1、Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-8244.0 (OS) 3.3.2 Valve closure. With the pilot pressure removed the valve shall close. There shal
2、l be no leakage between the inlet and outlet ports. 3.3.3 Pilot cylinder leakage. The pilot cylinder shall not leak with a pressure of 4500 psig applied to the pilot port for a period of five minutes. 3.4 Environmental requirements. Un-less otherwise specified, the valve shall be capable of conformi
3、ng to the performance requirements and product characteristics of the specification after being exposed to the environmental conditions specified in this section. For definitions of .ready, operating, and non-operating see 6.3.1, 6.3.2, and 6.3.3. 3.4 .I The valve, mounted as shown in Figure 1, shal
4、l be capable of meeting the performance requirements after being subjected, in the ready condition, to the vibrations defined in Table I. The valve shall be vibrated for 180 minutes each in its longi- tudinal axis and in two mutually perpendicular transverse axes at any temperature within the range
5、of -45“ F to +140“ F. Vibration is defined in 6.3.4. Vibration, ready condition. TABLE I VIBRATION SCHEDULE I I Double Amplitude Acce lera t ion Frequency (CPS) (in. +_ 10%) Minimum (gs f 10%) Minimum - 3 .O lo - 5 - 22 22 - 40 40 - 74 74 - 500 I L 3.4.2 Figure 1, shall be capable of meeting the per
6、formance requirements after being subjected, in the ready condition, to the accelerations defined in Table II for a duration of lminute foreach magnitude. Acceleration is defined in 6.3.5. Acceleration, ready condition. The valve, mounted as shown in . -7 P 3 - Provided by IHSNot for ResaleNo reprod
7、uction or networking permitted without license from IHS-,-,-III. Shock is defined in 6,3.6. TABLE III SHOCK SCHEDULE Peak Direction of Number Test Magnitude Duration Impact Deceleration Of Sequence (gs f 10%) (ms) Axis Force Impacts 1 300 0.5 to 1.5 Longitudinal Aft 3 2 85 0.5 to 1.5 Transverse A Op
8、tional 3 3 85 0.5 to 1.5 Transverse B Optiotia 3 4 45 18.0 to 20.0 Longitudinal Fwd 3 5 60 8.0 to 10.0 Longitudinal Aft 3 6 60 8.0 to 10.0 Longitudinal Fwd 3 .7 60 8.0 to 10.0 Transverse A Optional 3 8 60 8.0 to 10.0 Transverse B Optional 3. 3.4.4. Temperature and humidity. 3.4.4.1 Non-operating. Pr
9、ovided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-82440 (OS) 3.4.4.2 Ready, operating. The valve immediately after being condi- tioned for 1 hour at any temperature between O“ F and +140“ F shall be capable of meetiig the performance requirements a
10、t any environmental temperature between O“ F and +140“ F. 3.5 Operational service life. The valve shall have a service life of 20 duty cycles. 3.6 Workmanship. The workmanship and finish shall be of sufficiently high grade to insure satisfactory operation consistent with the requirements of this spe
11、cification. The assembly shall be thoroughly clean and free of excess materials, chips, and loose or spattered foreign materials. production sample, subject to any qualification stated in the Govern- ments notice of approval, shall be determinative of the recpirements of the contract relative to wor
12、kmanship insofar as not specifically covered . by applicable specifications. The standards of workmanship exhibited in any approved. pre- . 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Uniess otherwise specified in the contract or purchase order, the supplier is responsible for
13、 the as otherwise specified, the supplier may utilize his own facilities or any comercial laboratory acceptable to the Govefnment. ment reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conf
14、orm to prescribed requirements. . . performance of all inspection requirements as specified herein. Except The Govern- 4.2 Classification of inspection. Inspection of the va1v.e shall be classified as follows: - a. Preproduction inspection (Subsection 4.4) . - b. Acceptance inspection (Subsection 4.
