1、MIL-R-893LA 9999706 L97L706 637 I INCH-POUND 1 MIL-R-8931A 21 JANUARY 1994 SUPERSEDING MIL-R-8931 30 JUNE 1964 MILITARY SPECIFICATION RESERVOIRS, AIRCRAFT AND MISSILE, HYDRAULIC, SEPARATED TYPE This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SC
2、OPE 1.1 ScoDe. This specification covers the requirements of separated type hydraulic fluid reservoirs where pressure is generated in the fluid by means whereby no fluid surface is in contact with gas. For non-separated type reservoirs, see MIL-R-5520. 1.2 Classification. Hydraulic reservoirs shall
3、be of the following types as specified (see 6.2b): Type A - Fluid pressurized-self-pressurized through a differential area piston Type B - Gas pressurized Type C - Mechanically pressurized I I Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in i
4、mproving this document should be addressed to: Commanding Officer, Naval Air Warfare Center Aircraft Division Lakehurst, Code SR3, Lakehurst, NJ 08733-5100, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AM
5、SC NIA FSC 1650 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-8931A 9799906 1971707 573 m MIL-R-8931A 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 SD
6、ecifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and
7、 Standards (DoDISS) and supplement thereto, cited in the solicitation (see 6.2d). SPECIFICATIONS FEDERAL PPP-8-585 - Boxes, Wood Wirebound PPP-B-591 - Boxes, Shipping, Fiberboard, Wood-Cl eated PPP-B-601 - Boxes, Wood, Cleated-Plywood PPP-B-621 - Boxes, Wood, Nai 1 ed, and Lock-Corner PPP-B-636 - Bo
8、xes, Shipping, Fiberboard MILITARY MIL-C-104 - Crates, Wood, Lumber and Plywood, Sheathed Nailed, and Bolted MIL-P-116 - Preservation, Methods of MIL-H-5440 - Hydraulic Systems, Aircraft, Types I and II, Design and Installation Requirements For MIL-H-5606 - Hydraulic Fluid, Petroleum Base, Aircraft,
9、 Missile and Ordnance MIL-H-8775 - Hydraulic System Components, Aircraft and Missiles, General Specification For MIL-V-8813 - Val ves, Aircraft, Hydraul ic Pressure Relief, Type II Systems. MIL-H-8891 - Hydraul i c Systems, Manned F1 i ght Vehicles, Type III, Design, Installation and Data Requiremen
10、ts, General Specification For 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-8931A 999990b 1971708 40T MIL-R-8931A MIL-L-10547 MIL-H-25475 MIL-H-83282 STANDARDS MILITARY MIL-STD-100 MIL-STD-129 MIL-STD-130 MIL-STD-280 MIL-STD-810 MIL-STD-889
11、 MIL-STO-1523 MS33649 Liners, Case, and Sheet, Overwrap, Water Vaporproof or Waterproof, F1 exi bl e Hydraulic Systems, Missile, Design, Installation, Tests and Data Requirements, General Requirements For Hydraulic Fluid, Fire Resistant, Synthetic Hydrocarbon Base, Aircraft Engineering Drawing Pract
12、ices Marking For Shipment And Storage Identification And Marking Of U.S. Mi 1 i tary Property Definitions of Item Levels, Item Exchangeabi 1 i ty, Model S, And Re1 ated Terms Environmental Test Methods And Engineering Guide Lines Dissimilar Metals Age Control Of Age - Sensitive El astomeri c Materi
13、al Bosses, Fluid Connection - Internal Straight Thread (Unless otherwise indicated, copies of federal and military specifications, standards, and handbooks are avai 1 ab1 e from DoDSSP-Customer Service, Standardization Documents Order Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-509
14、4.) NAVY DEPARTMENT SPECIFICATION SD8706 - Data and Test, Engineering Contract Requirements For Aircraft Weapon Systems 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-8931A m 7999906 1971709 34b m . MIL-R-8931A (Copies of documents are avail
15、able from the Navy Aviation Supp 03443, Tabor Avenue, Philadelphia, PA 19120-5099.) ly Off ice, Code e 2.2 Non-Government Dublications. The following document forms a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DoD adopted a
16、re those listed in the issue of the DoDISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DoDISS are the issues of the documents cited in the solicitation (see 6.2d). AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM D3951 - Packaging, Commercia
17、l (Application of copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103-1187) SOCIETY OF AUTOMOTIVE ENGINEERS (SAE) AS 1933 - Age Controls For Hose Containing Sensitive Elastomeric Materials i ve (Application of copies should be addres
18、sed to the Society Of Automot Engineers, Inc., 400 Commonwealth Drive, Warrendale, PA 15096.) (Non-Government standards and other publications are normally available from the organizations that prepare or distribute the documents. These documents also may be available in or through libraries or othe
19、r informational services.) 2.3 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein (except for related associated detail specifications, specification sheets or MS standards), the text of this document shall take precedence. Nothing
20、in this document, however, supersedes appl icabl e 1 aws and regul ations un1 ess a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6.4), a sample shall be subjected to first article inspection (see 4.3). 3.2 Selection of sDecifications and standards. Spe
21、cifications and standards for necessary commodities and services not specified herein shall be selected with the approval of the contracting activity. 3.3 Materials. Materials shall conform to referenced specifications and shall be as specified herein and on MS standards or specification sheets. Mat
