ISO 9635-1:2014

INTERNATIONAL ISO
STANDARD 9635-1
Second edition
2014-11-15
Agricultural irrigation equipment —
Irrigation valves —
Part 1:
General requirements
Matériel agricole d’irrigation — Vannes d’irrigation —
Partie 1: Exigences générales
Reference number
©
ISO 2014
© ISO 2014
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ii © ISO 2014 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Design requirements . 3
4.1 Materials . 3
4.2 DN . 3
4.3 Pressures . 3
4.4 Temperatures . 4
4.5 Design of shell and obturator . 4
4.6 End types and interchangeability . 4
4.7 Operating direction . 4
4.8 Maximum water velocity . 5
4.9 Valve parts . 5
4.10 Internal corrosion and ageing resistance . 5
4.11 External corrosion and ageing resistance . 5
4.12 Repairs and maintenance . 5
5 Performance requirements . 5
5.1 General . 5
5.2 Mechanical strength . 6
5.3 Watertightness . 6
5.4 Hydraulic characteristics . 7
5.5 Resistance to chemicals and fertilizers . 7
5.6 Endurance test . 7
6 Conformity assessment . 8
6.1 General . 8
6.2 Type tests . 8
6.3 Control of production process and quality system . 8
7 Marking . 8
8 Packaging . 9
Annex A (normative) Test method for resistance to internal pressure of shell and all
pressure-containing components .10
Annex B (normative) Test method for resistance of obturator to differential pressure .11
Annex C (normative) Test method for resistance of valves to bending .13
Annex D (normative) Minimal test method for watertightness to external pressure of shell
and all pressure-containing components .15
Annex E (normative) Test method for resistance to chemicals and fertilizers
.....................................................16
Annex F (normative) Test method for water or air tightness of valve body .17
Annex G (normative) Test method for seat tightness .19
Bibliography .23
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 9635-1:2006), 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
iv © ISO 2014 – All rights reserved

INTERNATIONAL STANDARD ISO 9635-1:2014(E)
Agricultural irrigation equipment — Irrigation valves —
Part 1:
General requirements
1 Scope
This part of ISO 9635 specifies construction and performance requirements and test methods for 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 irrigation valves of 8 mm diameter or greater, designed to operate in the fully open and
fully closed positions, but which can also operate for extended time periods in any intermediate position.
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 4633, Rubber seals — Joint rings for water supply, drainage and sewerage pipelines — Specification
for materials
ISO 5209, General purpose industrial valves — Marking
ISO 5752, Metal valves for use in flanged pipe systems — Face-to-face and centre-to-face dimensions
ISO 6708:1995, Pipework components — Definition and selection of DN (nominal size)
ISO 7005-1, Pipe flanges — Part 1: Steel flanges for industrial and general service piping systems
ISO 7005-2, Metallic flanges — Part 2: Cast iron flanges
ISO 7005-3, Metallic flanges — Part 3: Copper alloy and composite flanges
ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests
ISO 9635-2:2014, Agricultural irrigation equipment — Irrigation valves — Part 2: Isolating valves
ISO 9635-5:2014, Agricultural irrigation equipment — Irrigation valves — Part 5: Control valves
ISO 9644, Agricultural irrigation equipment — Pressure losses in irrigation valves — Test method
ISO 9911:2006, Agricultural irrigation equipment — Manually operated small plastics valves
ISO 9080, Plastics piping and ducting systems — Determination of the long-term hydrostatic strength of
thermoplastics materials in pipe form by extrapolation
EN 681-1, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage
applications — Part 1: Vulcanized rubber
EN 12627, Industrial valves — Butt welding ends for steel valves
EN 12982, Industrial valves — End-to-end and centre-to-end dimensions for butt welding end valves
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
maximum operating torque
MOT
fixed upper limit for the torque which, when applied at the shaft, operates the valve and ensures
compliance with the required leakage rate
3.2
minimum strength torque
mST
fixed lower limit for the torque which, when applied at the shaft, with the obturator either totally open
or totally closed, causes no alteration to the functional capability of the valve
3.3
shaft
component of an obturator on which the actuating thread is formed and by which control of the closing
component is effected
3.4
type test
test to prove that the design of a valve meets the general and specific performance requirements of the valve
3.5
operating mechanism
mechanism which translates the motion of the operating device to the motion of the obturator
[SOURCE: EN 736-2]
3.6
operating device
manual or power-operated device used to operate the non-pressurized valve
[SOURCE: EN 736-2]
3.7
operating element
component of the operating device by which the mechanical power is introduced
[SOURCE: EN 736-2]
3.8
nominal diameter
DN
parameter used fo
...