SIST EN ISO 14723:2009

SLOVENSKI STANDARD
01-september-2009
1DGRPHãþD
SIST EN ISO 14723:2004
Industrija nafte in zemeljskega plina - Transportni cevovodni sistemi - Armature
podvodnih cevovodov (ISO 14723:2009)
Petroleum and natural gas industries - Pipeline transportation systems - Subsea pipeline
valves (ISO 14723:2009)
Erdöl- und Erdgasindustrie - Rohrleitungstransportsysteme - Unterwasserarmaturen (ISO
14723:2009)
Industries du pétrole et du gaz naturel - Systèmes de transport par conduites - Vannes
de conduites immergées (ISO 14723:2009)
Ta slovenski standard je istoveten z: EN ISO 14723:2009
ICS:
23.060.01 Ventili na splošno Valves in general
75.200 2SUHPD]DVNODGLãþHQMH Petroleum products and
QDIWHQDIWQLKSURL]YRGRYLQ natural gas handling
]HPHOMVNHJDSOLQD equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 14723
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2009
ICS 75.200 Supersedes EN ISO 14723:2001
English Version
Petroleum and natural gas industries - Pipeline transportation
systems - Subsea pipeline valves (ISO 14723:2009)
Industries du pétrole et du gaz naturel - Systèmes de Erdöl- und Erdgasindustrie - Rohrleitungstransportsysteme
transport par conduites - Vannes de conduites immergées - Unterwasserarmaturen (ISO 14723:2009)
(ISO 14723:2009)
This European Standard was approved by CEN on 20 May 2009.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 14723:2009: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (EN ISO 14723:2009) has been prepared by Technical Committee ISO/TC 67 "Materials,
equipment and offshore structures for petroleum, petrochemical and natural gas industries" in collaboration
with Technical Committee CEN/TC 12 “Materials, equipment and offshore structures for petroleum,
petrochemical and natural gas industries” the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by December 2009, and conflicting national standards shall be withdrawn
at the latest by December 2009.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 14723:2001.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 14723:2009 has been approved by CEN as a EN ISO 14723:2009 without any modification.

INTERNATIONAL ISO
STANDARD 14723
Second edition
2009-06-15
Petroleum and natural gas industries —
Pipeline transportation systems —
Subsea pipeline valves
Industries du pétrole et du gaz naturel — Systèmes de transport par
conduites — Vannes de conduites immergées

Reference number
ISO 14723:2009(E)
©
ISO 2009
ISO 14723:2009(E)
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©  ISO 2009
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
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Published in Switzerland
ii © ISO 2009 – All rights reserved

ISO 14723:2009(E)
Contents Page
Foreword. v
Introduction . vi
1 Scope . 1
2 Conformance. 1
2.1 Rounding . 1
2.2 Compliance to standard. 1
3 Normative references . 1
4 Terms and definitions. 3
5 Symbols and abbreviated terms . 8
5.1 Symbols . 8
5.2 Abbreviated terms . 8
6 Valve types and configurations. 9
6.1 Valve types . 9
6.2 Valve configurations. 10
7 Design . 25
7.1 Design codes and calculations . 25
7.2 Pressure and temperature ratings . 25
7.3 Cavity relief. 26
7.4 External pressure and loads. 26
7.5 Sizes. 26
7.6 Face-to-face and end-to-end dimensions. 26
7.7 Valve operation . 36
7.8 Pigging. 36
7.9 Valve ends . 37
7.10 Bypasses, drains and vents . 38
7.11 Manual actuator-manual operator — Handwheels and wrenches. 38
7.12 Locking devices . 39
7.13 Position of the obturator. 39
7.14 Position indicators. 39
7.15 Travel stops. 39
7.16 ROV interface . 39
7.17 Sealant injection . 39
7.18 Lifting points and supports . 40
7.19 Valve operator interface. 40
7.20 Drive trains . 41
7.21 Stem retention. 41
7.22 Stem/shaft protector. 41
7.23 Hydraulic lock . 42
7.24 Corrosion/erosion. 42
7.25 Hyperbaric performance . 42
7.26 Design documents. 42
7.27 Design document review . 42
8 Materials . 42
8.1 Material specification . 42
8.2 Service compatibility. 43
8.3 Forged parts . 43
8.4 Composition limits. 43
8.5 Impact test requirements of steels . 44
ISO 14723:2009(E)
8.6 Bolting. 45
8.7 Sour service. 45
9 Welding . 45
9.1 Qualifications. 45
9.2 Impact testing requirements of weldments. 46
9.3 Hardness testing . 47
9.4 Repair . 47
10 Quality control. 48
10.1 NDE requirements. 48
10.2 Measuring and test equipment . 48
10.3 Qualification of inspection and test personnel. 49
10.4 NDE. 49
10.5 NDE of repairs . 49
10.6 Visual inspection of castings. 50
11 Testing. 50
11.1 General . 50
11.2 Hydrostatic shell test. 50
11.3 Operational/functional test. 51
11.4 Hydrostatic seat test. 51
11.5 Cavity-relief test . 52
11.6 Low-pressure-gas seat test. 52
11.7 Draining. 53
11.8 Installation of body connections after testing . 53
12 Coating. 53
13 Marking. 53
14 Preparation for shipment . 55
15 Documentation . 55
15.1 Documentation retained by manufacturer. 55
15.2 Documentation shipped with valve. 56
Annex A (normative) Requirements for non-destructive examination . 57
Annex B (normative) Supplementary test requirements. 60
Annex C (informative) Supplementary documentation requirements. 65
Annex D (informative) Purchasing guidelines . 66
Annex E (informative) Marking example . 71
Bibliography . 72

