1、MIL-V-37067B Lb = 777770b 0373373 O -?Y-/ MIL-V-190698 l 20 January 1986 SUPERSEDING MIL-V-l9069A(ASG) 30 April 1957 MIL I TARY SPEC IF I CATI ON VALVE, CHECK, HYDRAULIC, AIRCRAFT, TYPE II SYSTEMS This specification has been approved for use by all Departments and Agencies of the Department of Defen
2、se. 1. SCOPE 1.1 Scope. This specification covers hydraulic check valves for use in type II aircraft hydraulic systems conforming to specification MIL-H-5440. The complete specification for these check valves consists of specification MIL-H-8775, which covers the general requirements common to all a
3、ircraft hydraulic components, and this specification which includes additional requirements specifically applicable to type II check valves. cation shafl bear the appropriate number code in accordance with the following (see 3.5): 1.2 Part number. Hydraulic check valves furnished under this specifi-
4、 MSXXXXX - 6 SS - T-T LMaterial - “SS“ indicates stainless steel, “AL“ indicates aluminum Size Dash Number - sixteenths of an inch Basic MS Document Number 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards. The following specifications and standards form a part of
5、this specification to the extent specified herein. Unless otherwise specified, the issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation. Beneficial comments (recommen
6、dations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Systems Engineering and Standardization Department (Code 93) , Naval Air Engineering Center, Lakehurst, N;1 08733, by using the self-addressed Standardization Document Improve
7、ment Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC NIA FSC 1650 DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. THIS DOCUMENT CONTAINS A- PAGES* Provided by IHSNot for ResaleNo reproduction or networking permitted without license f
8、rom IHS-,-,-MIL-V-19069B SPEC1 FI CATIONS MI L ITARY MIL-H-5440 MIL-H-8775 Hydraulic Systems, Aircraft, Types I and II, Design and Installation Requirements for Hydraulic System Components, Aircraft and Missiles, General Specification for STAN DARDS MI L I TARY MIL-STD-129 Marking,for Shipment and S
9、torage MS28765 Valve, Check, Hydraulic, Internal Ports, 3000 MS28771 PSI, Type II Systems Valve, Check, Hydraulic, Flared, 3000 PSI, Type II Systems MS28892 Valve, 3000 PSI Hydraulic Check, Flareless, Type II Systems (Copies of specifications and standards required by contractors in connection with
10、specific acquisition functions should be obtained from the contracting activity or as directed by the contracting officer.) 2.2 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein (except for associated detail specifications, specifi
11、cation sheets or MS standards), the text of this specification shall take precedence. shall supersede applicable 1 aws and regulations unless a specific exemption has been obtained. Nothing in this specification, however, 3. REQUIREMENTS 3.1 MS sheets. The individual item requirements shall be as sp
12、ecified herein and in accordance with the applicable MS sheet. conflict between the requirements of this specification and the MS sheet, the latter shall govern. In the event of any 3.2 Qualification. Valves furnished under this specification shall be products which are authorized by the qualifying
13、activity for listing on the applicable qualified products list at the time set for opening of bids (see 4.5 and 6.3). 3.3 Material. The material shall be either stainless steel or aluminum, in accordance with MIL-H-8775 and as specified in the applicable MS sheet. a 4 a e 2 Provided by IHSNot for Re
14、saleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-17067B Lb W 999770b 0373375 LI I l I I I I I I I I I MIL-V-190696 3.4 Design and construction. Valves shall be of the design, construc- tion and physical dimensions specified (see 3.1). specification shall conform to all
15、the requirements of specification MIL-H- 8775 except that in the case of conflict between the requirements of specifi- cation MIL-H-8775 and this specification, the requirements of this specifi- cat i on shall govern. Valves shall be stamped with the military part number (see l.Z), the manufacturers
16、 name or code symbol, and date code. shall be stamped on the body of the valve in accordance with the applicable MS sheet. Valves furnished under this 3.5 Marking. The marking 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase or
17、der, the contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection require- ments specified h
18、erein, unless disapproved by the Government. reserves the right to perform any of the inspections set forth in the specifi- cation where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.1.1 Responsibility for compliance. All items must meet
