ISO 24649:2022

INTERNATIONAL ISO
STANDARD 24649
First edition
2022-02
Agricultural irrigation equipment —
Manually and hydraulically operated
plastics valves
Matériel agricole d'irrigation — Vannes en matière plastique à
commande manuelle par des actionneurs hydrauliques
Reference number
© ISO 2022
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ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Technical characteristics .3
4.1 General . 3
4.2 Dimensions . 3
4.3 Connections to pipeline . 3
4.4 Handwheel or handle . 4
4.5 Specific construction requirements for globe, oblique and angle valves . 4
4.5.1 Threaded valve stems . 4
4.5.2 Disc facing ring . 4
4.6 Specific construction requirements for ball valves . 4
5 Mechanical and functional tests . 5
5.1 General . 5
5.2 Operating torque . 5
5.2.1 General . 5
5.2.2 Closing torque . 5
5.2.3 Resistance to increased torque . 5
5.3 Pressure loss . 6
5.4 Resistance of valve and valve material to internal hydrostatic pressure . 6
5.5 Seat and stem sealing test . 6
5.5.1 Seat test for manually operated valves . 6
5.5.2 Seat test for hydraulically operated valves . 6
5.5.3 Stem sealing test . 7
5.6 Valve performance at increased hydraulic pressure . 7
5.7 Endurance testing . 7
6 Sampling and acceptance requirements . 8
6.1 Type-tests . 8
6.2 Acceptance tests. 8
7 Marking . . 8
Annex A (normative) Resistance of valve and valve material to hydrostatic pressure .10
Bibliography .13
iii
Foreword
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bodies (ISO member bodies). The work of preparing International Standards is normally carried out
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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
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www.iso.org/iso/foreword.html.
This document 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 24649 cancels and replaces ISO 9911:2006, which has been technically revised.
The main changes are as follows:
— the scope was extended to include hydraulically operated plastics valves in addition to operated
plastics valves.
Any feedback or questions on this document should be directed to the user’s national standards body.
A complete listing of these bodies can be found at www.iso.org/members.html.
iv
INTERNATIONAL STANDARD ISO 24649:2022(E)
Agricultural irrigation equipment — Manually and
hydraulically operated plastics valves
1 Scope
This document specifies the general requirements and test methods for manually operated and
hydraulically operated plastics valves intended for use in agricultural irrigation systems.
It is applicable to manually operated and hydraulically operated plastics valves (as indicated in
Table A.2) of nominal sizes DN 8 (1/4") to DN 200 (8").
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances
and designation
ISO 48-2, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 2: Hardness between
10 IRHD and 100 IRHD
ISO 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 815-1, Rubber, vulcanized or thermoplastic — Determination of compression set — Part 1: At ambient
or elevated temperatures
ISO 2859-1:1999, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by
acceptance quality limit (AQL) for lot-by-lot inspection
ISO 5752, Metal valves for use in flanged pipe systems — Face-to-face and centre-to-face dimensions
ISO 7005-1, Pipe flanges — Part 1: Steel flanges for industrial and general service piping systems
ISO 8233, Thermoplastics valves — Torque — Test method
ISO 9624, Thermoplastics piping systems for fluids under pressure — Flange adapters and loose backing
flanges — Mating dimensions
ISO 9644, Agricultural irrigation equipment — Pressure losses in irrigation valves — Test method
3 Terms and definitions
For the purposes of this document, the following terms and definitions.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
body
main component of the valve which houses functioning components, provides the fluid flow
passageways and the connection ends
3.2
seat
part of the obturator (3.10) which provides the obturator sealing surface that can be an integral or a
separate component
3.3
nominal pressure
PN
numerical designation equal to the maximum working pressure specified by the manufacturer at which
a device will continuously operate
3.4
nominal size
numerical designation used to refer to the size of the device end connections which is identical to the
numerical nominal diameter of the pipe or pipes to which the device is to be connected directly
3.5
angle valve
valve with a generally cylindrical body for which the body (3.1) ends are in planes perpendicular to
each other and having a stem (3.13) the axis of which is colinear with the axis passing through the
centre of one of the body ends
3.6
ball valve
valve in which a ball can be turned to move its port, or ports, relative to the ports in the valve body
(3.1), to control the flow of water
3.7
globe valve
valve with a generally cylindrical body (3.1) in which the axes of the body ends are co-linear and in
which the axis of the stem (3.13) is perpendicular to the axes of the body ends
3.8
oblique valve
valve in which the axes of the body (3.1) ends are co-linear and in which the axis of the stem (3.13) is
oblique to the axes of the body ends
3.9
closing disc
part of an obturator (3.10) of any shape on which the disc face (3.11) is formed and to which the disc
facing ring (3.12), if used, is secured
3.10
obturator
moving member in a valve that operates to close the valve and, where applicable, contains a washer or
similar sealing device
3.11
disc face
sealing surface of the obturator (3.10) in a valve which contacts the valve seat (3.2) when the valve is in
the closed position
3.12
disc facing ring
ring, of material different from that of the closing disc (3.9), secured to the disc and used to ensure
water tightness when the valve is closed
3.13
stem
component of an obturator (3.10) on which the actuating thread is formed and by which control of the
closing component is affected
3.14
closing torque
minimum torque required to achieve full tightness of a manually operated device at nominal pressure
(3.3)
3.15
shell test
test intended to check the design strength of a valve body (3.1) under internal hydrostatic pr
...