1、MIL-F-29724 43 = 7779706 04137Lb 7 = 15 February 1990 MILITARY SPECIFICATION FILTER HOUSINGS (HYDRAULIC) AND DIFFERENTIAL PRESSURE INDICATORS, GENERAL SPECIFICATION FOR This specification is approved for use by the Naval Sea Systems Command, Department of the Navy, and is available for use by all De
2、partments and Agencies of the Department of Defence. 1. SCOPE 1.1 Scope. This specification covers hydraulic filter housings with differential pressure actuated bypass valves and connected indicators for use in ship hydraulic systems with an operating pressure up to 3,000 pounds per square inch (lb/
3、in2) as specified in the applicable specification sheets (see 3.1). 1.2 Classification. Filter housings shall be of the envelope sizes specified in applicable specification sheets (see 3.1). The standard part numbers for the filter housings shall be as specified in the applicable specification sheet
4、s (see 3.1). 2. APPLICABLE DOCUMENTS 2.1 Government document 2.1.1 SDecifications. standards. and handbooks. The following speci- fications, standards, and handbooks form a part of this document to the extent specified-herein. Unless otherwise specified, the issues of these documents are those liste
5、din the issue of the Department of Defense Index of Specification and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed
6、to: Commander, Naval Sea Systems Command, SEA 5523, Department of the Navy, Washington, DC 20362-5101 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 4330 DISTRIBUTION STATEMENT A. Approved or p
7、ublic release; distribution is unlimited. Licensed by Information Handling ServicesMIL-F-24724 L13 m 7779706 OL1L37L7 O m SPECIFICATIONS FEDERAL PPP-F-320 - Fiberboard: Corru (Container Grade ated and Solid, Sheet Stock and Cut Shapes. MILITARY MIL-S-901 - Shock Tests, H.I. MIL-C-5501 MIL-H-6083 . M
8、IL-H-17672 MIL-E-19140 MIL-F-24702 MIL-F-24702/1 MIL-F-24724/1 MIL-F-24724/2 (High-Impact) Shipboard Machinery, Equipment, and Systems, Requirements for. Seal, General Specification for. and Operation. - Caps and Plugs, Protective, Dust and Moisture - Hydraulic Fluid, Petroleum Base, for Preservatio
9、n - Hydraulic Fluid, Petroleum, Inhibited. - Lumber and Plywood, Fire-Retardant Treated. - Filter Elements, Hydraulic, Disposable, General - Filter Elements, Hydraulic, Disposable. - Filter Housings (Hydraulic) and Differential - Filter Housings (Hydraulic) and Differential Specification for (Metric
10、) Pressure Indicators (1, 2, 3 Elements). Pressure Indicators (4 and 6 Elements). STANDARDS MILITARY MIL-STD-278 - Welding and Casting Standard. MIL-STD-1186 - Cushioning, Anchoring, Bracing, Blocking and MIL-STD-2073-1 - DOD Materiel Procedures for Development and MIL-STD-2193 - Hydraulic System Co
11、mponents, Ship. (Metric) Waterproofing; with Appropriate Test Methods. Application of Packaging Requirements. (Unless otherwise indicated, copies of federal and military specifications, standards, and handbooks are available from the Naval Publications and Forms Center, (ATTN: NPODS), 5801 Tabor Ave
12、nue, Philadelphia, PA 19120-5099.) 2.2 Non-Government publications. The following document(s) form a part of this document to the extent specified herein. issues of the documents which are DOD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless Otherwise specified,
13、the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). Unless otherwise specified, the 2 Licensed by Information Handling ServicesMIL-F-2472q 43 7779706 04L37L 2 1 AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) Y14.5 - Dimensioning and Tol
14、erancing. (DOD adopted) Y32.10 - Graphic Symbols for Fluid Power. Diagrams, (DOD adopted) (Application for copies should be addressed to the American National Standards Institute, 1430 Broadway, New York, NY 10018.) AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) D 3951 - Standard Practice for Com
15、mercial Packaging. (DOD adopted) (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) NATIONAL FLUID POWER ASSOCIATION (NFP(A) T2.6.1 - Method for Verifying the Fatigue and Static Pressure- Ratings of the Pressure C
16、ontaining Envelope of a Metal Fluid Power Component. (Application for copies should be addressed to the National Fluid Power Association, 3333 N. Mayfair Road, Milwaukee, WI 53222.) SOCIETY OF AUTOMOTIVE ENGINEERS (SAE) J 1926 - Specification for Straight Thread O-Ring Boss Port. (Application far co
17、pies should be addressed to the Society of Automotive Engineers, 400 Commonwealth Drive, Warrendale, PA 15096.) (Non-Government standards and other publications are normally available These fromathe organizations that prepare or that distribute the documents. documents also may be available in or th
18、rough libraries or other informational services. ) 2.3 Order of precedence. in the event of a conflict between the text of this document and the references cited herein (except for related specification sheets), the text of this document takes precedence. Nothing in this document, however, supersede