15、5) - c. Periodic inspection (Subsection k.6) . - d. Examination of first echelon repair parts (Subsection 4.7) 4.3 . Sampling. 3 4.3.1 Preproductin inspection sample. A preproduction sample of 6 valves manufactured in accordance with 3.2 shall be subjected to the preproduction tests listed in Table
16、IV and detailed in 4.4 through 4.4.4.10 at an activity designated by the procuring activity. preproduction sample shall be based on no defects in the-sample. Further production of the valve by the supplier, prior to approval of the Acceptance of the See 4.4.6. preproduction sample shall be at the su
17、ppliers- risk. 5 -* r -=+ ? - - - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-2440 13 777770b 03bO48 I M 4.4.2 TABLE IV PREPRODUCTION TEST SEQ
18、UENCE Paragraph Test Sequence Tests Reference A B C Operational Test Vibration, Ready Condition Acceleration, Ready Condition . Shock, Ready Condition Operational Test Temperature and Humidity Low Temperature, Operating High Tempeyature , Operating Vibration, Packed and Packaged Shock, Packed and Pa
19、ckaged Operational Test Operational Service Life 4.4.4.1 1 4.4.4.2 2 4.4.4.3 4.4.4.4 4.4.4.1 3 4.4.4.5 4 4.4.4.6 5 4.4.4.7 4.4.4.8 4.4.4.9 4.4.4.1 . 4.4.4.10 6 1 1 2 3 4 5 6 2 3 4 Test conditions. Unless otherwise specified, the valve shall be subjected to the tests in 4.4.1 under the following cond
20、itions: - a. Temperature: i. . Altitude: - c. Vibration: - d. Humidity: Room ambient +32O F to +98“ F Normal ground atmospheric pressure None Room ambient 4.4.3 Test equipment and Set-up. In addition to the items listed in 4.5.3, test equipment is required which provides the following characteristic
21、s: . 4.4.3.1 Vibration equipment with temperature chamber. The vibration equipment with temperature chamber shall have the following characteristics: - a. Frequency range, logarithmic sweep: 5 to 500 cycles per - b. Test specimen: 3 pounds - c. second (cps) Acceleration and displacement (ready condi
22、tion): 5 to 22 cps 22 to 40 cps 40 to 74 cps 74 to 500 cps 0.2 inch 3.0 gravitational units (gs) 0.036 inch 10 gs Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-82440 13 m 977970b 0360849 3 m MIL-V-$2440 (OS) - d. I Acceleration (packed and pa
23、ckaged): 5 to 60 cps Ig - e. Automatic cycling time range: O to 5 minutes ,Jptional - f. Temperature chamber range: -45“ F to 4-140“ F accuracy to k 5OF g. Interior size: 2-1/2inches x 3-1/2. inches. x 5-1/2 inches minimum 4.4.3.2 Acceleration equipment. The acceleration equipment shall have the fol
24、lowing characteristics: 35 gs with a 1 pound test specimen. 4.4.3.3 Shock equipment. The shock equipment shall be capable of accepting a 1 pound test specimen and shall providranges of: - a. - b. - c. 300 gs for 0;5 millisecond (ms) to 1.5 ms 60 gs for 8.0 ms to 10.0 ms 45 gs for 18.0 ms$to 20.0 ms
25、4.4.3.4 Temperature and humidity conditioning equipment. One or , more equipments may be utilized to provide the following characteristics: - a. Temperature: -45“ F to 4-140“ F; with an - b. Relative humidity: 95 percent minimum at 4-110 F; - c. Interior size: 2-112 inches x 3-112 inches x accuracy
26、to k 5“ F with an accuracy to k 5“ F .5-1/2 inches minimum . This equipment may be used for both non-operating and ready/operating temperature (and humidity) tests. 4.4.4 Test procedures. t 4.4.4.1 ODerational test:# The valve shall be subjected to the . acceptance tests detailed in 4.5.4.land 4.5.4
27、.2, 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-824LIO 13 W 7777.9Ob 0360850 T MIL-V-8244.0 (OS) 4.4.4.2 Vibration, ready condition. The valve, in the ready condi- tion, shall be mounted in a manner equivalent to that shown in Figure 1. T
28、he resonant modes in each of the 3 axes shall be determined by varying the frequency of applied vibrat.ion slowly from 5 cps to 500 cps. The valve shall then be subjected to resonance and cycling vibration in each axis, in conformance with the times shown in Table V. If more than 4 resonances are en
29、countered on any axis, the 4 most severe resonances shall be chosen for the test. The resonant and cycling period, for each axis, shall be divided into 3 equal parts, which are conducted at -45“ F _+ 5“ F, room temperature and +140“ F f 5“ F respectively. frequency sweep rate shall be used if availa
30、ble; otherwise, other cycling rates of frequency change may be used. The sweep rate shali be such that 15 minutes actual vibration time is required to proceed from.the lower to higher and back to the lower extremity of frequency range in accordance with the accelerations of double amplitudes defined
31、 in Table VI. For cycling,a logarithmic - TABLE V VIBRATION TEST SCHEDULE Number of Resonances O 1 2 3- 4 Total Vibration Time Cycling Time 3 hr 2-1/2 hr 2 hr l-L/2 hr 1 hr. * 30 minutes each resonance at Resonance * 30 min 1 hr 1-1/2 hr 2 hr TABLE VI VIBRATION SCHEDULE I Frequency (cps) 5-22 22-40
32、40-74 74-500 Double Amplitude Acceleration (in. f 10%) Minimum 0.2 . O. 036 10 i I (gs f 10%) Minimum 3 I I 4.4.4 tion, being shall .3 Acceleration, ready condition. The valve, in the ready condi- shall be subjected to the accelerations defined in Table VI1 after secured to an acceleration equipment