19、all require- ments of Sections 3 and 5. The inspections set forth in this specification shall become a part of the contractors overall inspection system or quality program. shall not relieve the contractor of the responsibility of assuring that all products or supplies submitted to the Government fo
20、r acceptance comply with all requirements of submission of known defective material, either indicated or actual, nor does it commit the Government to acceptance of defective materi al. The Government The absence of any inspection requirements in the specification 4.2 General. The qualification and q
21、uality conformance provisions con- tained in Section 4 of specification MIL-H-8775 are applicable to, and form a part of, this specification. provisions shall apply. In addition, the following quality assurance 4.3 Inspection conditions. 4.3.1 Positioning. Unless otherwise specified, inspections may
22、 be con- ducted with the valve axes in either of the following positions: a. Horizontal. b. Vertical (the force of gravity acting opposite to the checking action). 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-390698 3b SSSSSOb O393376 b Or
23、der 1 2 3 4 5 6 7 8 9 10 MIL-V-19069B Inspect i on Paragraph Exami nation 4.5.1 Immersion 4.5.2 Proof pressure 4.5.3 Surge flow 4.5.4 Leakage 4.5.5 Operational 4.5.6 Pressure drop 45.7 Extreme temperature 4.5.8 Endurance cycling 4.5.9 Burst pressure 4.5.10 4.4 Qualification inspection. The qualifica
24、tion inspections described herein shall be performed on the sample specimen by the manufacturer and the activity responsible for qualification, in the order specified in tables I and II, respectively. These inspections may be supplemented with inspections performed under actual service conditions at
25、 the option of the procuring act i vi ty. Order TABLE I. Manufacturers preliminary inspection of qualification samples. Inspections required Inspection Paragraph Examination Leakage Proof pressure Extreme temperature 4.5.1 4.5.5 4.5.3 4.5.8 TABLE II. Qualification inspections. Inspections required M
26、aximum clearance specimen Order 1 2 Inspect i on Examination Inspection and comparison of results with those on minimum clearance specimen Paragraph 4.5.1 Minismum clearance specimen Order 1 2 3 4 5 6 7 8 9 10 Inspection Examination I mmer s i on Proof pressure Surge flow Leakage Operational Pressur
27、e drop Extreme temperature Endurance cycling Burst pressure Paragraph 4.5.1 4.5.2 4.5.3 4.5.4 4.5.5 4.5.6 4.5.7 4.5.8 4.5.9 4.5.10 4.4.1 Sample. The sample to be subjected to qualification inspection shall be taken at random from a production run and shall be produced with equipment and procedures n
28、ormally used in production. 4.4.2 Retention of qualification. Qualification approval based on evaluation of handmade samples or models other than normal production samples will be subject to requalification as directed by the procuring activity. manufacturer shall furnish the activity responsi-ble f
29、or qualification full particulars regarding changes in manufacfuring processes, product design Tne 4 l i I 1 I 1 1 I I . w a a Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-37063B 16 797790b 0373377 l MIL-V-19069B (including component parts t
30、hereof) and of resulting changes in performance. Results of tests conducted to prove the acceptability of such changes shall be furnished. Submission of samples for evaluation shall be as directed by the activity responsible for qualification when such changes are made or when con- formance of the p
31、roduct to requirements of this specification is questionable. 4.5 Qu al i fi cat i on i nspect i on. 4.5.1 Inspection of product. The maximum and minimum clearance speci- mens shall each be carefully examined to determine conformance with all the requirements of this specification and for any visibl
32、e defects. The critical clearance dimensions shall be checked and recorded for comparison of results. The dry weight of the assembled valve shall be recorded. 4.5.2 Fluid immersion. All check valves shall be immersed in hydraulic fluid for a continuous period of 72 hours at a fluid temperature of 27
33、5OF, prior to conducting the remainder of the qualification inspections specified herein. All internal parts of the check valve shall be in contact with the fluid during this immersion. After the 72-hour soak period, the check valve shall remain in the fluid at normal room temperature until ready fo
34、r inspec- tion. The interior of the valve shall not be exposed to air for any appreciable length of time during the inspection. 4.5.3 Proof pressure. This inspection shall be performed at a tempera- ture of 275F. A proof pressure of 4500 psi shall be applied in both the free- and reverse-flow direct
