ISO 9635-4:2014
(Main)Agricultural irrigation equipment — Irrigation valves — Part 4: Air valves
Agricultural irrigation equipment — Irrigation valves — Part 4: Air valves
ISO 9635-4:2014 specifies construction and performance requirements and test methods for 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 greater, 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.
Matériel agricole d'irrigation — Vannes d'irrigation — Partie 4: Vannes de purge d'air
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 9635-4
Second edition
2014-11-15
Agricultural irrigation equipment —
Irrigation valves —
Part 4:
Air valves
Matériel agricole d’irrigation — Vannes d’irrigation —
Partie 4: Vannes de purge d’air
Reference number
ISO 9635-4:2014(E)
©
ISO 2014
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ISO 9635-4:2014(E)
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ii © ISO 2014 – All rights reserved
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ISO 9635-4:2014(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 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 and quality system . 5
7 Marking . 6
8 Packaging . 6
Annex A (normative) Test method for airflow characteristics of valves with air release function .7
Annex B (normative) Test method for airflow characteristics of valves with air intake function .9
Annex C (normative) Test method for endurance of valves with air intake and/or air
release functions .12
Bibliography .14
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ISO 9635-4:2014(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 (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 (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 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 9635-4:2006) 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: Isolating valves
— Part 3: Check valves
— Part 4: Air valves
— Part 5: Control valves
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INTERNATIONAL STANDARD ISO 9635-4:2014(E)
Agricultural irrigation equipment — Irrigation valves —
Part 4:
Air valves
1 Scope
This part of ISO 9635 specifies construction and performance requirements and test methods for 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 greater, 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 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
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 9635-1:2014 and the following
apply.
3.1
air valve
float-type purger
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 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
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ISO 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 9635-2:2014.
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 valves, 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 resistance 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 Watertightness 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
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
obturators may be tested simultaneously or separately.
Test results shall comply with the requirements of ISO 9635-1:2014, 5.3.2.1.
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ISO 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, 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 operating 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 Airflow characteristics
Test results shall comply with the requirements of ISO 9635-1:2014, 5.4.
The characteristics 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
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 ou
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