1、 _ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising ther
2、efrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2017 SAE International All rights reserved. No part of this
3、publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-49
4、70 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/standards.sae.org/AS4157B AEROSPACE STANDARD AS4157 REV. B Issued 1988-05 Reaffirmed 2015-06 Revised 2017-09 Sup
5、erseding AS4157A Coupling Assemblies, Hydraulic, Self-Sealing, Quick Disconnect 8000 Pounds Per Square Inch, Gage RATIONALE Removed all references to 5000 psig pressure class. 1. SCOPE This specification covers the requirements for aircraft hydraulic, self-sealing, quick disconnect couplings for use
6、 in 8000 lbf/in2 (gage) lightweight hydraulic systems. 1.1 Classification Hydraulic self-sealing, quick disconnect couplings shall be of the following class and type: a. Class 8000 - 8000 lbf/in2 (gage) Operating Pressure NOTE: See AS1709 for other pressure classes. 2. REFERENCES 2.1 Applicable Docu
7、ments The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other publications shall be the issue in effect on the date of the purchase order. In the event of conflict between the text of this
8、 document and references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 2.1.1 SAE Publications Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001
9、, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. ARP24 Determination of Hydraulic Pressure Drop ARP868 Method-Pressure Drop Tests for Fuel System Components AIR1047 A Guide for the Selection of Quick-Disconnect Couplings for Aerospace Fluid Systems SAE INTER
10、NATIONAL AS4157B Page 2 of 17 AS603 Impulse Testing of Hydraulic Hose, Tubing, and Fitting Assemblies AS1709 Coupling Assembly, Hydraulic Self Sealing, Quick Disconnect AS8775 Hydraulic System Components, Aircraft and Missiles, General Specification For AS85720 Fittings, Tube, Fluid Systems, Separab
11、le, High Pressure Dynamic Beam Seal, 5000/8000 psi, General Specification For 2.1.2 U.S. Military Specifications and Standards Copies of these documents are available online at http:/quicksearch.dla.mil. MIL-PRF-83282 Hydraulic Fluid, Fire Resistant Synthetic Hydrocarbon Base, Aircraft MIL-H-85800 H
12、ose Assemblies, Polytetrafluoroethylene, Fiber Reinforced, 5000 and 8000 lbf/in2, General Specification For MIL-STD-129 Marking for Shipment and Storage MIL-STD-130 Identification Markings of US Military Property MIL-STD-810 Environmental Test Methods 3. REQUIREMENTS 3.1 Qualification The couplings
13、furnished under this document shall be products which have been tested, and have passed the qualification tests specified herein, and have been approved by the procuring agency or prime contractor. 3.2 General Specification The document established by the procuring agency shall be in addition to the
14、 requirements specified herein. 3.3 Materials The couplings shall be constructed of materials that shall not change the composition of or be adversely affected by hydraulic fluid conforming to MIL-H-83282. Other materials and fluids can be utilized for similar applications based on procuring agency
15、requirements. 3.4 Design and Construction The configuration, dimensions, and other details of design of the couplings shall conform to applicable specification control drawing, Table 5, or as specified by the procuring agency. The design objective shall be to obtain the smallest size and lightest we
16、ight commensurate with meeting performance requirements herein. When coupled, the coupling shall be such that it shall permit fluid flow in either direction in accordance with the rated flow and pressure drop as specified in Table 1. Flow shall not be blocked under surge conditions. Quick disconnect
17、 shall have both a visual and touch indication that they are connected and open to flow. The overall dimensions shall not exceed that shown in Table 5. Unless otherwise specified by the procuring agency, the end fitting size configuration shall be per MIL-F-85720. SAE INTERNATIONAL AS4157B Page 3 of
18、 17 Table 1 - Rated flow and pressure drop class 8000 Dash No. Class 8000 Equivalent Tube Size in Inches Class 8000 Rated Flow gal/min Maximum Pressure Drop lbf/in2 Rated Flow Surge Flow gal/min -03 3/16 2.5 25 12.5 -05 5/16 5.7 25 28.5 -07 7/16 10.0 25 50.0 -09 9/16 16.3 25 81.5 -11 11/16 26.0 25 1
19、30.0 -15 15/16 47.0 25 234.0 If a secondary sealing function for the disconnected half is required, a pressure cap or plug shall be provided as an optional design feature. The requirement shall be specified by the procuring agency. 3.4.1 Temperature Range Couplings shall be designed to operate throu
