1、BSI Standards Publication BS ISO 9635-3:2014 Agricultural irrigation equipment Irrigation valves Part 3: Check valvesBS ISO 9635-3:2014 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 9635-3:2014. It supersedes BS ISO 9635-3:2006 which is withdrawn. The UK pa
2、rticipation in its preparation was entrusted to Technical Committee AGE/30, Irrigation and drainage equipment. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. U
3、sers are responsible for its correct application. The British Standards Institution 2014. Published by BSI Standards Limited 2014 ISBN 978 0 580 82811 9 ICS 65.060.35 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the autho
4、rity of the Standards Policy and Strategy Committee on 30 November 2014. Amendments issued since publication Date Text affectedBS ISO 9635-3:2014 ISO 2014 Agricultural irrigation equipment Irrigation valves Part 3: Check valves Matriel agricole dirrigation Vannes dirrigation Partie 3: Clapets antire
5、tour INTERNATIONAL STANDARD ISO 9635-3 Second edition 2014-11-15 Reference number ISO 9635-3:2014(E)BS ISO 9635-3:2014ISO 9635-3:2014(E)ii ISO 2014 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2014 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
6、 or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO
7、 copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in SwitzerlandBS ISO 9635-3:2014ISO 9635-3:2014(E)Contents Page Foreword iv 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 1 4 Design re
8、quirements 1 5 Performance requirements . 2 5.1 Mechanical strength . 2 5.2 Watertightness and airtightness 3 5.3 Hydraulic characteristics . 4 5.4 Resistance to chemicals and fertilizers 4 5.5 Endurance . 4 6 Conformity assessment . 4 6.1 General . 4 6.2 Type tests . 4 6.3 Control of production pro
9、cess and quality system 4 7 Marking 5 8 Packaging . 5 Annex A (normative) Test method for endurance of check valves 6 Bibliography 7 ISO 2014 All rights reserved iiiBS ISO 9635-3:2014ISO 9635-3:2014(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of nat
10、ional standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. Interna
11、tional organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those inten
12、ded for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.
13、iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document w
14、ill be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and expr
15、essions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT), see the following URL: Foreword Supplementary information. The committee responsible for this document is ISO/TC 23, Tractors and machinery for agricu
16、lture and forestry, Subcommittee SC 18, Irrigation and drainage equipment and systems. This second edition cancels and replaces the first edition (ISO 9635-3:2006), which has been technically revised. ISO 9635 consists of the following parts, under the general title Agricultural irrigation equipment
17、 Irrigation valves: Part 1: General requirements Part 2: Isolating valves Part 3: Check valves Part 4: Air valves Part 5: Control valvesiv ISO 2014 All rights reservedBS ISO 9635-3:2014Agricultural irrigation equipment Irrigation valves Part 3: Check valves 1 Scope This part of ISO 9635 specifies co
18、nstruction and performance requirements and test methods for check valves, intended for operation in irrigation systems with water at temperatures not exceeding 60 C, which can contain fertilizers and other chemicals of the types and concentrations used in agriculture. It is applicable to hydraulica
19、lly operated check irrigation valves of DN 15 diameter or greater, designed to operate in the fully open and fully closed positions, but which can also operate for extended time periods in any intermediate position. 2 Normative references The following documents, in whole or in part, are normatively
20、 referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 9635-1:2014, Agricultural irrigation equipment Irrigation valves
21、 Part 1: General requirements ISO 9644:2008, Agricultural irrigation equipment Pressure losses in irrigation valves Test method 3 T erms a nd definiti ons For the purposes of this document, the following terms and definitions apply. 3.1 check valve valve which is opened by the flow of water and clos
22、ed by the weight of a check mechanism or by mechanical pressure caused, for example, by a spring, permitting flow in one direction only and preventing reversal of flow 3.2 f lo w c o e f f ic ie nt K v proportionality factor equal to the flow rate, in cubic metres per hour, of water at a temperature
23、 between 5 C and 50 C, passing through a fully open valve and causing a loss of static head of 1 bar Note 1 to entry: v , where Q is the flow rate in cubic metres per hour (m 3 /h), and p is the pressure across the valve in bar or kilopond/kilogram-force per square centimetre (kp/cm 2 , kgf/cm 2 ).
