1、MIL-V - i9067A(ASG) 30 APRIL 1957 Superseding MIL-V-19067 ( Aer ) 20 August 1955 MILITARY SPECIFICATION VALVES, CHECK, CONTROUABLE, HYDRAULIC, AIRCRAFT, TYPE rr SYSTENS This specification has been approved by the Department of the Air Force and by the Navy Bureau of Aeronautics. 1. SCOPE 1.1 Scope.-
2、 This specification covers hydraulic controllable check valves for use in -1 aircraft hydraulic systems conforming to and as defined in Specification MIGH-SLO. MIGH-877s which covers general requirements common to all aircraft hydraulic components, and this specification which includes additional re
3、quirements specifically applicable to such controllable check valves. with the following standards, as specified (see 6.1): The complete specification for these valves consists of Specification 1.2 Classification.- Controllable check valves shall be furnished in accordance Standard MS28764 Rotary-ch
4、eck valve Standard MS28768 Plunger-type check valve 2.1 The following specifications and standads, of the issue in effect on date of invitation for bids, form a part of this specification to the extent specified herein: SPEGIFIC ATIONS MiUlitary MIL-H-%LiO MIL-H-877s STANDARDS Military Ki28764 MS287
5、68 Hydraulic System: Design, Installation and Tests of Aircraft (General Specification for). Hyraulic System Components Aircraft, General Specification for Valve, Check, Control.iable, Rotary-Action, Hydraulic, 3,000 psi, Type II Systems Valve, Check, Controllable, Plunger- Type, Hydraulic, 3,000 ps
6、i, Type II Systems THIS DOCUMENT CONTAINS /,? PAGES. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-V-LSOb7A 16 = 7777706 0373344 4 m i, I (Copies of specifications, standards, drawings, and publications required by contractors in connection wit
7、h specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) 3. REQUInEMENTS 3.1 General.- The requirements specified in Specification MIL-H-8775 are applicable mirements of this specification. general specification and this specjficatio
8、n conflict, the requirements of this specification shall govern. In the event the requirements of the 3.2 Qualification.- The valves furnished under this specification shall be a product which has been tested and has passed the Qualification tests specified herein. 4. QUALITY ASSURANCE PROVISIONS 4.
9、1 General.- The qualification and acceptance provisions contained in section b of Specification NLH-8775 are applicable to, and form a part of this specification. Additional provisions shall be as specified herein. 4.2 Test conditions.- b.2.1 Positionin Unless otherwise specified, tests may be made
10、with the valve axes in eithedgowing positions: (a) Horizontal (b) Vertical - (The force of gravity acting opposite to the checking act ion. ) 4.3 Qualification tests.- The Qualification tests described herein under nC!ualification test methods“ shall be performed on the applicable specimen by the ma
11、nu- facturer and the activity responsible for qualification, in the order as indicated in tables I and II, respectively. conditions, at the option of the procuring activity. Tests may be supplemented with tests under actual service 4.3.1 Requalification.- Qualification approval based on evaluation o
12、f handmade samples or models other tnan nomal production samples shall be subject to requalification as directed by the procuring activity. responsible for qualification full particulars regarding changes in manufacturing processes, product esign, (including component parts thereof), and of resultin
13、g changes in performance. Results of tests conductedko 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 conformance of the product to requirements of
14、this specification is questionable. The manufacturer snall furnish the activity Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MILV-l9067A( ASG) t: al H 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-
15、,-,-MIL-V-37Ob7A 3b 777770b 0373346 W H H Fil z E-i t km a,%+- eom ka, o+- cal ao 2% it shad5 then be alloxed to check before the static head of fluid. decreases to 1 psi minimm, between the release of the po2Fet. and the cessazion of flUia flow shall be the checklng time and shall not exceed 1-1/2
16、seconds. 4.L.6.2 Cracking pressure.- Gradually increasjng Fressure shall be anplied in the free-flow direction beginfiing with zero Fressure. observed and shall be not less than 2 psi or greater than 8 psi. defined as that pressure at which fluid is bypassed through the valve. Cracking pressure shal
17、l be Cracking pressure is 4.4.7 Pressure drop.- 100F. a flow eqiial to the rated flow capacity. The fluiu flow chal1 be accurately maintained. A manometer connected across the check valve may be used for accurate measurement of the pressure drop. in table IV. or plunger initially set at the closed p