22、erials which are not covered by the military specifications or which are not specifically described herein, shall be of the lightest weight and shall be compatible with hydraulic fluid. Materials that produce toxic or corrosive substances shall not be used. 4 Provided by IHSNot for ResaleNo reproduc
23、tion or networking permitted without license from IHS-,-,-NIL-R-893LA m 9999906 L97L7LO 068 MIL-R-8931A 3.3.1 Metal Darts. All metal parts shall be of a corrosion resistant corrosion, dissimilar metals shall not be used in intimate contact with each material or treated in a manner to render them res
24、istant to corrosion. 3.3.1.1 Dissimilar metals. Unless protected against electrolytic other. Dissimilar metals are defined in MIL-STD-889. 3.3.2 Protective treatment. When materials are used in the construction of the reservoirs that are subject to deterioration when exposed to environmental conditi
25、ons likely to occur during service usage, they shall be protected against such deterioration in a manner that shall in no way prevent compliance with the performance requirements of this specification (see 3.5). Protective coatings which shall crack, chip, or scale during normal service life or unde
26、r extreme environmental conditions shall not be used. 3.4 Desiqn and construction. Hydraulic reservoirs furnished under this specification for aircraft use shall be in accordance with the requirements of this specification and the requirements of MIL-H-5440 for type I system temperature range from -
27、65OF to t16OoF (-54OC to t71OC) and type II system temperature range from -65OF to t275OF (-54OC to t135OC). For type III system, the requirements shall be in accordance with MIL-H-8891 temperature range from -65OF to t45OoF (-54OC to t232OC) as applicable. Hydraulic reservoirs furnished under this
28、specification for missile use shall be in accordance with the requirements of MIL-H-25475. 3.4.1 Reservoir caDacity. Hydraulic reservoirs shall be designed to provide a minimum total available capacity equal to the sum of the following requirements, as applicable (see figure 1): a. A sufficient amou
29、nt of fluid to ensure that the hydraulic pump inlet pressurization and satisfactory circulation are maintained with the position of the separator corresponding to that fluid quant i ty . b. A fluid volume equivalent to 100 percent of the possible net depletion caused by actuator volumetric changes w
30、hich can occur in any ground operation or flight condition of a recirculating hydraul ic system (see 6.5.1). Reference shall be from the normal reservoir filling attitude and position of the various hydraulic subsystems. c. A fluid volume equivalent to 100 percent of the reservoir fluid volumetric c
31、hange caused by charging all accumulators to system operating pressure from a completely discharged position, with no gas precharge in the largest single accumulator, and a minimum design gas precharge in all others in the system. d. A fluid volume equivalent to 130 percent of the volumetric capacit
32、y of the 1 argest quantity measuring type of hydraul ic fuse in the system. e. A fluid volume equivalent to the maximum thermal contraction which is expected to occur when the entire fluid content of a 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-
33、,-MIL-R-8931A m 9799906 1971711 TT4 m MIL-R-8931A recirculating system is exposed to a temperature decrease from 7OoF down to -4OOF (21OC to -4OOC). f. A fluid volume equivalent to not less than 5 percent of the entire system fluid volume, including the reservoir of a recirculating system in order t
34、o minimize the frequency of refilling. The differential volume between “full“ and “refill“ shall correspond to this leakage allowance. g. A fluid volume equivalent to that resulting from the effects of fluid compression, 1 ine expansion, actuator expansion, and external seal deflection when the hydr
35、aulic system which the reservoir is serving is pressurized to normal operating pressures. h. A fluid volume equivalent to system fluid thermal expansion, resulting from a temperature increase from 7OoF (21OC) to maximum operating temperature. 3.4.1.1 Emersencv reserve capacitv. In those cases where
36、an emergency reserve capacity of fluid is required, the minimum volume shall be equal to 125 percent of the fluid required for the emergency purposes. The volumetric capacity of those subsystems which can be operated other than hydraulic fluid shall not be considered, provided that no fluid is drawn
37、 from the reservoir during such operation. No allowances for return of fluid to the reservoir shall be made in determining emergency reserve capacity. The emergency reserve capacity shall be provided in a separate reservoir. 3.4.2 Fillinq and refill. The reservoir design shall be such that initial f
38、illing of the reservoir installed in vehicle, and any subsequent refilling or replenishment of the fluid, shall be accomplished only through the use of an external force device such as a hand pump or power pump. Unless otherwise specified in the contract such provision shall not be incorporated in t
39、he design of the reservoir. However, no provision shall be incorporated which permits the transfer of hydraulic fluid into the reservoir by gravity flow from an external container. The reservoir filling ports shall be so designed and installed at locations where it shall prevent the above procedure.
