1、MIL-V-7984 (Aar) 16 October 1952 MILITARY SP!dCIFICAT ION VALVE, PiWJMATIC, AEO 2A This specification ms approved by the Burcjau of Aeronautics, Department of the Navy. 1.1 Thie specification establishes the requirements for the manufaoture, inspectim and testing of a pneumatic solenoid controlled v
2、alve, desigaated as the bro 28 Pneumatic Valve, suitable for controlling the operation of a 20W pneumatic gun charging system operating at pres- sures of 500 to 1500 psi. 2. APPLICABLE SPECIFICATION, OTHW PUBLICATIONS, AND DWWLNa 2.1 The followkg spcificadions, publications, and drawings, cf the iss
3、ue in effect on the date of invitation for bids, form a part of this specification. 2.1.1 SPECIFICATIONS: Federal W-LI-151 Metals, General Specification for inspectim 01 w-c-843 Wadding; Creped Cellulose fiairitary JAN-P-105 JAN-P-106 JAN-P-108 JAN-P-120 JAN-P-125 JAN-P-133 JAN-P-139 YGP-140 MIL-P-5
4、514 Packaging and Packing for herseas Shipment Boxes; Woc, Cleated, Plywood Nailed Packaging and Packing for Overseas Shipment Boxes; ood, Packaging and Packing for Overseas Shipment Boxes; Fiberboard (V-Board and W-Board), Exterior and Interior Packaging and Paoidng for Overseas Shipment Cartons, F
5、olding Packaging and Packing for Overseas Shipmnt Barrier-aterials, Packaging and Packing for Overseas Shipment Boxes) set-up, Paperboard Waterproof, Flexible Paperboard Packaging and Packing for Overseas Shipment Plywood, Container Grads Packaging and Packing for Overseas Shipment Adhesives, mater-
6、 PacMngs; installation and Gland Design of Hydraulic and Resistant, Case-Lines Pneumatio (General Specification for) MIL-P-5618 Pbeumatic Design, installation and Tests in Aircraft MIL-G-4343 (USAF) Grease, pneumatic Licensed by Information Handling ServicesMIL-V-7984 (Aer) MIGP-116 Preservation and
7、 Packaging; Parts and Equipment (General Specification for) Navy Department General Speoification .for Inspection of ! Specifications and Standardsi Usa of =lit ary St andards MSLSTD-129 Marking of Shipments 2.1.3 DRAWNGS Bureau of Aeronautics Sketch No. 51A132ASM for Valvs, Fneumatic, Aero 2A, and
8、all drawings listed therein (Copies of this speoification and applicable specifications, and other publications may be obtained upm applioation to the Cornanding Officer, U, S. Naval Air Station, Johnsville, Pennsylvania, Attention: Teohnical Records Department.) 3. REQuIREmNTs 3.1 Materials.- Uster
9、ials shall oonf om to the applicable specifications as speoified herein ad on the applioable drawings. tions shall be of the best commercial quality, of the lightest practicable weight, and entirely suitablef or the purpose intended, l in the actuating valve, reducing the pressure behind %he main va
10、lve Pistoll, Causing 8YStem PmSSUre to return the piston to its original position, closing the main Volve an opening the outlet ports to atmospheric exhaust. Opera%ion of the solenoid plunger, either electrically or manually, uneeats a ball cheok This sw 2 Licensed by Information Handling ServicesMI
11、L-V-7984 48 m 9999906 0271165 T m L 3.4.2 3.4.3 3.4.4 3.4.5 lti, Vibration, and Shock.- A1titde.- From sea level to 50,003 feet* Temperatura.- From -70% to +16O0F* HddiQ.- mder all conditions of relative humidity at above temratures* Under ail oonditions Of acceleration* vibration and shock present
12、in aircraft during service operation. 3.4.6 3.4.7 Attitude.- Tilted or oriented in any mrinner. Voltage.- The n-al operating voltage shall be twenty-eight volts direct current, Pressure.- The normal operating air pressure shall be 1000 pounds per square inch, butthe Pneumatic Valve shall be capable
13、of satisfactory operation at any pressure between 100 and 1500 pounds per square inoh. but the valve shall be apable of operation at any voltage between 20 and 32 volts. 3.4.8 3.5 Lubrication.- All leather backing rings and O-ring glands shall be lubricated in accordance wiYn Paragraph 4-2-7 of Bpec
14、ificRtiw MIL-P-5514. as per K1L-G-4343 (WAF). covering this typaof equipment for the quantity production of analogous parts. of the pneumatic valve shall have a smooth workmanlike finish, free from flaws, ragged edges, or tool marks. The ier wik a certification by the Bureau Of Aeronautics, together
