NAVY MIL-V-85245-1979 VALVE RELIEF HYDRAULIC HIGH RESPONSE TYPE II SYSTEMS GENERAL SPECIFICATION FOR《II型系统高响应水压安全阀的一般技术要求》.pdf

1、MIL-V-85245 10 May 1979 MILITARY SPECIFICATION VALVE, RELIEF, HYDRAULIC, HIGH RESPONSE, TYPE II SYSTEMS, GENERAL SPECIFICATION FOR This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE . 1.1 Scope. This specification covers hydraulic high respo

2、nse relief valves for use in Type II aircraft hydraulic systems. 1.2 Classification. Hydraulic high response relief valves shall be furnished in the sizes and pressure settings (classes) listed in the applicable specification sheet. 2. APPLICABLE DOCUMENTS 2.1 Issues of documents. The following docu

3、ments of the issue in effect on date of invitation for bids or-request for proposal, form a part of this specification to the extent specified herein. SPECIFICATIONS Federal PPP-B-566 Boxes, Folding, Paperboard PPP-B-60 1 Box, Wood, Cleated Plywood PPP-B-636 Box, Fiberboard I PPP-B-676 Boxes, Setup

4、Beneficial comments (recommenda Of the total number of cycles, 100,000 cycles shall be performed qt high tempera- ture as defined below. The balance shall be performed as defined below for intermediate temperature cycling. 4. 7.8.1 High temperature cycling, The valve shall be subjected to 100,000 cy

5、cles with the inlet fluid temperature at 2750 4- 50F. Upon completion sf the 100,000 cycles the specimen shall be soakd at 2750 + 5OF for one (1) hour with 90% of the reseat pressure applied to inlet port, The pressure shall then be relieved and the specimen soaked for one (1) hour at 2750 4- 5OF. T

6、he temperature shall then be stabilized at normal room CemperatuFe conditions and the performance tests of paragraph 4.7 . 4.1 through 4.7 . 4.3 shall be performed Leakage shall be a maximum of 2 times the original values per Table III of the applicable specifica- tion sheet . 4.7.8.2 Intermedidte t

7、emperature cycling. The valve shall then be subjected to 900,000 cycles with an inlet fluid temperature of 1800F to 190F. At a minimum of three times during the endurance tests and upon completion of the test, stabilize the temperatures at normal room temperature conditions and conduct the performan

8、ce tests of paragraph 4.7.4.1 thru 4.7.4.3. Leakage shall be a maximum of 2 times the original values per Table III of the applicable specification sheet. 4.7.9 Impulse. With the valve set to !he appropriate class (set to the highest pressure class if adjustable to more than one class), and the outl

9、et port plugged the valve shall be subjected to 100,000 impulse cycles, 25,000 at a fluid temperature of 275O.F and 75,000 at a fluid temperature of 225OF. Each impulse cycle shall consist of a pressure rise from zero to 3,000 psi and drop to zero. During each pressure increase, a peak surge pressur

10、e of 1.43 to 1.57 times the working pressure (3000 psi), as shown by an oscillograph, shall be obtained, Cycling shall be performed at a rate of 300 cycles per minute (cpm) maximum. There shall be no evidence of external leakage or structural failure during the performance of this test. See Figure 3

11、 for impulse curve, The actual impulse pattern shall be recorded and reported. 4.7.10 Vibration. With the valve set to the appropriate class (set to the highest pressure class if adjustable to more than one class) a sinusoidal vibration test shall be conducted on the valve at room temperature in eac

12、h of the valve three mutually perpendicular axes. One of these axes shall be that which is parallel to the valve poppet axes. The valve shall be mounted on a resonance-free fixture for test. The vibration input accelerometer shall be mounted on the fixture close to the mounting point of the valv to

13、the fixture. A second accelerometer shall be mounted directly on the valve for monitoring resonant frequencies. 14 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-LL O MIL-V-85245.Lb m 7777906 020b544 I MIL-V-85245 I50 125 100 75 50 25 O THE CURVE SH

14、OWN ABOVE IS THE APPROXIMATE PRESSURE-TIME CYCLE DETERMINED TO BE OF P-ROPER SEVERITY FOR IMPULSE .TESTING. ALTHOUGH IT IS MANDATORY ONLY THAT PRESSURE PEAK RISES TO 150 PERCENT OF THE OPERATING PRESSURE AT SOME POINT PRIOR TO LEVELING OFF AT RATED PRESSURE, IT- IS CONSIDERED HIGHLY DESIRABLE THAT T