20、ghout the temperature range listed in 4.6.3. 3.4.2 Sealing and Fluid Loss The couplings shall, when uncoupled, seal the ends of the disconnected lines at the point of disconnection and shall not permit external leakage during any phase of coupling or uncoupling. Fluid loss (spillage) as specified in
21、 Table 2 is not considered to be external leakage. Both halves of the coupling shall seal fluid under both low and high pressures (see 4.6.4). Table 2 - Air Inclusion and Fluid Loss Dash No. Class 8000 Equivalent OD Tube Size in Inches Class 8000 Air Inclusion Standard Cubic Centimeters Maximum Aver
22、age Fluid Loss (Spillage)/Operating Cycle, Cubic Centimeter Maximum -03 3/16 0.10 0.05 -05 5/16 0.20 0.10 -07 7/16 0.40 0.20 -09 9/16 0.60 0.30 -11 11/16 1.00 0.50 -15 15/16 1.75 1.00 SAE INTERNATIONAL AS4157B Page 4 of 17 3.4.3 Seals The selection of packing and retainer materials shall be compatib
23、le with MIL-H-83282 fluid. For other fluids, packing and retainer material shall be specified by the procuring agency, and the material compatibility tests shall be conducted by the supplier to demonstrate the satisfactory performance of the coupling. 3.4.3.1 Glands Glands shall be per MIL-G-5514, e
24、xcept that the radial clearance shall be reduced as required to prevent extrusion. 3.4.4 Functional Operation The coupling design shall be such that, even when wearing an arctic glove, the couplings connect and disconnect operation can be performed with one hand. A static pressure shall be applied t
25、o both halves and each one-half of the coupling respectively (that is, when one-half of the coupling is pressurized and the other half is unpressurized) (see 4.6.10.1). The static pressure applied shall be per Table 3 to permit one-hand operation (see 4.6.10). Table 3 - Coupling forces with the indi
26、cated static pressure applied to both halves Dash No. Class 8000 Static Pressure lbf/in2 (gage) Push-Pull Axial lb Torque Rotation in lb -03 100 50 15 -05 100 50 20 -07 100 50 25 -09 100 50 30 -11 100 50 40 -15 100 50 50 3.5 Interchangeability It shall be impossible to interconnect different tube si
27、zes and couplings of different pressure classes shall not be capable of cross-coupling. Coupling halves of the same part number shall be interchangeable and cross-couple all referenced mating halves. 3.6 Performance The self-sealing couplings furnished under this document shall perform satisfactoril
28、y when conforming to the following performance requirements: 3.6.1 Envelope, Weight, Materials Each coupling half must conform to the applicable purchaser and supplier envelope dimensions, weight control, materials, and finishes. 3.6.2 Proof Pressure The connected coupling and each coupling half mus
29、t meet operational and leakage requirements after being subjected to proof pressure of 150% of operating pressure (see 4.6.2). SAE INTERNATIONAL AS4157B Page 5 of 17 3.6.3 Extreme Temperature Functioning The connected coupling and each coupling half shall show no malfunction during or after being su
30、bjected to extreme temperature testing using the values stated in 4.6.3. 3.6.4 Leakage Coupling halves shall meet specified leakage requirements of 4.6.4 at 30 inches static head of hydraulic fluid and at the operating pressure specified in 1.1. 3.6.5 Vacuum The connected and disconnected coupling s
31、hall meet inward leakage requirements with no evidence of malfunction or degradation, with equivalent of 10 inches Hg applied and lines closed for 5 minutes (see 4.6.5). 3.6.6 Surge Flow The connected and disconnected coupling shall meet leakage, operational, and pressure drop requirements after bei
32、ng subjected to the surge flow tests, as defined in Table 1. 3.6.7 Vibration Unless otherwise specified, the connected and disconnected coupling must be capable of withstanding the vibration environment specified herein without experiencing any malfunction or degradation. Couplings shall be pressuri
33、zed with 15 lbf/in2 (gage) pressure (see 4.6.7). The test setup shall be as shown in Figure 1. 3.6.8 Impulse The connected coupling and disconnected coupling halves with pressure cap and plug, if required, shall be capable of withstanding the impulse testing specified per ARP603 without any indicati
34、on of malfunction. Pressures, rate of rise, and impulse form shall be per Table 6 and Figure 3 (see 4.6.8). 3.6.9 Endurance Each coupling half shall be capable of withstanding 1000 endurance cycles of coupling/uncoupling without any evidence of malfunction or degradation, with the pressures specifie