15、 with a certification by the cognizant inspector that the used in their manufacture aro in accordance with pertinent specifications. 4.3.2 Inspection and Testing cf Preproduction Size 99 or less 100 - 600 500 or more -_ . Indiv. Insp. L Testing (4-5.1) 2 3 4 Proof Pressure (4.6.2) 2 3 4 Burst Pressu
16、re (4.6.3) 2 3 4 Low Temperature (4.6.4) 1 1 1 Salt Water Spray (4.6.5) 1 1 1 Insulation Resistance (4.6.6.) 2 3 4 Dielectrio Breakdown (4.6.7) 2 3 4 Eleotrical Resistance (4.6.8) 2 3 4 Temperature Rise (4.6.9) 1 1 1 Aoceleration Test (4 6 1 O) 1 1 1 Shock Test (4.6.11) 1 1 1 Vibration (4.6.12) 1 1
17、1 Life Test (406.13 ) 1 1 1 4.5 4.5.1 Individual Inspeotim and Testing 4.6.1.1 Production nits - inspection and Testing Visual 1nspeotion.- Each valve offered for acaeptance under the oontracti shall be in- spected visually to insure that it has been properly assembled and that the worlonanship and
18、finishes are in keeping with the intent of this specificetion. 4.5.1.2 Leakage Test.- Vith the outlet ports suitably capped, each valve, without the solenoid, shall be completely immersed in water and subjected +o a static internal gas pressure (air or nitro- gen) of 2250 pounds per square inoh appl
19、ied gradually. “he allowable lealange shall not exceed twenty bubbles per minute through the ball c!iecks and/or the exhaust ports. This leakage test shall first be conducted with the valve in the inoperative position and then with the plunger depressed manually. Upon satisfactory completion of the
20、above test, reduce the gas pressure to 500 pounds per square inch and repeat the above leakage test. 4.6.1.3 Functional Test.- Each valve submitted for aooeptance under the contract shall be The time required for the cwnected as shown in Figure 1, and cycled not less than three times. first three co
21、mplete cyoles shall not exceed 12.0 seconds. 4.5.1.4 Solenoid Pull Test.- Each solenoid assembly shall be tested independently of the valve for solenoid pull. At an ambient temperature of 75OF and with 20 volts D. C. applied to the pull-in coil, the solenoid shall olcse against a dead load of 30. po
22、unds where the air gap is set at .45“. With 20 volts D. C. applied to the holding coil, the solenoid shall hold against a sustained dead load of 35.0 pcuns gradually applied, A Licensed by Information Handling Services4.6 Pests and Test Procedure 4.6.1 General Test Conditions.- Unless othedse specif
23、ied, all tests shall be conducted at an ambient temperature of 75 degrees plus or minus 10 degrees Fahrenheit (240 + 5OC). Test voltago shall be maintained at 27.5 volts, D. C. and gas pressure (air or nitrogen) 1500 pods wr aquare inch. 4.6.2 Proof Pressure Test,- Each valve shall be capeble of wit
24、hstanding a Proof Pressure cf (air or nitrogen) applied graduelly through the inlet Port Of the 2250 pounds per square inch of gas valve. The prescribed pressure shall be naintnined for not less than ten (10) seconds. shall be aotuated after application of proof pressure at normal operating pressure
25、 of 1500 psi. There shall be no evidence of external leakage,. failure or permanent set. The VelVe 4i6.3 -Burst pressure Test.- part of the IVO, minus the solenoid, shall rupture fien subjected to a burst pressure of 3750 PoUadS Pbr square inoh* of 3/8“ tubing at leastP1O feet in length be inserted
26、between the 600 pai reservoir and the valve, and place the mlm, and 10 coil in a cold room having a ,temperature of -65% the oold resistanoe of the hold-ia coil shall be measured and the ambient temperature recorded). ooil shall be capable of being energized conthuouslywith 28 voits, D. Ca .aithout
27、exooedbg a maximum temperature of 135OC (185OF) for olass A insulation or 160OC (370OF) for class B where referred to an ambient temperature of 37.8OC (370OF) for class B where referred to an ambient temperature of 37.8% (1OOoF). between 18OC (64.4OF) and 37.80(: (1000F). continuously until tempratw
28、e stabilization is reached. The temperature shall be determined by the resistance mettod and the following formula shall be used: The solenoid hold-in The unit shall be tested while in 812 ambient bemperature anMere The test voltage shall be 29 volts D.C. applied haximum Temperature OC = (234.5 + To