15、HE PRESSURE-TIME CURVE BE CONFINED TO THE SHADED AREA INDICATED. ONE VERY DESIRABLE-BENEFIT TO BE GAINED IN THIS MANNER IS THAT RESULTS OF TESTS PERFORMED ON DIFFERENT TEST MACHINES WILL BE MORE NEARLY COMPARABLE. INITIAL RATE OF RISE PRESSURE APPLICATION TO BE 200,000-300,000 PSI PER SECOND. FIGURE

16、 3. 1mpuIse.curve 15 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-85245 The rate of change of frequency shall be logarithmic. Vibration Tolerances. Amplitude - -1- 10% Frequency “ 2% Acceleration 3- 10% - The Eollowing tests shall be conduct

17、ed: a, Resonance search, Resonant frequencies of the valve shall be determined by varying the frequency of applied vibration slowly through the range specified in Table II, Part 1, at reduced levels but with sufficient amplitude to excite them, This shall be repeated for each of the three axes, b. R

18、esonance dwell, The valve shall be vibrated along each axis at the four most severe resonant frequencies. (determined in the resonance search) for 30 minutes at each resonance, The vibration levels and test times shallbe per Table II, Part 1. c, Cycling test. The valve shall be vibrated along each a

19、xis in accordance with the test levels, frequency range and times from Table IT, Parts 1 and 2, The frequency of applied vibration shall be swept over the frequency range of 5 to 2000 to 5 Hz logarithmically. The time to sweep from 5 to 2000 to 5 Hz shall be approximately 20 minutes, If a change in

20、the resonant frequency occurs during the test, its time of occurence shall be recorded and immediately $he frequency shall be adjusted to maintain the peak resonance condition, The final resonance frequency shall be recorded. 4e7*10* 1 Tests after vibration. After the vibration test, the valve shall

21、 be tested in accordance with paragraph 4.7,4,1 and 4,7.4,3 and meet the requirements therein, 4.7* 11 Burst pressure. Pressure shall be applied to the pressure port with the return port plugged with a hand pump at a maximum rate of increase of 25,000 psi- per minute until the specified burst pressu

22、re of 7,500 psi is reached. The valve shall show no leakage in the form of drops or rupture of internal or external parts at this pressure when held for 2 minutes. The pressure may be increased above that specified during qualification tests in order to secure data on actual burst pressure, The test

23、 shall be conducted with the valve and fluid maintained at 2750F after a 5-hour soak at 275OF with the valve filled with test fluid. 4.8 Packaging. Packaging shall be examined- or conformance to Section 5. 16 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from I

24、HS-,-,-Part 1 Part 2 MIL-V-85245 TABLE II. Test procedure and time schedule. I Vibration Level Frequency Band, Hz 0.1 inch double amplitude 0.036 inch double amplitude 1.0 g 10.0 g O. 2 inch double amplitude O. 06 inch. double amplitude 1.0 g 20.0 g 5 to 14 14 to 23 23 to 74 74 to 2000 5 to 10 10 to

25、 18 18 to 81 81 to 2000 Vibration Time Schedule - (Time Per One Axis) Part 1 4 3 2 1 O Number of Resonances Total Vibration Tim at 30 minutes cycling per axis - no resonance dwell . Part 2 O % hr 1 hr 1% hr 2 hr Cycling Time each Resonance 2 hr 1% hr 1 hr hr O 5. PACJQIGING 5.1 Preservation and pack

26、aging. Preservation and packaging shall be in accordance with MIL-STD-794, level A, B or C as specified. (See 6.2) 5.1.1 Level A 5.1.1.1 Cleaning. Prior to preservation, the valve shall be cleaned ultrasonically (or.equivalent method) until free from all metal chips, grip, dirt, and other foreign ma

27、tter. The cleaning method utilized shall not have deleterious effects on any material (e.g, metals, plastics, elastomers, etc.) Care shall be taken after cleaning to insure that the .valve is not contaminated prior to or during preservation or packaging. 5.1.1.2 Preservation. The valve shall be flus

28、hed and filled 80 to 90 percent with Hydraulic Fluid conforming to MIL-H-6083, pre- filtered through a filter assembly conforming to MIL-F-81836 and sealed with metal closures conforming to metal MIL-C-5501. 17 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from

