1、BSI Standards PublicationBS ISO 13693-2:2015Irrigation equipment Safetydevices for chemigationPart 2: Chemigation valve assemblies fromDN 75 (3“) to DN 350 (14“)BS ISO 13693-2:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 13693-2:2015.The UK participatio
2、n in its preparation was entrusted to TechnicalCommittee AGE/30, Irrigation and drainage equipment.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are respon
3、sible for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 80609 4ICS 65.060.35Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards P
4、olicy and Strategy Committee on 28 February 2015.Amendments issued since publicationDate Text affectedBS ISO 13693-2:2015 ISO 2015Irrigation equipment Safety devices for chemigation Part 2: Chemigation valve assemblies from DN 75 (3”) to DN 350 (14”)Matriel dirrigation Dispositifs de scurit pour lap
5、plication de produits chimiques par irrigation Partie 2: Installations de vannes pour application de produits chimiques par irrigation de DN 75 (3”) DN 350 (14”)INTERNATIONAL STANDARDISO13693-2First edition2015-02-15Reference numberISO 13693-2:2015(E)BS ISO 13693-2:2015ISO 13693-2:2015(E)ii ISO 2015
6、 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, with
7、out 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 copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in Switze
8、rlandBS ISO 13693-2:2015ISO 13693-2:2015(E)Contents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Design considerations 24.1 General requirements . 24.2 Specific requirements . 35 Performance requirements . 45.1 General . 45.2 Permissible deviations of
9、measuring devices 45.3 Mechanical strength of valve body assembly and components 45.3.1 Resistance to internal pressure . 45.3.2 Test methods . 55.4 Low pressure drain valve . 55.5 Hydraulic characteristics . 55.6 Vacuum relief valve . 65.7 Elevated temperature tests 65.8 Endurance . 65.8.1 Requirem
10、ents . 65.8.2 Tests 65.9 Acoustic test 66 Conformity assessment . 66.1 General . 66.2 Type tests . 76.3 Control of production process and quality system 77 Marking, technical documents, and packaging. 77.1 Marking . 77.2 Technical documents . 77.3 Packaging . 7Bibliography 8 ISO 2015 All rights rese
11、rved iiiBS ISO 13693-2:2015ISO 13693-2:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each memb
12、er 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-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Ele
13、ctrotechnical 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 the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types
14、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.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 hel
15、d 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 patent declarations received (see www.iso.org/patents).Any trade name used in this document is information
16、 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 information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the foll
17、owing URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 23, Tractors and machinery for agriculture and forestry, Subcommittee SC 18, Irrigation and drainage equipment and systems.ISO 13693 consists of the following parts, under the general title Irrigatio
18、n equipment Safety devices for chemigation: Part 1: Small plastics valves for chemington Part 2: Chemigation valve assemblies from DN 75 (3”) to DN 350 (14”)iv ISO 2015 All rights reservedBS ISO 13693-2:2015ISO 13693-2:2015(E)IntroductionChemigation is the practice of injecting chemicals into irriga
19、tion water for the purpose of distributing the chemicals onto crops. During the course of this activity, under certain hydraulic conditions, the chemicals being injected can migrate upstream into a well or other pressurized water supply and pollute that water source. A chemigation valve assembly has
20、 been developed to meet this need. The chemigation valve assembly is designed to meet the specific need and performance requirements as required to prohibit the migration of injected chemicals into irrigation wells, thereby polluting ground water supplies.This part of ISO 13693 applies to a mainline
21、 check valve assembly in sizes from DN 75 (3”) to DN 350 (14”), with related components, that is designed to permit full flow in the operational mode and stop backflow (back siphonage or back pressure) when the pipeline shuts down. The potential for backflow from back siphonage occurs as water tumbl
22、es back down the column pipe when the pump shuts down. The potential for backflow occurs when a positive pressure exists on the downstream end of the valve. The valve obturator is forced to the closed position by a pre-tensioned spring. A resilient cover on the obturator helps to seal the valve agai
23、nst very low pressures. This chemigation valve assembly is included in a technical report (to be written) that specifies a complete chemigation safety system. This system features a chemical tank (fertilizers and chemicals), a chemical pump (positive displacement or Venturi), check valves, and inter
24、locking safety shutdown controls. The system is designed to keep irrigation water from flooding the chemical tank and to shut the chemical system down when the irrigation pump shuts down or the irrigation system pressure has been reduced to a level where the injected chemical is not being uniformly
25、distributed to the field. The functional requirements of the chemigation valve could possibly be provided by valves of a different design. The valve is not designed for use in potable water systems. ISO 2015 All rights reserved vBS ISO 13693-2:2015BS ISO 13693-2:2015Irrigation equipment Safety devic
26、es for chemigation Part 2: Chemigation valve assemblies from DN 75 (3”) to DN 350 (14”)1 ScopeThis part of ISO 13693 specifies the construction and performance requirement and test methods for metal-bodied chemigation valves with water at temperatures not exceeding 50 C, which might contain fertiliz
27、ers and chemicals of the types and concentration used in agriculture.The valve is designed to prohibit backflow caused by either back pressure or back siphonage. It is not designed for use in potable water systems. It is not to be confused with other forms of backflow prevention devices including pr
28、essure vacuum breakers, double check valves, reduced pressure zone valves, or goose neck loops. This part of ISO 13693 specifies the minimum design, construction, and performance testing requirements for the chemigation valve assembly. The assembly consists of the following components: a valve body