35、d in Table 3 applied to both halves (see 4.6.9). 3.6.10 Manual Operation The coupling shall be capable of being tested in accordance with specified requirements of 4.6.10 with no evidence of coupling forces, leakage, or spillage beyond the specified limits. The coupling force/torque and applied pres
36、sures shall be per Table 3 (see 4.6.10). NOTE: Both coupling halves shall be installed in systems capable of accommodating some fluid displacement without pressure rise. 3.6.11 Air Inclusion The air inclusion for all couplings shall be within specified limits per Table 2 and at 30 inches of fluid pr
37、essure (see 4.6.11). 3.6.12 Impact Unless otherwise specified by the Procuring Agency, connected couplings and coupling halves (disconnected coupling halves with caps and plugs, if required) shall withstand a 20 g impact test without evidence of disconnection. Evidence of leakage or malfunction afte
38、r the test is not permitted (see 4.6.12). SAE INTERNATIONAL AS4157B Page 6 of 17 3.6.13 Pressure Drop Each coupling shall indicate a pressure drop within the limits specified in Table 1. The fluid temperature shall be 100 F 10 F and test setup shall be as shown in Figure 4 (see 4.6.13). NOTE: The en
39、d shall be fixed to allow equivalent length and bend radius shown on Table 4 by clamping either the end fitting or the hose as required. Figure 1 - Setup for impulse and vibration test SAE INTERNATIONAL AS4157B Page 7 of 17 Table 4 - Hose length and bend radii Dash No. Class 8000 Equivalent OD Tube
40、Size Class 8000 Hose Length (in.) Flexible Section Class 8000 Bend Radii in Class 8000 -03 3/16 16 3.00 -05 5/16 21 5.00 -07 7/16 24 5.75 -09 9/16 30 6.50 -11 11/16 33 7.75 -15 15/16 41 9.65 3.6.14 Burst Test The connected and disconnected coupling shall be capable of withstanding 250% of operating
41、pressure and 275 F temperature without fluid loss or rupture (see 4.6.14). 3.7 Identification of Product The coupling shall be marked for identification in accordance with MIL-STD-130. In addition, each coupling shall be permanently marked with the customer (NSN, MS, Purchase Assigned) part number,
42、manufacturers part number, and the manufacturers name or code identification number. Class number and operating pressure shall be part of product identification. Where space is not available, only the manufacturers trade mark and part number is required. 3.8 Workmanship Workmanship shall be of the q
43、uality necessary to produce couplings free from all defects which would affect proper functioning in service. 4. QUALITY ASSURANCE PROVISIONS 4.1 Inspection Responsibility The supplier is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specifie
44、d, the supplier may utilize their own or any other inspection facilities and services acceptable to the procuring agency. Inspection records of the examination and tests shall be kept complete and available to procuring agency as specified in the contract or order. The government or procuring agency
45、, or both reserve the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.2 Classification of Tests Tests shall consist of qualification tests and acceptance tests (se
46、e 4.3 and 4.4 respectively). SAE INTERNATIONAL AS4157B Page 8 of 17 4.3 Qualification Tests The qualification tests shall consist of the following tests and shall be conducted in the following order. All tests are described under 4.6. Unless otherwise specified, one test sample of each size shall be
47、 subjected to all indicated tests. Test samples shall be typical production units. a. Examination of Product: 4.6.1 b. Proof Pressure: 4.6.2 c. Extreme Temperature Functioning: 4.6.3 d. Leakage: 4.6.4 e. Vacuum: 4.6.5 f. Surge Flow: 4.6.6 g. Vibration: 4.6.7 h. Impulse: 4.6.8 i. Endurance: 4.6.9 j.
48、Manual Operation: 4.6.10 k. Air Inclusion: 4.6.11 l. Impact: 4.6.12 m. Pressure Drop: 4.6.13 n. Burst Pressure: 4.6.14 4.4 Acceptance Tests The acceptance tests shall consist of the following tests. All tests are described under 4.7. The detail test parameters and extent of the production testing sh
49、all be established by the procuring agency. a. Examination: 4.7.1 b. Proof Pressure: 4.7.2 c. Manual Operation: 4.7.3 d. Leakage: 4.7.4 4.5 Test Conditions 4.5.1 Test Fluid Unless otherwise specified, the fluid used shall be per MIL-H-83282 for all qualification testing. Other fluids may be specified by the procuring agency, if required, for system compatibility. SAE INTERNATIONAL AS4157B Page 9 of 17 4.5.2
