided by IHSNot for ResaleNo reproduction or network
41、ing permitted without license from IHS-,-,-.:.: . -. . -. . _.- -. -.- . . . . . . . . Preparation for delivery 5 4.7.1 1 1 Visual . 3.3.1, 3.3.2 . 4.7.2 2 (2) (3) 2 (2) Cap assembly 3.4.4 4.7.7 3 (3) (6) 3 . Piston release 3.4.7 4.7.10 4 (3) 4 3.6 and 3.7 . I . . . . ._I. C. :, I L. . t:.: ). I .-.
42、 “ - - tIIL-S-2LSLSB 13 7793706 03OLBOO A m. . . t : I . .-. TABLE I - INSPECTION PROCEDURES (T) INSPECTION CLASSIFICATIONS . :I . :1 ,-.- . -. . -. . _- _ _-.- . *.- . - +- *- -. - . . . _- . . . 1 e akage 3.4.11 . 4.7.14 8 (3) 8 Insulation resistance 3.4.12 4.7.15 9 (3) 9 Pressure response 3.4.13
43、4.7.16 10 . (3) 10 Contact resistance 3.4.14 4.7.17 11 (3) 11 Operating position 3.4 ., 15 4.7.18 12 (3) 12 Nonmagnetic requirements 3.4.16 4.7.19 13 (3) 13 . . . . . “ . . . - _-.-. . . - . .-. . I - - . . . -_-* . .- . .- . . - I- . hvimnmental (3 groups) 4.8 Group (A) Vibration 3.5.1 4.8.1 14 (4)
44、 14 (4) Shock 3.5.2 4.8.2 15 (4) 15 i4j -. Group (B) ;:Y . . Storage temperature 3.5.3.2 4.8.3.2 16 (4) 16 (4) Group (Cl Operating temperature 3.5.3.1 4.8.3.1 17 (High and low) Ruggedness 3.5.4.1 4.8.4.1 18 (5) Safety 3.5; 4.2 4.8.4.2 19 17 18 (5) 19 . . - _-_ . i Threads 3.3.3 4.7.2 20 (3) 20 Solde
45、ring 3.3.4 4.7.3 21 (3 1 21 Shorting bar 3.4.1 4.7.4 22 (3 1 22 Pin staking 3.4.2 4.7.5 23 (3 1 23 Pin installation 3.4.3 4.7.6 , 24 (3 1 24 Retaining rings 3.4.5 4.7.8 25 (3 1 25 Pin depmssion and 3.4.6 4.7.9 26 (3) 26 release NOTES Inspections shall be performed in successive numerical order for t
46、he first article and These inspections shaL1. be performed as applicable without disassembly of the switch. Quality conformance inspection shall be an in-process inspection performed during assembly Repeat steps 8 through 11 after vibration, shock, and group B tests. Repeat steps 8, 9, and 11 after
47、ruggedness test. This test shall also be performed on the assembled switch. This is a sampling test. 1. periodic production samples. 2. 3. of the switches prior to delivery. the manufacturer. 4. 5. 6. 7. The sequence of inspection shall be at the discretion of _-. - . , . . . I : .-_ -. :.;.;i . r.-.-.:.*.*. .Y.-. 7 . _.- , L. . , . I . i i I . . . . .- . -a .- -.- . * . . p.- -. - . -. t:. . . . . . . . . , 5 A . . . . Provided by IHSNot for ResaleNo re
