ISO 9635-2:2006

INTERNATIONAL ISO
STANDARD 9635-2
First edition
2006-11-15


Agricultural irrigation equipment —
Irrigation valves —
Part 2:
Isolating valves
Matériel agricole d'irrigation — Vannes d'irrigation —
Partie 2: Vannes d'isolation





Reference number
ISO 9635-2:2006(E)
©
ISO 2006

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ISO 9635-2:2006(E)
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ii © ISO 2006 – All rights reserved

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ISO 9635-2:2006(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 and air-tightness. 4
5.3 Hydraulic characteristics . 5
5.4 Resistance to chemicals and fertilizers. 5
5.5 Endurance . 6
6 Conformity assessment . 6
6.1 General. 6
6.2 Type tests . 6
6.3 Control of production process and quality system . 6
7 Marking . 6
8 Packaging . 6
Annex A (normative) Test method for resistance of valves to operating loads. 8
Annex B (normative) Torque requirements for gate valves to be operated by ring key and bar . 9
Annex C (normative) Test method for operation of valves. 10
Annex D (normative) Test method for endurance of valves. 11
Annex E (normative) Method for sizing operating element . 12
Bibliography . 15

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ISO 9635-2:2006(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 9635-2 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 9635-2, together with ISO 9635-1, ISO 9635-3, ISO 9635-4 and ISO 9635-5, 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

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INTERNATIONAL STANDARD ISO 9635-2:2006(E)

Agricultural irrigation equipment — Irrigation valves —
Part 2:
Isolating valves
1 Scope
This part of ISO 9635 specifies construction and performance requirements and test methods for isolating
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 isolating irrigation valves of DN 8 (1/4 inch) 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 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 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
isolating valve
valve intended for use only in the fully closed or fully open position
[EN 736-1]
3.2
full bore valve
valve with a seat diameter of not less than 90 % of the internal diameter of the body end port
[EN 736-3]
3.3
clear way valve
valve designed to have an unobstructed flow path which allows the passage of a theoretical sphere with a
diameter which is not less than the inside diameter of the body end port
[EN 736-3]
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ISO 9635-2:2006(E)
3.4
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.
4 Design requirements
Isolating valves shall be designed in accordance with the requirements given in clause 4 of ISO 9635-1.
5 Performance requirements
All tests are to be performed on the valve as it was delivered to the test facility.
5.1 Mechanical strength
5.1.1 Resistance to internal pressure of shell and all pressure-containing components
Requirements and testing shall be in accordance with ISO 9635-1:2006, 5.1.1.
5.1.2 Resistance of obturator to differential pressure
Requirements and testing shall be in accordance with ISO 9635-1:2006, 5.1.2.
Except for valves to be used for a single flow direction, the test shall be performed successively in each flow
direction.
5.1.3 Resistance of valve to bending
The requirement and testing shall be in accordance with ISO 9635-1:2006, 5.1.3.
The bending moment, M, to be applied during the test shall be in accordance with Table 1, as a function of
DN.
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ISO 9635-2:2006(E)
Table 1 — Bending moments
Bending moment
DN M
N ⋅ m
8 610
10 615
20 640
25 670
32 730
40 825
50 1 050
65 1 400
80 1 500
100 2 200
125 3 200
150 4 800
200 7 200
250 11 000
300 15 000
350 19 000
400 24 000
450 28 000
500 33 000

5.1.4 Resistance of valves to operating loads
Requirements shall be in accordance with ISO 9635-1:2006, 5.1.4.
In order to verify this requirement, the valve shall be tested in accordance with Annex A, with the application of
a closing torque and an opening torque equal to the minimum strength torque (mST), following which it shall
pass the operating tests in accordance with 5.2.3, and the seat tightness tests in accordance with 5.2.2.1 and
5.2.2.2.
The mST shall be equal to twice the maximum operating torque (MOT) given in 5.2.3. In the case of gate
valves as specified in 5.2.3 c), the mST to be applied in the test in accordance with Annex A shall be equal to
5 × MOT. In the case of valves as specified in 5.2.3 d), the test is only applicable when there is an additional
manual operating element.
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ISO 9635-2:2006(E)
5.2 Watertightness and air-tightness
5.2.1 Watertightness and air-tightness of shell and all pressure-containing components
5.2.1.1 Internal pressure
Requirements and testing shall be in accordance with ISO 9635-1:2006, 5.2.1.1.
5.2.1.2 External pressure
Requirements and testing shall be in accordance with ISO 9635-1:2006, 5.2.1.2.
5.2.2 Seat tightness
5.2.2.1 Seat tightness at high differential pressure
Requirements and testing shall be in accordance with ISO 9635-1:2006, 5.2.2.1.
After closing the valve by application of MOT (see 5.2.3), the leakage rate shall be rate A for resilient seated
valves and shall not exceed rate B for metallic seated valves. For a type test, the test duration shall not be
less than 10 min.
Except for valves to be used in a single flow direction, the test shall be performed successively in each flow
direction.
5.2.2.2 Seat tightness at low differential pressure
Requirements and testing shall be in accordance with ISO 9635-1:2006, 5.2.2.2
After closing the valve by application of MOT (see 5.2.3), the leakage rate shall be rate A for resilient seated
valves and shall not exceed rate B for metallic seated valves. For a type test, the test duration shall not be
less than 10 min.
Except for valves to be used in a single flow direction, the test shall be performed successively in each flow
direction.
5.2.3 MOT for operation and watertightness and air-tightness
In order to verify this requirement, an isolating valve shall be tested in accordance with Annex C. The
measured torque shall not exceed the MOT as specified in a) to d) below.
a) Valves delivered with their operating element
⎯ In the case of a hand wheel:
MOT = 0,5 × F × D
expressed in newton metres (N ⋅ m),
where
F is the maximum operating manual force (F refers to operating the valve, F to seating and
max
unseating the valve, see Annex E), expressed in newtons (N);
D is the diameter of the hand wheel, in metres (m).
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