29、 IHS-,-,-MIL-V-85245 5,l. L3 Packaging. The valve shall be packed in accordance with method I61 of MIL-P-116 and placed in a fgberboard box conforming to W66 or W6c of PPP-B-636. 5Ja 2 Level B. Valves shall be cleaned, preserved and packaged as for Level A, except that the unit container may conform

30、 to paperboard boxes conforming to PPP-B-566 or PPI?-B-676. 5.1.3 Level C. Valves shall be packaged in a manner to prevent deterioration and damage during handling and shipment from the supply source to the first receiving activity for immediate use, 5.2 Packing. Valves packages per 5.1, shall be pa

31、cked level A, B or C as specified (see 6.2) 5*2,1 Level A. Valves shall be packed in wood-cleated plywood boxes conforming to PPP-B-601, Grade A. Gross weight of each box shall not exceed 200 pounds. 5e2.2 Level. B. Valves shall be packed in fiberboard boxes conforming to VS, VS, or V3c of PPP-B-636

32、, 5,2.3 Level C. Valves shall be packed in a manner to assure carrier acceptance and safe delivery to destination. 5,3 Marking. In addition to special requirements of the contract or order, interior packages and exterior shipping containers shall be marked in accordance with MIL-STD-129, and include

33、 the following: M 85245/ (Insert slash number of specification sheet) Month and year of manufacture Class and size 6. NOTES AND CONCLUDING MATERIAL 6.1 Intended use. The valve covered by this specification is intended for use in Type II aircraft and missile hydraulic systems covered by MIL-H-5440 an

34、d operating with hydraulic fluid conforming to MIL-H-5606 or MIL-H-83282 at nominal operating pressures of 3,000 psi. The response of these valves is such that they may be used in place of surge suppression accumulators to limit the maximum applicable system or subsystem operating pressure, 6.2 Info

35、rmation for the contracting officer, Contracts or orders should specify the following: a, Title, number, and date of this specification, 18 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-85245 b. Applicable specification sheet part number, c.

36、Applicable levels of preservation, packaging and packing (see section 5). d. For contractor procurement only, the valve setting pressure as a code number in psi, shall be noted on a temporary tag or equivalent, securely attached to the valve, in order to indicate a specified pressure setting. Relief

37、 valve nameplate and applicable government records such as parts catalogs, spares, documents, etc., shall not contain this coded number indicating pressure setting. The services shall not procure or stock valves adjusted to any specific pressure setting. Notations on airplane contractors assembly an

38、d installation drawings shall contain the proper dash number, as shown in Table I of the applicable specification sheet: followed by the pressure setting parenthetically listed. e. The number of copies of pressure setting instruc- tions required for the using activities. 6.2.1 Procurement requiremen

39、ts. 6.2.2 Contract data requirements. Items of deliverable data required by this specification are cited in the following paragraphs. Paragraph Data Requirement Applicable DID 4.5.4 Report of failure of Sampling Test DI-R-5299A Such data will be delivered as described on approved (numbered) DID S (D

40、ata Item DescriptionlDD Form 1664) when specified on DD Form 1423 (Contract Data Requirements List) and incorporated into the applicable contract. 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

41、, qualified for inclusion in the applicable Qualified Products- List whether or not such products have actually been so Listed by that date. The attention of the contractors is called to this requirement, and manufacturers are urged to arrange to have the products that they propose to off er to the

42、Federal Government tested for qualification, in order that they may be eligible to be awarded contracts or orders for the products covered by this specification. The activity responsible for the Qualified Products Lstis the NavalAir Systems Command, Attn: AIR-530312, Department of the Navy, Washingt

43、on, D.G. 20360; however, information pertaining to qualification of products such as test reports, test fees and test samples may be obtained from the Commanding Officer, Naval Air Development Center, Attn: 30211, Warminster, Pannsy1vani.a 18974. 19 Provided by IHSNot for ResaleNo reproduction or ne

44、tworking permitted without license from IHS-,-,-MIL-V-85245 Custodians: Army - AV Navy - AS Air Force - 11 Preparing Activity: (Project No, 1650-0235) Navy - AS Review: Air Force - 99 4U.S. GOVERNMENT PRINTING OFFICE: 1979-603-02212259 20 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-