29、)Rh - (196.7 + Ta) Rc ?here R, = cold resistance of coil Rh = hot resistance of coil TO Ta = ambient temperature (OC) during last quarter of test temperature (OC) of ooil when cold resistance vias masured NOTE: The above lormula has been modified to refer the maximum temperature to a reference ambie
30、nt temperature of 37.8OC (lOOF). 4.6.10 Acceleration Test.- The units to be tasted shall be operated while subjeoted to I10Gs in each of their three major axes. be considered as a failure of the unit to pass the test. Failure to operate under any of these conditions shall 4.6.11 Shock Test.- Eaoh un
31、it to be tested shall be subjeoted to a transient deoeleration force of 1006s in eaoh of its three mjor axis. and measured with an accelercmeter. to meet the perPonuance requirements of paragraph 3.5 after this test, shall be considered a failure of the unit to pass this test. This may be applied by
32、 an impact drop tester Distortion, deformation or breakage of any part, or failure 4.6.12 Vibration Tests 4.6.12.1 Natural Frequency.- The units to be tested shall be vibrated in each of its three principal axes in turn to any electrioal or mechanical failure or the loosening of any part, during the
33、 test, shall be considered as a failure of the unit to pass the test;. pressure of 15O psi and operated by means of the solenoid for 2,000 oyoles. conduoted at a rate which will prevent overheating of the coils. placed in an ambient of zero OF. or 1mer to prevent overheating of the coils. of this te
34、st, the valve shall be examised for external leakage speoified in 4.5.1.2. Vibration shall follm approximately a simple harmoliic motion, The source amplitude shall be .O3 4.6.13 Life Test.- The assembled valve shall be oonneoted to a source of pneumatio This test shall be If neoessary, the unit may
35、 be At the conclusion Licensed by Information Handling Services4.7.1 production Lot Samples.- The failure of any production lot sample to pass the -inspection and tests outlined in 4.4 fuid 4.5 shall cause tentative rejection of all valves repre- sented by that sample, subject to retest as hereinaft
36、er provided, 4.7.2 Individual Inspection and Testing.- The failure of any valve, any piece, sub- assembly, or assembly of the valve to pass the inspection and tests outlined in 4.5.1 and 4.6 above, shall cause its tentative rejection, subject to retest as hereinafter provided. Retests 4.8 4.8.1 prun
37、 charging System. either single-acting or double-acting 2h Fneumatio Gun Chargers in the direct current eleotrioal systems of airoraft operating at a nominal rating of 28 volts and pneumatio souroe of power rated at not over 1500 pounds per square inoh. electrically. It i8 intended to operata in con
38、junotion with It is also intended to operate either manually or 6.2 Drawings and Speoifioations - Conflfot Elimination.- insofar as the contractor is required by provisions of this speoification to adhere rigidly to the drawings listed hereh, whioh may make it impossible in som instances also to oom
39、ply with the perforwoe and test re- quirements speoified herein, in that event the oontractor, should promptly notify the Bureau of hronautios of such fact, and appropriate changes will be made in the applicable drawings, parts or performanos requirements ar authorized by the Burda? of Aeronautics,
40、An equitable adjustment in accordanoe with applicable contraot provisions will be made in tne price of the articles to be delivered to refloot any ohange so authorized by the Bureau of Aeronautios. showing whether or not any exoeptims are being taken to the requirements shm in the drawings ad the al
41、ternative thereto indioated in the statement. 6.3 Information Required With Bids,- and the fact that the Bovernment may have formulated, furnished, or in anyway supplied the said draw- ings, speoifications, or other data, is not to be regarded by implication or otherwise as in any manner licensing t
42、he holder or any other person or corporatio,p, or conveying any rights or per- mission to manufacture, use, or sell any patented invention that may in any way be related thereto, 8 Licensed by Information Handling ServicesMIL-V-1984 (Aer ) U /7M DESCR /P T/ON f/& . e 023855 Licensed by Information Handling Services