18、osition. This test shali bi perforced at a fluir! tenperature OT Pressure drop in both directions through he check valve shall De measured at The pressure drop through the valve shall not exceed the values specified The test in the free-flow direction shall be made with the valve handle TABLE IV 6.0
19、 -10 10.5 -12 3/4 16.0 25 I I I I 1 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-V-37067A 16 = 7777706 0373350 T h.h.8 Extrene temperature functioning.- 4.1i.8.1 Low temperature functioning.- The valve shall be connected to a static head of
20、 1 to 3 feet of hydraulic fluid in the reverse-flow direction. shall be maintained at a tenperature not wmer then -69F for 4 hours. After this period, the valve poppet shall be actuated mechanically at least10 times. actuation, a Qualification test for leakage (4.4.5) shall be made at -6yF,and the r
21、equire- ments therein shall be satisfied. After this leakage test, the Control force test specified herein under Acceptance (4.6.4), followed by the Operational tests (Cracking pressure and Checking the (4.4.6) shall each be performed at -6s0F, and the reqfiirements therein shall be satisfied. This
22、arrangement After the tenth 4.4.8.2 Rapid warmup.- The low temperature arrangement shall be allowed to warm rapidly to a temperature of 275F. mechanical actuation of the poppet and control movement shall be made at approximately 70F differentials in ambient temperature to determine satisfactory oper
23、ation throiighout the temperature range. of the entire unit to stabilize. Whlle the temperature is being raised, sufficient These check tests shall be made without waiting for the temperature 4.4.8.3 High temperature functioning.- Except where otherwise indicated, the With a head of 1 to 3 following
24、 tests shall b e conducted at a temperature of 275F. feet of hydraulic flui on the valve in the reverse-flow direction, the poppet shall be actuated mechanically at least 10 times. After the tenth actuation, the Qualification test for leakage (b.4.5) shall be conducted, and the requirements therein
25、shall be satisifed. After this leakage test, the Control force test specified herein under Acceptance (4.6*4) followed by Operational tests (Cracking pressure and Checking time (4.4.6) shall be performed, and the requirements therein shall be satisfied. 4.h.9 Endurance cycling.- total of 50,000 cycl
26、es of operation at a rate of 35 2s cpin. With a test setup similar to figure 2, the valve shall be subjected first to 30,000 cycles of automatic checking operation in the manner indicated in 4.4.9.1 and 4.4.9.2. Then with a test setup similar to figure 3, the same valve shall be subjected to 20,000
27、cycles of manual control operation in tho manner indicated in h.h.C.3 and h.4.9.4. cycle shall consist of free flow through the valve at the rated pressure and flow capacity for the size, followed by an impulse in the reverse-flow direction of 1% percent 5 percent of rated pressure. 30,000 cycles of
28、 aiitomatic checking operation shall be between 125 percent and i50 percent. of the rated Fressure. opening and then closing the valve by means of the manual control, with the pressure source delivering rated flow and pressure in the reverse-flow direction. For manual control operation, surge Fressu
29、re durIng the valve-closing portion of each of the 20,000 cycles shall be 150 percent Spercent of the rated pressure. shall be as icdicated in table IV. Controllable check valves shall be subjected to a For automatic checking operation, each Surge pressures in the free-flow direction during al1 F9r
30、manual control operation, each cycle shall consist of first The rated flow capacity Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. NIL-V-19067A Lb W 777770b OI9I35L I AIRLESS r TELT CONTROLLA ELE FIGURE 2. Typical setup for Endurance cycling test,
31、 automatic checking operation 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-19067A Lb m 7777906 OL7L352 3 m PLY? RELIEF VALE RESTRICTSX L FIGURE 3. Typical setup for Endurance cycling teat, manual control operation 10 G Provided by IHSNot f
32、or ResaleNo reproduction or networking permitted without license from IHS-,-,-4.4.9.1 High temperature cycling - automatic checking operation.- The valve shall be subjectea to 7,500 cycles of automatic checking operation at a temperature of 275.F. of 279F for a period of 1 hour with rated pressure a
33、pplied to the valve in the reverse- flou direction. soaked for a period of 1 hour at a temperature of 275F. The temperature shall then be reduced ta a range of 70 to 12OoF,and the Operational tests (Checking time and Cracking pressure (4.M) shall be conducted, and the requirements therein shall be s