24、Note 2 to entry: 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm 2 . Note 3 to entry: Adapted from EN 7363. 4 Design requirements Check valves shall be designed in accordance with ISO 9635-1:2014, Clause 4. INTERNATIONAL ST ANDARD ISO 9635-3:2014(E) ISO 2014 All rights reserved 1BS ISO 9635-3:2014ISO 9635-
25、3:2014(E) Check valves may be equipped with a device to assist closure or balance the weight of the obturator. However, such valves are not considered to have a mechanically-operated obturator. The manufacturer shall indicate in the relevant technical documentation the orientations in which the chec
26、k valves fulfil the requirements of this International Standard. It is recommended that the valves be designed to permit integral repair and maintenance without removing the valve body from the line. 5 Performance requirements 5.1 Mechanical strength 5.1.1 Resistance of shell and all pressure-contai
27、ning components to internal pressure Carry out testing in accordance with ISO 9635-1:2014, 5.2.1. Test results shall comply with the requirements of ISO 9635-1:2014, 5.2.1. 5.1.2 Resistance of obturator to differential pressure Carry out testing in accordance with ISO 9635-1:2014, 5.2.2. Perform the
28、 test with the pressure applied to the downstream side of the obturator. Test results shall comply with the requirements of ISO 9635-1:2014, 5.2.2. After testing, the obturator shall not be jammed nor wedged. The differential pressure and flow rate necessary to open the obturator shall not exceed th
29、e initial values declared by the manufacturer by more than 10 %. After completion of the test, the differential pressure and flow rate necessary to fully open the obturator shall not exceed the initial values by more than 10 %. 5.1.3 Resistance of valve to bending Carry out testing in accordance wit
30、h ISO 9635-1:2014, 5.2.3. Perform the test with the pressure applied to the downstream side of the obturator. Test results shall comply with the requirements of ISO 9635-1:2014, 5.2.3. The bending moment, M, to be applied during the test shall be in accordance with Table 1, as a function of DN. The
31、bending moment should be equal to the moment applied for a standard length (6 m) pipe. Table 1 Bending moments DN Bending moment M N m 8 610 10 615 20 640 25 670 32 730 40 825 NOTE For plastic-bodied valves, the applied bending moment should be equal to the bending moment exerted by a 6 m long plast
32、ic tube of the same diameter (DN).2 ISO 2014 All rights reservedBS ISO 9635-3:2014ISO 9635-3:2014(E) DN Bending moment M N m 50 1 050 65 1 400 80 1 500 100 2 200 125 3 200 150 4 800 200 7 200 250 11 000 300 15 000 350 19 000 400 24 000 450 28 000 500 33 000 NOTE For plastic-bodied valves, the applie
33、d bending moment should be equal to the bending moment exerted by a 6 m long plastic tube of the same diameter (DN). 5.2 Watertightness and airtightness 5.2.1 Watertightness and airtightness of shell and all pressure-containing components 5.2.1.1 Internal pressure Requirements and testing shall be i
34、n accordance with ISO 9635-1:2014, 5.3.1.1. 5.2.1.2 External pressure Carry out testing in accordance with ISO 9635-1:2014, 5.3.1.2. Test results shall comply with the requirements of ISO 9635-1:2014, 5.3.1.2. 5.2.2 Seat tightness 5.2.2.1 Seat tightness at high differential pressure Carry out testin
35、g in accordance with ISO 9635-1:2014, 5.3.2.1. For a type test, continue the test for at least 10 min. Perform the test with the pressure applied to the downstream side of the obturator. Test results shall comply with the requirements of ISO 9635-1:2014, 5.3.2.1. 5.2.2.2 Seat tightness at low differ
36、ential pressure Carry out testing in accordance with ISO 9635-1:2014, 5.3.2.2. For a type test, continue the test for at least 10 min. Perform the test with the pressure applied to the downstream side of the obturator.Table 1 (continued) ISO 2014 All rights reserved 3BS ISO 9635-3:2014ISO 9635-3:201