19、s applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 SDecification sheets. The individual item requirements shall be as specified herein and in accordance with the applicable specif-ication sheet. the event of any conflict between the requirements of t
20、his specification and the specification sheet, the latter shall govern. In 3 Licensed by Information Handling Services-_- - MIL-F-24724 43 = 777770b 0433737 4 3.2 Qualification. The filter housings furnished under this specification shall be products which are authorized by the qualifying activity f
21、or listing on the applicable qualified producks list at the time of award of contract (see 4.3 and 6.3). 3.3 Materials. Materials shall be in accordance with MIL-STD-2193. Where threaded connections are used between the filter bowl and housing, the thread design and materials shall be selected to pr
22、event galling. The bowl and head shall be either constructed of dissimilar materials which do not gall when in contact, or of similar materials which have a hardness difference of at least 45 Brinell points. not be permitted. Plating or coating threads to achieve hardness difference shall 3.3.1 Reco
23、vered materials, Unless otherwise specified herein, all equip- ment, material, and articles incorporated in the products covered by this specification shall be new and may be fabricated using materials produced from recovered materials to the maximum extent practicable without jeopardizing the inten
24、ded use. The term “recovered materials“ means materials which have been collected or recovered from solid waste and reprocessed to become a source of raw materials, as opposed to virgin raw materials. interpreted to mean that the use of used OK rebuilt products is allowed under this specification un
25、less otherwise specifically specified. None of the above shall be 3.3.2 Comoatibilitv. The filter housing components shall be compatible with the fluids identified in the compatibility requirements specified in MIL-STD-2193. 3.4 Desim and construction, Unless otherwise specified herein, the design,
26、parts and construction of filter housings shall be in accordance with the construction requirements specified herein, MIL-STD-2193, and in the applicable specification sheets (see 3.1). 3.41 Filter housings. With the filter element installed, the oil flow through the housing shall be “outside-in“. T
27、he fluid entering the housing shall not impinge directly upon the element filter medium. The housings shall be of a construction that allows the filter elements to be removed for service and examination without disconnecting fittings or disturbing the mounting. filter elements cannot be improperly i
28、nstalled. designed for the flowrates specified in the applicable specification sheets (see 3.1). These flowrates are based on the use of fluid in accordance with MIL-L-17672. When fluids of lower viscosities are used, the filter assemblies will be suitable for higher flowrates. Filter housings shall
29、 be of the full-flow type. The construction shall be such that the The filter housings shall be 3.4.2 Structural strength. Filter housings shall withstand all the structural loads imposed by the functional test requirements of this specifica- tion. rigidity as to withstand the torque loads required
30、for making tube and pipe connections and replacing filter elements. In addition, the filter housing and mountings shall be of such strength and 4 Licensed by Information Handling ServicesMIL-F-24724 43 777770b 0413720 O I 3.4.3 Porting block. be a differential pressure indicator and bypass valve. by
31、pass valve shall permit repair or replacement without replacing the porting block or housing. Integral to the porting block of the filter assembly shall The indicator and D 3.4.4 Seals. Seals and seal glands shall be in accordance with MIL-STD-2193. 3.4.5 Fasteners. Screws, bolts and threaded insert
32、s shall be in accordance with MIL-STD-2193. 3.4.6 Dimensions. The filter housing dimensions shall be as specified (see 3.1). 3.4.7 Protective devices. 3.4.7.1 BvDass-relief valve. The filter housings shall incorporate a relief valve to automatically bypass hydraulic fluid in the event of excessive f
33、low restriction through the filter elements. The cracking, reseat, and full flow differential pressure across the relief valve shall conform to the values ispecified (see 3.1 and 6.2). 3.4.7.2 Differential Dressure indicators. Each filter housing porting block shall incorporate an integral different
34、ial pressure indicator (see 3.4.3 and 6.2). The indicator shall show, by mechanical or electrical means (see 3-4.7.2.1 and 3.4.7,2.2), the position of the filter bypass valve, inadvertently activate under vibration of a 20 gravity shock load. In the absence of flow through the filter, the indicators
