ISO 9635-5:2006

INTERNATIONAL ISO
STANDARD 9635-5
First edition
2006-11-15


Agricultural irrigation equipment —
Irrigation valves —
Part 5:
Control valves
Matériel agricole d'irrigation — Vannes d'irrigation —
Partie 5: Vannes de contrôle





Reference number
ISO 9635-5:2006(E)
©
ISO 2006

---------------------- Page: 1 ----------------------
ISO 9635-5:2006(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.


©  ISO 2006
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland

ii © ISO 2006 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 9635-5:2006(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Design requirements . 2
5 Performance requirements . 2
5.1 Mechanical strength . 2
5.2 Watertightness . 4
5.3 Hydraulic characteristics . 4
5.4 Resistance to chemicals and fertilizers. 5
5.5 Endurance . 5
6 Conformity assessment . 5
6.1 General. 5
6.2 Type tests . 5
6.3 Control of production process and quality system . 5
7 Marking . 6
8 Packaging . 6
Annex A (normative) Test method for hydraulic characteristics of control valves providing flow
regulation function . 7
Annex B (normative) Test method for hydraulic characteristics of control valves providing
pressure regulation function . 8
Annex C (normative) Test method for hydraulic characteristics of control valves providing level
regulation. 9
Annex D (normative) Test method for endurance of control valves. 10
Bibliography . 11

© ISO 2006 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO 9635-5:2006(E)
Foreword
ISO (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 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-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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 9635-5 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and
forestry, Subcommittee SC 18, Irrigation and drainage equipment and systems.
This first edition of ISO 9635-5, together with ISO 9635-1, ISO 9635-2, ISO 9635-3 and ISO 9635-4, cancels
and replaces ISO 9635:1990, of which it constitutes a technical revision.
ISO 9635 consists of the following parts, under the general title Agricultural irrigation equipment — Irrigation
valves:
⎯ Part 1: General requirements
⎯ Part 2: Isolating valves
⎯ Part 3: Check valves
⎯ Part 4: Air valves
⎯ Part 5: Control valves

iv © ISO 2006 – All rights reserved

---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 9635-5:2006(E)

Agricultural irrigation equipment — Irrigation valves —
Part 5:
Control valves
1 Scope
This part of ISO 9635 specifies construction and performance requirements and test methods for control
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 control irrigation valves of DN 15 (1/2 inch) diameter or greater,
designed to operate in any position, from fully open to fully closed. The valves can either be directly operated
(i.e. the force applied via a spring or diaphragm to the obturator), or pilot-operated (i.e. the force is applied
through an adjustable pilot valve via a diaphragm).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 9635-1:2006, Agricultural irrigation equipment — Irrigation valves — Part 1: General requirements
ISO 9635-2:2006, Agricultural irrigation equipment — Irrigation valves — Part 2: Isolating valves
ISO 9644, Agricultural irrigation equipment — Pressure losses in irrigation valves — Test method
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 9635-1 and the following apply.
3.1
control valve
device intended to regulate, within specified limits, one or more functions
NOTE The functions are flow rate, water level control and pressure (upstream or downstream).
3.1.1
autonomous control valve
control valve having the integral capability of controlling the function using energy from the conveyed water by
adjusting the position of the obturator
3.1.2
non-autonomous control valve
valve that requires external power in order to regulate the specified function
© ISO 2006 – All rights reserved 1

---------------------- Page: 5 ----------------------
ISO 9635-5:2006(E)
3.1.3
pressure-reducing valve
control valve that reduces higher inlet pressure to a lower and outlet pressure regardless of variations in the
flow rate or variations of the inlet pressure
3.1.4
pressure-sustaining valve
control valve that maintains a constant pressure at the inlet regardless of variations in the flow rate or
variations of the outlet pressure
3.2
flow coefficient
K

v
coefficient equal to the flow rate, in cubic metres per hour, of water at a temperature between 5 °C and 50 °C,
passing through the valve and causing a loss of static head of 1 bar
3
NOTE 1 QK=∆p , where Q is the flow rate in cubic metres per hour (m /h), and p is the pressure in kilopascals per
v
2
square centimetre (kPa/cm ).
5 2

NOTE 2 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
NOTE 3 Adapted from EN 736-3.
3.3
maximum differential pressure
PM
maximum differential pressure of the control valve in operation
NOTE It is a value given by the manufacturer.
4 Design requirements
Control valves shall be designed in accordance with ISO 9635-1:2006, Clause 4.
Control valves designed to control pressure or level shall be tightly seated when closed (see
ISO 9635-1:2006,Table G.2, Rate A).
The manufacturer shall indicate in the relevant technical documentation the working limits of the valve and any
special conditions for installation and commissioning.
5 Performance requirements
All tests are to be performed on the valve as delivered to the test facility.
5.1 Mechanical strength
5.1.1 Resistance of shell and all pressure-containing components to internal pressure
Requirements and testing shall be in accordance with ISO 9635-1:2006, 5.1.1.
If the manufacturer indicates that any feature of the control valve is not designed to withstand a high pressure,
the technical documentation shall indicate the appropriate means to be used (e.g. isolating valves of the
control system), in order to protect them during the test.
The features protected by these means shall be tested to the pressure given in ISO 9635-1:2006, 5.1.2.
2 © ISO 2006 – All rights reserved

---------------------- Page: 6 ----------------------
ISO 9635-5:2006(E)
5.1.2 Resistance of obturator to differential pressure
The valve shall comply with the requirement and test of ISO 9635-1:2006, 5.1.2.
If a control valve does not seat tightly, the requirement and test for the obturator shall be modified such that
the differential pressure that the obturator can withstand is the lower of
...