34、atisfied. The temperature shall then be lowered to not warmer than -65“F, the Operational tests shall be conducted, and the requirements therein shall be satisfied. Upon completion of these 7,500 cycles, the valve shall be soaked at a temperature The pressure shall then be relieved to approximately
35、zero and the valve 4.4.9.2 Intermediate temperature cycling - automatic checking operation.- The valve shall then be .sub.iected to 22,500 cycles of automatic checking operation at a temperature of 22PF. functioning test (4.4.8.3) shall be conducted at a temperature of 229F, and the require- ments t
36、herein shall be satisfied. The temperature of the test setup shall then be reduced to a range of 70“ to 120F and the fluid temperature stabilized at100“F. cation test for leakage (4.4.5) shall then be conducted,and the requirements therein shall be satisfied. i (4-6.4) Provided by IHSNot for ResaleN
37、o reproduction or networking permitted without license from IHS-,-,-,J / MIL-V-37067A 36 7777706 0373354 7 / I h Operating Force moment in pounds in inch-pounds Part number (-1 (-1 MS28768-4B 7.5 - MS28768-6B 10 - MS28768-8B 200 c MS28768-10B 200 - MILV-19067A (ASG) 4.6 Acceptance test methods.- b.6
38、.1 Examination of product - Acceptance.- Each valve shall be carefully examined to determine conformance with the requirements of this speciffcation, for design, constmction, weight, workmanship, identification of prodct, conformance with applicable drawings, and for any visible defects. The manufac
39、turers drawings and the manufacturers applicable specifications which were submitted when qualification approval was granted, shall be used by the Inspector, as necessary, to determine that the product submitted for acceptance under contract is identical to the item as qualified. 4.6.2 Proof pressur
40、e - Acceptance.- A proof pressure of b,O psi shall be For the reverse- applied in both the free- and reverse-flou directions at least two successive times each direction and held 2 minutes for each pressure application. flow direction, the poppet shall be unseated between applications of the test pr
41、essure. There shall be no measurable external leakage, failure, or permanent set. b.5.3 Leakage - Acceptame.- This test shall be conducted at a fluid temperature of 1132F. listed in table III in the reverse-flow direction for a minimum period of 5 minutes each. The poppet shall be unseated between p
42、ressure applications. leakage measurement period shall consist of the last 3 minutes of the !fiis specification. 6.2 Intended use.- The valves covered by this specification are intended for use in aircraft type II hydrpulic systems conforming to and as defined in Specification MIL-H-o. 6.3 Ordering
43、data.- Procurement documents should specify the MS Part No. of the valve desired. (See 1.2.) 6.4 Provisio.ns for qualification.- With respect to products requiring qualification, awards win be made onl? for such products as have, prior to the bid opening date, been tested and approved for inclusion
44、in the applicable Qualified Products List whether or not such products have actually been so listed by that date. 6.4.1 The attention of suppliers is called to this requirement, and manxfacturers are urged to arrange to have the products that they propose to offer to the Federal Government, tested f
45、or qualification in order that they may be eligible to be awarded contracts or orders for the products covered by this specification. information pertaining to qualification of products covered by this specification should be addressed to the Bureau of Aeronautics, Navy Department, idashington 25$ D
46、. C., the activity responsible for qualification, with a copy to the Commander, Wright Air Develop ment Center, Wright-Patterson Air Force Base, Ohio. Requests for NOTICE: When Government drawings, specifications, or other data are used for any purpose other than in connection with a definitely rela
47、ted Government procurement operation, the United States Government thereby incurs no responsibility nor any obligation whatsoever; and the fact that the Government may have formulated, furnished, or in any way supplied the said drawings, specifications, or other data is not to be regarded by implica
48、tion or otherwise as in any manner licensing the holder or aqy other person or corporation, or conveying any rights or permission to manufacture, use, or sell any patented invention that may in any way be related thereto. Custodians: Navy - Bureau of Aeronautics Air Force Preparing activity: Navy - Bureau of Aeronautics u Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