35、 shall reset automatically and shall be manually checked for visual pointer rotation over all settings on a tricolor scale (see 3.4.7.2.1). The indicator shall not 3.4.7.2.1 Mechanical indicators. Mechanical pressure indicators (style M) shall actuate, by raising or moving an indicator, at a filter
36、element differential pressure value specified (see 3.1). a visual indication of the bypass valve position concurrent with the filter element condition on a tricolor scale, the “closed“ position of the bypass and “clean“ condition of the filter element; a yellow area shall represent the “closed“ posi
37、tion of the bypass valve and “becoming contaminated“ condition of the filter element; a red area of the scale shall represent the “cracked to fully open“ position of the bypass valve and “cloggedtt condition of the filter element. and corresponding indicator pointer position shall represent 80 perce
38、nt of the cracking pressure setting. indicator pointer position shall represent 98 percent of the minimum cracking pressure setting specified (see 3.1). Unless otherwise specified (see 3.1), these settings shall have a tolerance of plus or minus 3 lb/in2. Mechanical pressure indicators shall provide
39、 A green area of the scale shall represent The junction of green and yellow area The junction o yellow and red area and corresponding 3.4.7.2.2 Electrical indicators. Electrical pressure indicators (style E) shall raise or move an indicator, at a filter element differential pressure value specified
40、(see 3.1). The indicator shall provide an electrical and visual indication of the bypass valve position concurrent with the filter element condition. The visual indication shall be on a tricolor scale as described in 5 Licensed by Information Handling Services3.4.7.2.1. The electrical indication sha
41、ll be either alarm or light signal. In an operating system, the signal shall be continuously activated when the bypass valve is in the open position. terminals in the switch housing, Electrical rating on a single-pole, double-thro1 switch shall be 5 amperes at 110 volts alternating current (Vac), 28
42、 volts direct current (Vdc) (resistive); and 3 amperes at 100 Vac, 28 Vdc (inductive). The electric switch shall be enclosed with 3.4.7.3 Bleed valve. to vent pressure and air before and after element change. size shall be 0.438-20UNF. Filter housings shall be equipped with a bleed valve The bleed p
43、lug thread 3.4.8 Drain luq. Filter housings shall be equipped with a drain plug. The positioning of the plug shall permit maximum drainage of oil from the housing. 3.4.9 Mounting. The configuration shall include provisions for solid mounting of the filter housings. shock requirements (see 3.5.2). Th
44、e mounting provisions shall meet the specified 3.4.9.1 Element removal clearance. The filter element shall be removable, without damage, from the filter assembly that has an element removal clearance equal to or less than the value specified (see 3.1). 3.4.10 Welding and allied mocesses, Welding and
45、 allied processes shall be in accordance with MIL-STD-278 for the housing pressure vessel or structural weld, as applicable. 3.5 Performance, Filter housings, bypass relief valves, and differential pressure indicators shall perform as specified when subjected to the examination and tests specified (
46、see 4.3 and 4.4). 3.5.1 Proof messure. 1-1/2 times the operating pressure without evidence of permanent deformation, malfunction, or external leakage. Filter housings shall withstand a proof pressure of 3.5.2 Shock. Filter housings, bypass relief valves, and differential pressure indicators shall me
47、et the shock requirements of MIL-S-901 for grade A, class 1 equipment. 3.5.3 Housina pressure droD. The pressure drop through the filter housing at maximum rated flow, with dummy element installed, shall not exceed the value specified (see 3,1), 3.5.4 Fatierue imDulse. Filter housings, bypass relief
48、 valves, and differential pressure indicators shall withstand, without failure, 10 million impulse pressure cycles in accordance with NFP(A) T2.6.1. 3.6 Interchangeabilitv. Parts having the same specification part number shall be interchangeable and shall conform to the dimensional requirements spec
49、ified for these parts. be functionally and dimensionally interchangeable, Parts having the same manufacturers part number shall 6 Licensed by Information Handling Services1 MIL-F-2472443 W 9797706 0413722 W 3.7 Identification. 3.7.1 Markinq. Each filter housing shall be clearly and permanently identified by an attached identification plate containing the following information (except for the ANSI fluid symbol, which may be put on a separate plate alone): - (a) Number and date of this specification. (b) Filter housing specification part number (see 3.1). (c) Manufacturers part
