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 2015 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:/www.sae.org/technical/standards/J1235_201509 SURFACE VEHICLE RECOMMENDED PRACTICE J1235 SEP2015 Issued 1978-06 R
5、eaffirmed 1986-03 Revised 2015-09 Superseding J1235 MAR1986 Measuring and Reporting the Internal Leakage of a Hydraulic Fluid Power Valve RATIONALE This standard is being revised to update references, fluid specifications and test equipment accuracy. 1. SCOPE This procedure applies to directional co
6、ntrol valves or other valves which in various positions direct or block fluid flow as applied to Off-Road Self-Propelled Work Machines as referenced in SAE J1116. 1.1 Purpose To provide a uniform laboratory procedure for measuring and reporting the fluid flow (leakage) across a restricted flow path
7、in a hydraulic fluid power valve. 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. 2.1.1 SAE Publication Available from SAE International,
8、400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. SAE J1116 Categories of Off-Road Self-Propelled Work Machines SAE J1276 Standard Fluid for Hydraulic Component Tests 2.1.2 ISO Publications Available from American
9、 National Standards Institute, 25 West 43rd Street, New York, NY 10036-8002, Tel: 212-642-4900, www.ansi.org. ISO 4406 Hydraulic Fluid Power - Fluids - Method for Coding the Level of Contamination by Solid Particles ISO 5598 Fluid Power Systems and Components - Vocabulary SAE INTERNATIONAL J1235 SEP
10、2015 Page 2 of 5 3. DEFINITIONS (For definitions of terms not herein defined, see ISO 5598.) 3.1 TEST PRESSURE The differential pressure between input and output ports at which leakage will be determined. 3.2 INPUT PORT Any port into which flow is directed or pressure is applied for purposes of this
11、 test. 3.3 OUTPUT PORT Any port from which flow exits for purposes of this test. 3.4 CONTROL Any adjustable feature integral with the test valve that determines the restricted flow path. 3.5 SPECIFIED DATA That basic information furnished in the request for the test as indicated in Section 6. 4. UNI
12、TS 4.1 The International System of Units (SI) is used herein in accordance with SAE TSB 003. 4.2 Approximate conversions to U.S. Customary units are given for information purposes. These appear in parentheses after their SI counterpart. 5. SUMMARY OF SPECIFIED DATA 5.1 Specify the following informat
13、ion on all requests for this test: 5.1.1 A description of valve. 5.1.2 A description of fluid (if different from paragraph 10.1). 5.1.3 The fluid temperature (if different from the standardized value in paragraph 10.2). 5.1.4 Test pressure. 5.1.5 The input ports. 5.1.6 The output ports. 5.1.7 The co
14、ntrol position and flow paths. 6. GENERAL PROCEDURE 6.1 Conduct the test in accordance with the fixed values specified by the test request. (Reference Section 9). 6.2 Use only standardized values, shown in Section 11, for catalog information and sales literature. NOTE: For close coordination between
15、 testing laboratories, similar equipment, fluid, and procedures are recommended. SAE INTERNATIONAL J1235 SEP2015 Page 3 of 5 7. TEST CONDITIONS 7.1 Accuracy Maintain equipment accuracy within the limits shown in the following table: Table 1 - Test equipment accuracy Test Condition Maintain Within Fl
16、ow 2%Pressure 2% Temperature 0.6 C (1 F) Time 2%7.2 Contamination Level Oil cleanliness code in accordance with ISO 4406 of -/16/13 (maximum). 8. TEST PROCEDURE 8.1 Install the test valve in the test circuit using the input ports and output ports indicated in the test request. 8.2 Actuate or set the
17、 control for the flow paths indicated on the test request. 8.3 Ensure that valve body temperature has stabilized to within 3 C (5 F) of the temperature of the oil or the external temperature rise rate of the valve body is less than 3 C (5 F) per minute. 8.4 Establish and maintain the specified test
18、pressure. 8.5 Cycle the input control at least three times within 1 min and return to the specified control position. 8.6 Start the measurement of leakage rate after it has stabilized or between 15 and 60 s after completion of paragraph 8.5. 8.7 Finish measurement of leakage rate between 15 and 60 s
19、 after start of measurement. 8.8 Perform paragraphs 8.2 through 8.7 three times. 8.9 Record and report all readings (see Figure 1). SAE INTERNATIONAL J1235 SEP2015 Page 4 of 5 Figure 1 - Example test data summary 9. DATA PRESENTATION Include the following information with the data presentation: 9.1
20、Leakage rate (three readings) and type of measurement method used (beaker vs flowmeter). 9.2 Fluid temperature. 9.3 Valve body temperature. 9.4 Valve description. SAE INTERNATIONAL J1235 SEP2015 Page 5 of 5 9.5 Test pressure. 9.6 Control position and leak paths. 9.7 Input ports. 9.8 Output ports. 9.
21、9 Date of test. 9.10 Test agency. 9.11 Description of fluid. 10. STANDARDIZED VALUES 10.1 All tests shall use fluid in accordance with SAE J1276 unless explicitly stated otherwise. If fluid other than SAE J1276 is used, each test document shall minimally include fluid type, ISO viscosity grade, VI i
22、ndex, and viscosity at 40 C and at 100 C of the fluid used in the test. 10.2 Fluid temperature shall be 50 + 3 C (122 F + 5 F) unless explicitly stated otherwise. 11. IDENTIFICATION STATEMENT Use the following statement in catalogs and sales literature when electing to comply with this voluntary sta
23、ndard: Leakage rates obtained and presented in accordance with SAE J1235. 12. NOTES 12.1 Marginal Indicia A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this do
24、cument. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. PREPARED BY THE SAECTTC C1, HYDRAULIC SYSTEMS COMMITTEE
