SAE-AS-4251-1988-R2004.pdf
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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 therefr
2、om, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2004 SAE International All rights reserved. No part of this publication may
3、 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: 724-776-4970 (outside USA) Fa
4、x: 724-776-0790 Email: custsvcsae.org SAE WEB ADDRESS:http:/www.sae.org AEROSPACE STANDARD AS4251 Issued1988-07 Reaffirmed2004-04 Coupling Assemblies, Non-Locking Probe Style, Self-Aligning, Self-Sealing Disconnects 1.SCOPE: This specification establishes the requirements for a probe type self-seali
5、ng, self-aligning, non-locking coupling intended for aerospace hydraulic and cooling systems. 1.1Classification: Fluid self-sealing disconnect couplings shall be of the following classes: Class 500:500 lbf/in2 rated pressure (psi) Class 4000:4000 lbf/in2 rated pressure (psi) 2.APPLICABLE DOCUMENTS:
6、2.1Issues of Documents: The following documents of the issue in effect on date of invitation for bids, or request for proposal, form a part of this specification to the extent specified herein. 2.1.1Military Specifications: MIL-H-5440Hydraulic Systems: Design, Installation and Test of Aircraft, Gene
7、ral Specification for MIL-H-5606Hydraulic Fluid, Petroleum Base, Aircraft and Ordnance MIL-H-8775Hydraulic System Components, Aircraft and Missile, General Specification for MIL-H-83282Hydraulic Fluid, Fire Resistant Synthetic Hydrocarbon Base, Aircraft MIL-P-83461Packing, Preformed, Petroleum Hydra
8、ulic Fluid Resistant, Improved Performance at 275 deg F MIL-R-8791Retainer, Packing, Hydraulic and Pneumatic, Tetrafluoroethylene Resin MIL-STD-129Marking for Shipment and Storage MIL-STD-130Identification Markings of U.S. Military Property MIL-STD-810Environmental Test Methods SAE AS4251 - 2 - 2.2O
9、ther Publications: 2.2.1Society of Automotive Engineers (SAE): AIR1047BA Guide for the Selection of Quick-Disconnect Couplings for Aerospace Fluid Systems ARP24BDetermination of Hydraulic Pressure Drop ARP1383Impulse Testing of Hydraulic Actuators, Valves, Pressure Containers and Similar Fluid Syste
10、m Components 3.REQUIREMENTS: 3.1Qualification: The couplings furnished under this specification shall be a product which has been tested, and has passed the qualification tests specified herein, and has been approved by the Procuring Agency or Prime Contractor. 3.2General Specification: The requirem
11、ents of MIL-H-8775 apply to this specification except as specified herein. 3.3 Materials: The coupling shall be constructed of materials that will not change the composition of or be adversely affected by specified fluids. Materials, processes and parts shall meet the design requirements and intent
12、of MIL-H-8775 for Classes 500 and 4000, fluids and material compatibility tests shall be conducted by the supplier to demonstrate the satisfactory performance of the couplings. 3.4Design and Construction: The configuration, dimensions, and other details of design of the couplings shall conform to ap
13、plicable Specification Control Drawings. The design objective shall be to obtain the envelope dimensions per Table IV herein and lightest weight commensurate with meeting performance requirements herein. The misalignment provision in the nipple half shall be 0.020 in radial; angular misalignment sha
14、ll be specified by the Procuring Agency. When coupled, the coupling shall be such that it will permit fluid flow in either direction in accordance with the rated flow and pressure drop as specified in Table I. Flow shall not be blocked under surge conditions. (Reference Table IV for Envelope Dimensi
15、ons). A thermal relief valve shall be incorporated as an optional design feature, if specified by the Procuring Agency. SAE AS4251 - 3 - TABLE I - Rated Flow and Pressure Drop 3.4.1Temperature Range: Couplings shall be designed to operate throughout the temperature range specified by 3.6.3. 3.4.2Sea
16、ling and Fluid Loss: The couplings shall, when disconnected, seal the ends of the disconnected lines at the point of disconnection and shall not permit external leakage during any phase of connection or disconnection. Fluid loss (spillage) as specified in Table II is not considered to be external le
17、akage. Both halves of the coupling shall seal fluid under both low and high pressures (see 4.6.4). TABLE II - Air Inclusion and Fluid Loss 3.4.3Seals: The MIL-P-83461 Packing Material and MIL-R-8791 Retainer Material shall be used with MIL-H-5606, or MIL-H-83282 Hydraulic Fluid. Packing and retainer
18、 material for other fluids shall be specified by the Procuring Agency. However, the supplier shall demonstrate that the performance of the coupling is satisfactory with the packing and retainer materials used. SAE AS4251 - 4 - 3.4.4Operation: The couplings shall be so designed that they can be conne
19、cted and disconnected while mounted in their respective manifolds or fixtures. It shall be possible to connect and disconnect with an internal pressure, as shown in Table III, applied to both halves and to each one- half respectively (see 4.6.10). TABLE III - Coupling Forces and Separating Force Wit
20、h the Pressure Indicated in Both Halves SAE AS4251 - 5 - TABLE IV - Envelope Dimensions SAE AS4251 - 6 - 3.5Interchangeability: It shall be impossible to interconnect different tube sizes and couplings of different pressure classes shall not be capable of cross-coupling. Coupling halves of the same
21、part number shall be interchangeable and cross-couple all referenced mating halves. 3.6Performance: The self-sealing couplings furnished under this specification shall perform satisfactorily when conforming to the following performance requirements. 3.6.1Envelope, Weight, Materials: Each coupling ha
22、lf must conform to the applicable purchaser and supplier envelope dimensions, weight control, materials, and finishes. Table IV is provided with some envelope dimension guidelines. 3.6.2Proof Pressure: Each coupling half must meet operational and leakage requirements after being subjected to proof p
23、ressure of 150% of rated pressure for a period of 1 min (see 4.6.2). 3.6.3Extreme Temperature Functioning: Each coupling half shall show no malfunction during or after being subjected to extreme temperature testing from -65 to 275 F unless otherwise specified (see 4.6.3). 3.6.4Leakage: Coupling halv
24、es shall meet specified leakage requirements at 30 in static head of test fluid and at rated pressure (see 4.6.4). 3.6.5Vacuum: The connected and disconnected coupling shall meet inward leakage requirements with no evidence of malfunction or degradation, with equivalent of 10 in of Hg applied and li
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