29、into which a spring-loaded check valve is mounted with a resilient disk cover on the sealing surface; a combination air release/vacuum relief valve located upstream of the check valve; a low pressure drain valve located upstream of the check valve; an inspection port located so as to permit visual a
30、nd manual inspection of the valve working components.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edi
31、tion of the referenced document (including any amendments) applies.ISO 9635-1:2014, Agricultural irrigation equipment Irrigation valves Part 1: General requirementsEN 1267:1999, Industrial valves Test of flow resistance using water as a test fluid3 Terms and definitionsFor the purposes of this docum
32、ent, the following terms and definitions apply.3.1chemigation valvevalve featuring a chemical injection port and designed to prevent injected chemicals from moving upstream3.2check valvevalve which permits flow of water in one direction onlyINTERNATIONAL STANDARD ISO 13693-2:2015(E) ISO 2015 All rig
33、hts reserved 1BS ISO 13693-2:2015ISO 13693-2:2015(E)3.3air ventvacuum relief valvevalve which opens automatically to allow air from the atmosphere to enter a pipeline during drainage of the pipeline and/or venting of air to the atmosphere during pipeline filling3.4low pressure drain valvespring-load
34、ed valve which opens up at low pressure to provide drainage3.5chemical injection portthreaded port in a body of the chemigation valve to accommodate the injection of chemicals3.6inspection portport in the body of a chemigation valve to allow for the manual and visual inspection of its internal compo
35、nents3.7resilient coverelastomeric cover on the disk of a check valve3.8chemigation valve bodymain part of a chemigation valve through which water flows, which houses the internals of the valve and which allows for connection to the piping system4 Design considerations4.1 General requirementsThe val
36、ve is designed to prevent backflow of irrigation water that might contain fertilizers and other chemicals of the types and concentrations commonly used in pressurized agricultural irrigation systems. The valve is mounted in pipelines using a flange or other suitable connections. The valve must preve
37、nt backflow that results from both back siphonage and back pressure conditions present in the pipeline. See Figure 1.2 ISO 2015 All rights reservedBS ISO 13693-2:2015ISO 13693-2:2015(E)DOWNSTREAM UPSTREAMFigure 1 Cutaway drawing of a chemigation valve body assemblyKey1 valve body (metallic)2 threade
38、d connection3 manual drain port4 linkage mounting pin5 linkage mounting bolt6 linkage mounting frame7 spring8 check valve resilient sealing surface9 female coupling10 gasket11 male coupling to mount the air vent/vacuum relief valve12 threaded connection to mount the low pressure drain valve13 thread
39、ed port to mount the pressure gauge (optional)4.2 Specific requirementsChemigation valve assemblies shall be designed in accordance with the following requirements.a) Valve ends shall be designed for ease of installation and removal in piping systems and provide for a watertight sealing of the conne
40、cting joints.b) The check valve assembly shall provide for full flow in the open position and a watertight seal in the reverse flow direction.c) The air vent/vacuum relief valve shall function as an air vent on pump start-up and as a vacuum relief valve when the pump is shut down. ISO 2015 All right
41、s reserved 3BS ISO 13693-2:2015ISO 13693-2:2015(E)d) The low pressure drain valve shall open at atmospheric pressure and remain open until the pump is started and a minimum pressure of 15 kPa has been reached.e) The inspection port shall be attached to the valve body mechanically (hand removable) to
42、 accommodate the internal pressure test without leakage. The inspection port shall have a minimum open clearance of 115 mm and allow for manual and visual inspection of the check valve seat and resilient sealing surface.f) The injection port shall be located downstream of the check valve and be desi
43、gned to facilitate complete mixing of the added chemicals with the irrigation water and minimize the contact between the chemicals and the valve body.g) All functioning components shall be removable for inspection or replacement.h) The valve shall have a stated maximum flow rate based on limiting th
44、e average velocity through the valve body to 3,0 m/s. The average flow rate shall be calculated for a pipe of equivalent size.i) The valve body and components shall be designed to resist chemical attack.j) The low pressure drain valve shall have a nominal body internal flow passage diameter not less
45、 than 15 mm.Chemigation valves shall be designed in accordance with additional requirements given in ISO 9635-1:2014, Clause 4.5 Performance requirements5.1 GeneralPerformance tests shall be carried out on the valve assembly in accordance with the manufacturers technical documents.5.2 Permissible de
46、viations of measuring devicesIn the absence of any particular specification, the accuracy of measurements shall be as follows: flow rate and pressure 2 % of the specified value; temperature: 23 C 5 C; time: 1 % of the specified value.The measuring devices shall be calibrated according to the existin
47、g calibration rules in the country concerned.5.3 Mechanical strength of valve body assembly and components5.3.1 Resistance to internal pressurea) For test method 5.3.2 d) only, the chemigation valve assembly shall be tested in the horizontal and vertical (inlet flange up) position. Neither visual pe
48、rmanent deformation nor rupture of the body, internal components, or assembled components shall occur. The pressure tests defined by 5.3.2 c) and d) shall result in a leakage rate no greater than 0,3 ml/min. During pressure testing, water must be introduced slowly to limit pressure surges.Neither vi
49、sual permanent deformation nor rupture of the body, internal components, or assembled components shall occur.4 ISO 2015 All rights reservedBS ISO 13693-2:2015ISO 13693-2:2015(E)5.3.2 Test methodsa) Prepare the valve assembly by plugging the injection port (2), installing the low pressure drain valve (12), the air vent/vacuum relief valve, and male coupling clamping ring. Fit the valve assembly with blind flanges mating to the inlet and outlet flanges. Subject the valve assembly to a pressure of 1 MPa for a period o