37、4(E) Test results shall comply with the requirements of ISO 9635-1:2014, 5.3.2.2. 5.3 Hydraulic characteristics Test results shall comply with the requirements of ISO 9635-1:2014, 5.4. The characteristic given by the manufacturer shall be the head loss as a function of flow or the K vvalue. When mea
38、sured in accordance with ISO 9644:2008, Clause 4, the head loss shall not be more than 1,1 times the value indicated by the manufacturer. 5.4 Resistance to chemicals and fertilizers Carry out testing in accordance with ISO 9635-1:2014, 5.5. Test results shall comply with the requirements of ISO 9635
39、-1:2014, 5.5. 5.5 Endurance Check valves shall keep their functional capacity after an actual number per Annex A (2 500 cycles) of operations (opening/closing cycles). The velocity should be approximately 1 m/s. In order to verify this requirement, test the check valve as set out in Annex A for 2 50
40、0 opening/closing cycles. Following this, it shall still pass the leak-tightness tests as set out in 5.2.1 and 5.2.2, and no breakage of any part shall be detected by visual inspection after the dismantling of the valve. Testing is not required for check valves greater than DN 300. 6 Conformity asse
41、ssment 6.1 General Test results shall comply with the requirements of ISO 9635-1:2014, 6.1. 6.2 Type tests Test results shall comply with the requirements of ISO 9635-1:2014, 6.2. Perform the type tests specified in Table 2. Carry them out with the valve in the horizontal position, or in the possibl
42、e positions as indicated by the manufacturer, depending on the possible uses of the check valve. 6.3 Control of production process and quality system Test results shall comply with the requirements of ISO 9635-1:2014, 6.3. NOTE The production control tests given in Table 2 are for information only.
43、Table 2 Requirements and testing Subclause of ISO 9635-1:2014 Corresponding requirement Type tests a Production tests (informative) 4.1 Materials See drawings and part lists 4.2 DN See drawings 4.3 Pressures See technical documenta- tion 4.4 Temperatures See materials aReferences to subclauses in th
44、is column are to this part of ISO 9635.4 ISO 2014 All rights reservedBS ISO 9635-3:2014ISO 9635-3:2014(E) Subclause of ISO 9635-1:2014 Corresponding requirement Type tests a Production tests (informative) 4.5 Design of shell and obturator See test report or calculation report 4.6 End types and inter
45、changeability See drawings and marking 4.7 Operating direction See drawings 4.8 Maximum water velocity See Clause 4 4.9 All materials, including lubricants, in contact with water intended for human consumption See test reports in accord- ance with national regula- tions 4.10 Internal corrosion and a
46、geing resistance See drawings, part lists and technical documentation Visual inspection of coatings 4.11 External corrosion and ageing resistance See drawings, part lists and technical documentation Visual inspection of coatings 5.2.1 Resistance of shell and of all pres- sure-containing components t
47、o internal pressure See 5.1.1 See 5.2.1 5.2.2 Resistance of obturator to differential pressure See 5.1.2 5.2.3 Resistance of valves to bending See 5.1.3 5.3.1.1 Leak-tightness to internal pressure See 5.2.1.1 See 5.3.1.1 5.3.1.2 Leak-tightness to external pressure See 5.2.1.2 5.3.2.1 Seat tightness
48、at high differential pres- sure See 5.2.2.1 See 5.3.2.1 5.3.2.2 Seat tightness at low differential pressure See 5.2.2.2 5.4 Hydraulic or airflow characteristics See 5.3 5.5 Resistance to chemicals and fertilizers See 5.4 5.6 Endurance See 5.5 aReferences to subclauses in this column are to this part
49、 of ISO 9635. 7 Marking Requirements shall be in accordance with ISO 9635-1:2014, Clause 7. In addition, the direction of flow shall be marked. 8 Packaging Requirements shall be in accordance with ISO 9635-1:2014, Clause 8.Table 2 (continued) ISO 2014 All rights reserved 5BS ISO 9635-3:2014ISO 9635-3:2014(E) Annex A (normative) Test method for endurance of check valves A.1 General Perform the test with water at ambient temperature, initially in a no-flow situa