33、 (see Figure 1). Acceleration be measured at the. approximate geometric center of the valve. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Acceleration Direction Magnitude (gs maximum transition time shall be 2 hours. The specimen shall subsequentl
34、y be subjected to an environment of +110“ F + 5 -0“ F at a minimum relative humidity of 95 percent for a minimum of 8 hours. Thereafter, 2 valves shall be operated in accordance with 4.4.4.6 and 2 valves shall be operated in accordance with 4.4.4.7. Prior to operation the valves may be wiped dry. or
35、 oven is not permitted. The The specimen shall (As an alternative procedure, the The specimen shall thereafter remain in.the chamber The specimen shall then be subjected to an environmental The specimen Drying by an air blast 4.4.4.6 Low temperature operating. Before testing, the valve, installed in
36、 its test chamber in the ready condition, shall be conditioned at a temperature of O“ F +. 5“ F for a period of 1 hour. Immediately thereafter the valve shall be operated in accordance with and meet the requirements of 4.5.4.land 4.5.4.2 of 4-32“ F 5 5“ F. at an environmental temperature 4.4.4.7 Hig
37、h temperature operating. Before testing, the valve , installed in its test chamber in the ready condition, shall be condi- tioned at a temperature of +140“ F tr 5“ F for a period of 1 hour. Immediately thereafter the valve shall be operated in accordance with and meet the requirements of.4.5.4.1 and
38、 4.5.4.2 at an environmental temperature of +140“ F tr 5“ F. 4.4.4.8 Vibration, packed and packaped. The valve, packed and packaged in accordance with Section 5, shall be vibrated in such a manner as to determine the frequency producing maximum transmissibility within the frequency range of 5 to 60
39、cps. The container shall be fastened, in suitable fashion, to the table of a vibration testing device producing an essentially sine wave motion. The maximum permissible motion freedom shall be approximately 1/32 inch. then be vibrated for 1 hour at the frequency producing maximum trans- missibility
40、and at an input acceleration of 1 g. applied to each of the three principal orthogonal axes! The specimen shall This test shall be Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Shock, packed and packaped. The valve, packed and packaged The valve in
41、 its container shall be dropped from a height of 36 The drops shall be made on an 1 in accordance with Section 5, shall be subjected to free fall drop tests. inches, one drop on each of 4 diagonally opposite corners and flat drops, one each, on the bottom and on one side. impact surface of essential
42、ly non-yielding material such as stone or concrete. of the following conditions: the container has been stabilized at -45“ F f 5“ F, and within 10 minutes after the container has been stabilized at +140 F -t 5“ F. The complete series of drops shall be performed under each room temperature, within. 1
43、0 minutes after 4.4.4.10 Operational service life. The valve shall be subjected to 17 additional duty cycles in accordance with 4.5.4.1 and 4.5.4.2. Test data sheets. All test data shall be recorded on a data sheet by the supplier and maintained as part of the inspection records. shall contain, but
44、are not limited to,. the following information: In addition to the data requirements of 4.5.5, the data sheets Low tempera tu r e Oper at ing Disc severed High temperature operating Disc severed Pres sure Psig Pressure Psig Determination of defect or failure. Failure of a valve to successfully pass
45、any of the tests in 4.4 through 4.4.4.10 shall be cause for rejection of the preproduction sample. Acceptance inspection. Each valve produced under the con- tract or purchase order shall be subjected to -the follcwing tests and examinations: Tests and examinations. x. - Provided by IHSNot for Resale
46、No reproduction or networking permitted without license from IHS-,-,-MIL-V-82440 13 m 7737706 036085Ll 7 W MIL-V-82440 (OS) 4.5.2 Test conditions. Unless otherwise specified, the valve shall be subjected to the acceptance tests under the following conditions: - a. Temperature: d. .Altitude: - c. Vib
47、ration: - d. Humidity: Room ambient +32“ F to +98“ F Normal ground atmoshperic pressure None Room ambient 4.5.3 Test equipment and Set-up. - a. iydraulic supply O to 4700 psig minimum - b. Pressure gage O to 5000 psig, accuracy tr 1/2 percent full scale - c. Dry inert gas supplies O to 470 psig, O t
48、o 160 psig 4.5.4 Test procedures. 4.5.4.1 Disc rupture and valve closure test. The valve shall be assembled to the test fixture in accordance with Figure 1. of 100 tl 10 psig shall be applied to the inlet port. of pressure shall be connected to the pilot port. of 450 psig to the pilot port. the pist
49、on knife to sever the disc. Apply dry inert gas at a supply pressure of 150 tl 10 psig to the inlet port for 5 minutes minimum with the valve submerged in water. shall be no evidence of leakage. the disc. OD of the piston shaft at the knife end has passed through thedtsc. disc material shall remain intergral. A gas