40、 3.4.2.1 Fluid level indication. Indicators shall be incorporated in the reservoir design to automatically provide a continuous visual indication of reservoir fluid level. Temperature compensation for accurate fluid indication shall be included in the design. The fluid temperature compensation range
41、 shall be in accordance with the applicable type I, type II, and type III hydraulic systems. The indication shall be implemented either by alternate indication on a readout or by temperature sensing elements in the gaging mechanism. The use of a dip stick, or the necessity for the manipulation or mo
42、vement of any of the component parts in order to obtain the reading shall not be acceptable. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. MIL-R-893LA m 9999906 L9717L2 930 MIL-R-8931A EXAMPLE OF VOLUMETRIC CHANGE IN AN ACTUATING f CYLINDER AFT
43、ER ACING THROUGH THE HALF -CYCLE TO.THE RESERVOIR. EXCHANGE VOLUME EQUALS VOLUME OF OPERATION WHICH RETURNS THE MOST FLUID OF 1HAT PART OF PISlON ROD INDICATED BY SHADING. INDICATOR NAME PLATE ONLY (FLUID LEVEL MARKINGS) REQUIRED ON NAME PLATE - 7 CXTREME OVERFULL my-?. L“ I I “ FULL SYrlEM DEPRESSU
44、RlZED BLEEDER PORT TYPE B RESERVOIR SHOWN SCHEMATICALLY IN EXTPEME OVERFULL CONDITION vent or pressure port - l/-Fxr 34.1 10) - MllllMllM PEEMISSIBLE OPERATING LEVEL !ALL DESIGN CONDITIONS ADVERSE FIGURE 1. Reservoir caoacitv reouirements. 7 Provided by IHSNot for ResaleNo reproduction or networking
45、 permitted without license from IHS-,-,-MIL-R-8931A 9999906 L971713 877 m MIL-R-8931A NOTE to figure 1: I/ Per 3.4.1 (a), some or al 1 of this vol ume may be i ncl uded in the end cavity containing residual oil as pictured depending upon the particular design situation. 2/ Actual service minimum ope
46、rating level might be above this level depending upon the most adverse combination of actuation position avai 1 ab1 e. s/ Accumulator oil pressure shall be stated on this name plate if any accumulations are not automatically and rapidly depressurized when hydraulic pumps are stopped. The indicating
47、device shall have a fail-safe characteristic, so that failure of the indicating arrangement shall not malfunction the operation of the reservoir. 3.4.3 Draininq. The reservoir shall contain provision for draining hydraulic fluid completely from the reservoir when the vehicle is at rest, without the
48、necessity of disconnecting any tubing connections. 3.4.4 Bleedinq. Reservoir design and installation shall be such that if entrained gas bubbJes in the hydraulic fluid allowed to accumulate in any space in the reservoir, means shall be provided for removing entrapped air in a bleeding operation with
49、out any tubing disconnections. Also, provisions shall be manual removal of any hydraulic fluid from any cavities in the reservoir in which fluid is not present by design, such as the gas side of a gas-pressurized piston type reservoir. . provided in any recirculating system reservoir for either automatic or periodic 3.4.5 Structural strenqth. Reservoirs shall have ample strength and rigidity to withstand 250 percent of the maximum wrench torques