35、ions at least two successive times in each direction and held for two minutes for each pressure application. reverse-flow direction, the poppet shall be mechanicaTly unseated between applications of the proof pressure. leakage, failure or permanent set. temperature range of 70“ to 120F. shall be use
36、d, and the precharge pressure for the accumulator shall be stabilized at 1000 psi. The hydraulic test pressure shall be 3000 psi. The directional control valve shall be operated in the following sequence for 25 complete cycles. The following four-point sequence shall total one complete cycle: For th
37、e There shall be no measurable external 4.5.4 Surge flow. This inspection shall be performed within a An inspection setup similar to figure 1 a. The directional control valve handle shall be in a neutral position to permit the buildup of rated hydraulic pressure in the accumulator. b. The directiona
38、l control valve handle shall be quickly actuated to permit flow through the check valve in the free-flow direc- tion. The directional control valve handle shall be permitted to remain in this position until the hydraulic pressure drops to not niore than the specified precharge in the accumulator. 5
39、Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-19069B RELIEF VALVE TEST CHECK VALVE d 1 8 i I al I 4 ALL TUBE ODs SHALL BE AT LEAST ONE SIZE LARGER THAN THE CHECK VALVE TUBE SIZE. TUBE LENGTHS SHALL BE A MINIMUM. HOSE SHALL NOT BE USED. FIGURE
40、 1, Typical setup for surge flow test. ! 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-370b7B 3b 7779906 0393377 3 W MIL-V-190698 t i c. The valve handle shall be returned to the neutral position to permit the buildup of the rated hydraulic
41、 pressure in the accumul ator. d. The directional control valve handle shall be quickly actuated to permit reverse flow to the check valve. shall be allowed to remain in this position for at least three seconds and then moved to the original neutral position. The valve handle 4.5.5 Leakage. This ins
42、pection shall be performed with the valve in the horizontal position. Unless otherwise specified, this inspection shall be conducted at a fluid temperature of 100F. The valve shall be tested for internal leakage by applying the pressure listed in table III for a minimum period of 32 minutes each. Th
43、e pressures shall be applied in the direction of reverse flow and the valve poppet shall be mechanically unseated between pressure applications. minutes in duration and shall begin two minutes after application of the required pressure. The internal leakage shall not exceed the amounts stated in tab
44、le III. There shall be no measurable external leakage during this The leakage measurement period shall be a least 30 inspection. Pressure (Psi 1 5 1 O00 3000 TABLE III. Leak age. Maximum internal leakage (cubic cm for 30 minutes) 1.5 No measurable amount No measurable amount I 4.5.6 Operational insp
45、ection. Operational inspection shall consist of two separate inspections: inspections shall be conducted within a temperature range of 70“ to 120F. When included as part of another inspection, the temperature specified for that inspection shall apply. (1) checking time and (2) checking pressure. The
46、se 4.5.6.1 Checking time. The valve poppet shall be mechanically actuated The time between the release of the poppet and the cessation of to the full-open position against a static fluid head of 5 psi maximum; it should then be allowed to check before thestatic head of fluid decreases to 1 psi minim
47、um. fluid flow shall be the checking time and shall not exceed 1.5 seconds. applied in the free-flow direction beginning with zero pressure. pressure is defined as that pressure at which fluid is bypassed through the 4.5.6.2 Cracking pressure. Gradually increasing pressure shall be Cracking valve, a
48、nd shall be not less than 2 psi or greater than 8 psi. 4.5.7 Pressure dro . This inspection shall be performed at a fluid temperature *e ot 100 F pressure drop through the check valve shall be measured at a flow equal to the rated flow capacity. The fluid flow shal be 7 Provided by IHSNot for Resale
49、No reproduction or networking permitted without license from IHS-,-,-MI L-V-190696 held constant. accurate measurement of the pressure drop. The pressure drop shall not exceed the values specified in table IV. A manometer connected across the check valve may be used for TABLE IV. Maximum pressure drop. Valve size Tube si-ze Rated flow Pressure drop dash no. (in.) capacity, min max (psi) 4 1 /4 . 1.2 10 6 3/8 3.5 10 8 1 /2 6
