ISO 9635-5:2014

INTERNATIONAL ISO
STANDARD 9635-5
Second edition
2014-12-01
Agricultural irrigation equipment —
Irrigation valves —
Part 5:
Control valves
Matériel agricole d’irrigation — Vannes d’irrigation —
Partie 5: Vannes de contrôle
Reference number
ISO 9635-5:2014(E)
©
ISO 2014

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ISO 9635-5:2014(E)

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© ISO 2014
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ISO 9635-5:2014(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 . 5
5.4 Resistance to chemicals and fertilizers . 5
5.5 Endurance . 5
6 Conformity assessment . 5
6.1 General . 5
6.2 Type tests . 6
6.3 Control of production process and quality system . 6
7 Marking . 7
8 Packaging . 7
Annex A (normative) Test method for hydraulic characteristics of control valves providing
flow regulation function . 8
Annex B (normative) Test method for hydraulic characteristics of control valves providing
pressure regulation function . 9
Annex C (normative) Test method for hydraulic characteristics of control valves providing
level regulation .11
Annex D (normative) Test method for endurance of control valves .12
Bibliography .13
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ISO 9635-5:2014(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.
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 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 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 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 expressions related to conformity
assessment, as well as information about ISO’s 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 Technical Committee ISO/TC 23, Tractors and machinery
for agriculture and forestry, Subcommittee SC 18, Irrigation and drainage equipment and systems.
This second edition cancels and replaces the first edition (ISO 9635-5:2006), 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: Isolating valves
— Part 3: Check valves
— Part 4: Air valves
— Part 5: Control valves
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INTERNATIONAL STANDARD ISO 9635-5:2014(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). These valves can also function as
check valves.
2 Normative references
The 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 edition of the referenced document (including any amendments) applies.
ISO 9635-1:2014, Agricultural irrigation equipment — Irrigation valves — Part 1: General requirements
ISO 9635-2:2014, 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 1 to entry: The functions are flow rate, water level, and pressure control (upstream or downstream). The
valves are also used to start or terminate irrigation system operation.
3.1.1
autonomous control valve
control valve (3.1) that uses the energy from the conveyed water to adjust the position of the obturator
for the regulation of a specific function
3.1.2
non-autonomous control valve
control valve (3.1) that requires external power to adjust the position of the obturator for the regulation
of a specific function
3.1.3
pressure-reducing valve
control valve (3.1) that reduces a higher inlet pressure to a constant lower outlet pressure regardless of
variations in the flow rate or variations of the inlet pressure
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ISO 9635-5:2014(E)

3.1.4
pressure-sustaining valve
control valve (3.1) that maintains a constant pressure at the inlet regardless of variations in the flow rate
or variations in the outlet pressure
3.2
flow coefficient
K
v
number equal to the flow rate of water, in cubic metres per hour, that will flow through a fully open valve
with a 100 kPa pressure loss across the valve
3
Note 1 to entry: QK= Δp , where Q is the flow rate in cubic metres per hour (m /h), and Δp is the pressure in
v
bar.
2
Note 2 to entry: 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm .
Note 3 to entry: Adapted from EN 736–3.
3.3
maximum differential pressure
highest differential pressure of the control valve in operation
Note 1 to entry: It is a value given by the manufacturer.
4 Design requirements
Control valves shall be designed in accordance with ISO 9635-1:2014, Clause 4.
Control valves designed to control pressure or water level shall be tightly seated when closed (see
ISO 9635-1:2014, 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
Perform all tests 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
Carry out testing in accordance with ISO 9635-1:2014, 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 (for example,
isolating valves of the control system), in order to protect that feature during the test.
Test the features protected by these means to the pressure given in ISO 9635-1:2014, 5.1.2.
Test results shall comply with the requirements of ISO 9635-1:2014, 5.1.1.
5.1.2 Resistance of obturator to differential pressure
The valve shall comply with the requirement and test in ISO 9635-1, 5.1.2.
If a control valve is designed not to seat tightly, the requirement and test for the obturator shall be
modified as follows: the differential pressure which the obturator shall withstand shall be the lower of
(1,5 × PM) bar and (PM + 5) bar where PM is the maximum differential pressure of the control valve in
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