1、BSI Standards Publication BS ISO 9635-4:2014 Agricultural irrigation equipment Irrigation valves Part 4: Air valvesBS ISO 9635-4:2014 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 9635-4:2014. It supersedes BS ISO 9635-4:2006 which is withdrawn. The UK part
2、icipation 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. Use
3、rs are responsible for its correct application. The British Standards Institution 2014. Published by BSI Standards Limited 2014 ISBN 978 0 580 82812 6 ICS 65.060.35 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authori
4、ty of the Standards Policy and Strategy Committee on 30 November 2014. Amendments issued since publication Date Text affectedBS ISO 9635-4:2014 ISO 2014 Agricultural irrigation equipment Irrigation valves Part 4: Air valves Matriel agricole dirrigation Vannes dirrigation Partie 4: Vannes de purge da
5、ir INTERNATIONAL STANDARD ISO 9635-4 Second edition 2014-11-15 Reference number ISO 9635-4:2014(E)BS ISO 9635-4:2014ISO 9635-4:2014(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 o
6、r 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 c
7、opyright 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 9635-4:2014ISO 9635-4:2014(E)Contents Page Foreword iv 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 1 4 Design requ
8、irements 2 5 Performance requirements . 2 5.1 General . 2 5.2 Mechanical strength . 2 5.3 Watertightness 2 5.4 Airflow characteristics . 3 5.5 Resistance to chemicals and fertilizers 4 5.6 Endurance . 4 6 Conformity assessment . 5 6.1 General . 5 6.2 Type tests . 5 6.3 Control of production process
9、and quality system 5 7 Marking 6 8 Packaging . 6 Annex A (normative) T est method for airflo w char act eristics of v al v es with air r elease function .7 Annex B (normative) T est method for airflo w char act eristics of v al v es with air intak e function .9 Annex C (normative) Test method for en
10、durance of valves with air intake and/or air release functions .12 Bibliography .14 ISO 2014 All rights reserved iiiBS ISO 9635-4:2014ISO 9635-4:2014(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The w
11、ork 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. International organizations, governmental and non-govern
12、mental, 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 intended for its further maintenance are described in
13、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 (www.iso.org/directives). Attention is drawn to the possib
14、ility 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 will be in the Introduction and/or on the ISO list of
15、patent declarations received (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 expressions related to conformity assessment, as well as info
16、rmation 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 agriculture and forestry, Subcommittee SC 18, Irrigation and dr
17、ainage equipment and systems. This second edition cancels and replaces the first edition (ISO 9635-4:2006) which has been technically revised. ISO 9635 consists of the following parts, under the general title Agricultural irrigation equipment Irrigation valves: Part 1: General requirements Part 2: I
18、solating valves Part 3: Check valves Part 4: Air valves Part 5: Control valvesiv ISO 2014 All rights reservedBS ISO 9635-4:2014Agricultural irrigation equipment Irrigation valves Part 4: Air valves 1 Scope This part of ISO 9635 specifies construction and performance requirements and test methods for
19、 air 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 hydraulically operated air irrigation valves of DN 15 diameter or greate
20、r, designed to be directly operated, i.e. the force is applied to the obturator by the float, either directly or via a mechanical linkage. The valves can be operated by a force applied through an adjustable pilot valve. 2 Normative references The following documents, in whole or in part, are normati
21、vely 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 va
22、lves Part 1: General requirements ISO 9635-2:2014, Agricultural irrigation equipment Irrigation valves Part 2: Isolating valves 3 T erms a nd definiti ons For the purposes of this document, the terms and definitions given in ISO 9635-1:2014 and the following apply. 3.1 air valve f lo at - t y p e pu
23、 r g e r self-operating float-type valve for the evacuation of air from, or the ingress of air into water pipelines Note 1 to entry: Such valves can be single-float or double-float and can fulfill one or more or the following functions: air release, air intake. 3.2 air release function discharge of
24、air from a water pipeline or appliance 3.3 air intake function vacuum relief function admittance of air to a water pipeline or appliance 3.4 air venting function continuous acting air vent function purging of entrapped air from a water pipeline in service under pressure INTERNATIONAL ST ANDARD ISO 9
25、635-4:2014(E) ISO 2014 All rights reserved 1BS ISO 9635-4:2014ISO 9635-4:2014(E) 4 Design requirements Air valves shall be designed in accordance with ISO 9635-1:2014, Clause 4. In addition, these valves may be fitted with an integrated isolating device which shall be in accordance with ISO 9635-2:2
26、014. 5 Performance requirements 5.1 General Perform all tests on the valve as delivered to the test facility. 5.2 Mechanical strength 5.2.1 Resistance of shell and all pressure-containing components to internal pressure Carry out testing in accordance with ISO 9635-1:2014, 5.2.1. For double-float va
27、lves, the obturators may be tested simultaneously or separately. Test results shall comply with the requirements of ISO 9635-1:2014, 5.2.1. 5.2.2 Resistance of obturator to differential pressure Tested within 5.2.1. 5.2.3 Resistance of valves to bending Not applicable. However, testing of bending re
28、sistance may be an optional requirement for air valves, if bending resistance is specified by the customer. 5.2.4 Resistance of valves to operating loads Not applicable, except for any integrated isolating device, which shall be in accordance with ISO 9635-2:2014, 5.2.4. 5.3 Watertightness 5.3.1 Wat
