SAE AS 5781A-2015 Retainers (Backup Rings) Hydraulic and Pneumatic Polytetrafluoroethylene Resin Single Turn Scarf-Cut For Use in AS4716 Glands.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 there
2、from, 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 2015 SAE International All rights reserved. No part of this p
3、ublication 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: +1 724-776-497
4、0 (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:/www.sae.org/technical/standards/AS5781AAEROSPACESTANDARDAS5781 REV. A Issued 2007-07 Reaffirmed 2013-11 Revised 2
5、015-04 Superseding AS5781Retainers (Backup Rings), Hydraulic and Pneumatic, Polytetrafluoroethylene Resin, Single Turn, Scarf-Cut, For Use in AS4716 Glands RATIONALE This revision updates the metric conversions and includes some minor editorial changes. 1. SCOPE This SAE Aerospace Standard (AS) cove
6、rs scarf-cut polytetrafluoroethylene (PTFE) retainers (backup rings) for use in glands in accordance with AS4716. They are for use in hydraulic and pneumatic system components as anti-extrusion devices in conjunction with O-rings, packings and other elastomeric seals for static and dynamic applicati
7、ons. Because of the construction of groove dimensions, backup rings specific to rod applications are designated “R” - Rod (Female), backup rings specific to piston applications are designated “P” - Piston (Male). Piston and rod types of virgin pigmented PTFE are also identified by color code which a
8、lso distinguishes parts to this standard from those made from virgin PTFE to other standards. 1.1 Field of Application Backup rings specified herein have been designed for a temperature range of -65 to 275 F (-54 to 135 C) and a nominal operating pressure of 3000 psi (20 684 kPa) for code 09 materia
9、l (AMS3678/9). Alternate materials to AMS3678 are offered for more arduous operating conditions. This specification includes material tests but does not include hydraulic or pneumatic performance tests. 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this document to
10、 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 document and references cited herein, the text of this document
11、 takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. SAE INTERNATIONAL AS5781A Page 2 of 29 2.1.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-
12、606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org.AS4716 Gland Design, O-ring and Other Elastomeric Seals AMS3678 Polytetrafluoroethylene (PTFE) Moldings and Extrusions Unfilled, Pigmented, and Filled Components AMS3678/2 Type 2 - 15% Graphite Filled Virgin Polytetrafluo
13、roethylene (PTFE) Moldings or Extrusions AMS3678/3 Type 3 - 15% Glass, 5% Molybdenum Disulfide Filled Virgin Polytetrafluoroethylene (PTFE) Moldings or Extrusions AMS3678/5 Type 5 - Virgin Polytetrafluoroethylene (PTFE) Moldings or Extrusions with Pigment AMS3678/6 Type 6 - 60% Bronze Filled Virgin
14、Polytetrafluoroethylene (PTFE) Moldings or Extrusions AMS3678/7 Type 7 - Virgin Polytetrafluoroethylene (PTFE) Moldings or Extrusions with 25% Carbon and Graphite AMS3678/8 Type 8 - Virgin Polytetrafluoroethylene (PTFE) Moldings or Extrusions with 10% Carbon Fiber AMS3678/9 Type 9 - Virgin Polytetra
15、fluoroethylene (PTFE) Moldings with Pigment for AS4716 and AS5857 Backup Rings AMS3678/10 Type 10 - Virgin Polytetrafluoroethylene (PTFE) Moldings or Extrusions with 15% Carbon Fiber 2.1.2 U.S. Government Publications Copies of these documents are available online at http:/quicksearch.dla.mil.MIL-ST
16、D-2073-1 Standard Practice for Military Packaging 2.1.3 ASME Publications Available from ASME, Two Park Avenue, New York, NY 10016-5990, Tel: 800-843-2763, www.CustomerCareasme.org.ASME Y 14.5-2009 Dimensioning and Tolerancing 2.2 Related Publications The following publications are provided for info
17、rmation purposes only and are not a required part of this SAE Aerospace Technical Report. 2.2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org.AS5857 Gland D
18、esign, O-ring and Other Elastomeric Seals, Static Applications AS5860 Retainers, (Back-Up Rings), Hydraulic and Pneumatic, Polytetrafluoroethylene Resin, Single Turn, Static Gland AS5861 Retainers, (Back-Up Rings), Hydraulic and Pneumatic, Polytetrafluoroethylene Resin, Solid, Static Gland SAE INTER
19、NATIONAL AS5781A Page 3 of 29 AMS3678/1 Type 1 - Virgin Polytetrafluoroethylene (PTFE) Moldings or Extrusions AMS3678/4 Type 4 - 25% Glass Filled Virgin Polytetrafluoroethylene (PTFE) Moldings or Extrusions 2.2.2 U.S. Government Publications Copies of these documents are available online at http:/qu
20、icksearch.dla.mil.MIL-G-5514 Gland Design; Packing, Hydraulic, General Requirements For (Inactive for New Design) 3. TECHNICAL REQUIREMENTS 3.1 Metric Equivalents Dimensions and properties in inch/pound/Fahrenheit units are primary; dimensions and properties in SI units are shown as the approximate
21、equivalents of the primary units and are presented only for information. 3.2 Cylinder Breathing, Material Contraction and Expansion Consideration has been made to accommodate cylinder breathing on piston applications, calculated at 0.002 inch/inch diameter/1000 psi (0.051 mm/mm diameter/6895 kPa) al
22、ong with PTFE contraction to ensure a minimum 50% lap at the scarf-cut at -65 F (-54 C). This has required an increase in the diameter on certain larger sizes and a slight overlap at ambient will, therefore, be apparent. These parts have been designed such that the overlap at 275 F (135 C) will not
23、result in axial compression of the O-rings local to the scarf-cut, even in the worst tolerance stack-up situation. When thermal cycling is experienced under even moderate pressures, some circumferential shrinking may occur leading to the scarf cut gap increasing which could result in O-ring failure.
24、 Performance testing under these conditions is recommended. 3.3 Materials and Applications 3.3.1 Primary Material Code 09, Virgin PTFE with pigment: Parts made to material code 09 of this standard shall conform to AMS3678/9, Pigmented Virgin PTFE, Molded. x Parts made to material code 09 of this sta
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