29、ertightness of shell and all pressure-containing components 5.3.1.1 Internal pressure The requirement of watertightness to internal pressure is fulfilled by compliance with 5.2.1. 5.3.1.2 External pressure Not applicable, except for any integrated isolating device, which shall be in accordance with
30、ISO 9635-2:2014, 5.3.1.2. 5.3.2 Seat tightness 5.3.2.1 Seat tightness at high pressure Carry out testing in accordance with ISO 9635-1:2014, 5.3.2.1, using water as the test fluid. The leakage rate shall be rate A. For a type test, continue the test for at least 10 min. For double-float valves, the
31、obturators may be tested simultaneously or separately. Test results shall comply with the requirements of ISO 9635-1:2014, 5.3.2.1.2 ISO 2014 All rights reservedBS ISO 9635-4:2014ISO 9635-4:2014(E) 5.3.2.2 Seat tightness at low pressure Carry out testing in accordance with ISO 9635-1:2014, 5.3.2.2,
32、using water as the test fluid. The leakage rate shall be rate A. For a type test, continue the test for at least 10 min. For double-float valves, the obturators may be tested simultaneously or separately. Test results shall comply with the requirements of ISO 9635-1:2014, 5.3.2.2. 5.3.3 Maximum oper
33、ating torque (MOT) for operation and tightness Not applicable, except for air valves with an integrated isolating device which shall be in accordance with ISO 9635-2:2014, 5.3.3. 5.4 Airflo w char act eri stics Test results shall comply with the requirements of ISO 9635-1:2014, 5.4. The characterist
34、ics given by the manufacturer in the form of a graph or table shall be the airflow as a function of inlet pressure. When this is measured according to the conditions defined hereafter in the relevant subclauses of this part of ISO 9635, the flow shall be not less than 90 % of the value indicated by
35、the manufacturer at a minimum of three points on the curve, these points being indicative of the range and functions of the valve. Show the performance data at standard conditions of temperature and barometric pressure. 5.4.1 Air release function Conduct the type test as set out in Annex A. Compare
36、the results with the values given in the manufacturers catalogue and the difference shall be no greater than 10 %. 5.4.2 Air intake function Conduct the type test as set out in A n ne x B . Compare the results with the values given in the manufacturers catalogue and the difference shall be no greate
37、r than 10 %. 5.4.3 Air venting function Verify the air venting function by measuring the section of the small orifice of the valve, calculating the flow through it at sonic conditions and comparing the result with the value given in the manufacturers catalogue. The difference shall be no greater tha
38、n 10 %. To calculate the flow, use the M51 AWWA formula, changing the units from US units to SI units. ISO 2014 All rights reserved 3BS ISO 9635-4:2014ISO 9635-4:2014(E) For sonic flow, the most usual, it is possible to use Formula (1): (1) whereQ is the flow in Nm 3 /s (normal conditions);C is the
39、discharge coefficient;A is the area of orifice;P is the absolute pressure in the pipe (Pa); is the air density in normal conditions (kg/Nm 3 );R is the air constant (287,05 m 2 /s 2 /K);T is the temperature in the pipe (K). Measure the actual air venting capability in a manner similar to the air rel
40、ease function (see 5.4.1). Compare the results with the values given in the manufacturers catalogue and the difference shall be no greater than 10 %. We should consider the influence of the air relative humidity (RH) which is a critical factor when measuring the maximum allowable pressure in the pip
41、e to prevent the float closing without water, i.e. a higher RH will cause an earlier closure. 5.5 Resistance to chemicals and fertilizers Conduct testing in accordance with ISO 9635-1:2014, 5.5. Test results shall comply with the requirements of ISO 9635-1:2014, 5.5. 5.6 Endurance 5.6.1 Endurance of
42、 valves with air intake and/or air release functions Evaluate the endurance of a valve with air intake and/or air release functions by subjecting the valve to 250 consecutive cycles of filling and draining in accordance with Annex C, with the pressure varying from atmospheric to the allowable operat
43、ing pressure. The valve shall open and close fully during the test and shall pass the watertightness tests as set out in a 5.3.1 and 5.3.2 after the 250 cycles. 5.6.2 Endurance of valves with air venting function Evaluate the endurance of a valve with air venting function by subjecting the valve to
44、2 500 consecutive cycles of air venting. This may be achieved by continuous injection of air into the system, allowing the valve to cycle automatically, or by cyclic injection of air, depending on the type of valve. The valve shall open and close fully at each cycle of the test and shall pass the wa
45、tertightness tests as set out in 5.3.1 and 5.3.2 after the 2 500 cycles. Perform the test at a pressure equal to the allowable operating pressure. 5.6.3 Long-term unseating test This is an accelerated test to ensure that the obturator will release after being under pressure for a long duration.4 ISO
46、 2014 All rights reservedBS ISO 9635-4:2014ISO 9635-4:2014(E) Carry out the test on a valve, mounted vertically, at a temperature of 50 C (+5 C), kept under 1,2 the hydraulic maximum allowable operating pressure +20 % to 0 % for five days. Following this, release the pressure and check that the valv
47、e opens normally. The valve shall then pass the watertightness tests as set out in 5.3.1 and 5.3.2. Test valves with several functions (air release, air intake, and air venting) without isolating the parts ensuring the compliance of the different functions. 6 Conformity assessment 6.1 General Test r
48、esults shall comply with the requirements of ISO 9635-2:2014, 6.1. 6.2 Type tests Test results shall comply with the requirements of ISO 9635-2:2014, 6.2. Perform the type tests as set out in Table 1. 6.3 Control of production process and quality system Test results shall comply with the requirement
49、s of ISO 9635-2:2014, 6.3. NOTE The production control tests given in Table 1 are for information only. Table 1 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 4.5 Design of shell and float See test report or calcula- tion report 4.6 End ty