iv © ISO 2009 – All rights reserved

ISO 14723:2009(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 14723 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures
for petroleum, petrochemical and natural gas industries, Subcommittee SC 2, Pipeline transportation systems.
This second edition cancels and replaces the first edition (ISO 14723:2001), which has been technically
revised.
ISO 14723:2009(E)
Introduction
This International Standard is based on ISO 14313. It has been developed to address special requirements
specific to subsea pipeline valves.
It is necessary that users of this International Standard be aware that further or differing requirements can be
required for individual applications. This International Standard is not intended to inhibit a contractor from
offering, or the company from accepting, alternative engineering solutions for the individual application. This
can be particularly applicable where there is innovative or developing technology. Where an alternative is
offered, it is the responsibility of the manufacturer to identify any variations from this International Standard
and provide details.
vi © ISO 2009 – All rights reserved

INTERNATIONAL STANDARD ISO 14723:2009(E)

Petroleum and natural gas industries — Pipeline transportation
systems — Subsea pipeline valves
1 Scope
This International Standard specifies requirements and gives recommendations for the design, manufacturing,
testing and documentation of ball, check, gate and plug valves for subsea application in offshore pipeline
systems meeting the requirements of ISO 13623 for the petroleum and natural gas industries.
This International Standard is not applicable to valves for pressure ratings exceeding PN 420 (Class 2500).
2 Conformance
2.1 Rounding
Except as otherwise required by this International Standard, to determine conformance with the specified
requirements, observed or calculated values shall be rounded to the nearest unit in the last right-hand place of
figures used in expressing the limiting value, in accordance with the rounding method of ISO 31-0:1992,
Annex B, Rule A.
2.2 Compliance to standard
A quality system should be applied to assist compliance with the requirements of this International Standard.
NOTE ISO/TS 29001 gives sector-specific guidance on quality management systems.
The manufacturer shall be responsible for complying with all of the applicable requirements of this
International Standard. It shall be permissible for the purchaser to make any investigation necessary in order
to be assured of compliance by the manufacturer and to reject any material that does not comply.
3 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 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances
and designation
ISO 31-0:1992, Quantities and Units — Part 0: General Principles
ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method
ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,
tolerances and designation
ISO 5208:2008, Industrial valves — Pressure testing of metallic valves
ISO 14723:2009(E)
ISO 9606 (all parts), Qualification test of welders — Fusion welding
ISO 9712, Non-destructive testing — Qualification and certification of personnel
ISO 10474, Steel and steel products — Inspection documents
ISO 15156 (all parts), Petroleum and natural gas industries — Materials for use in H S-containing
environments in oil and gas production
ISO 15607, Specification and qualification of welding procedures for metallic materials — General rules
ISO 15609 (all parts), Specification and qualification of welding procedures for metallic materials — Welding
procedure specification
ISO 15614-1, Specification and qualification of welding procedures for metallic materials — Welding
procedure test — Part 1: Arc and gas welding of steels and arc welding of nickel alloys
1)
ASME B1.20.1, Pipe Threads, General Purpose (Inch)
ASME B16.5, Pipe Flanges and Flanged Fittings
ASME B16.10, Face-to-Face and End-to-End Dimensions of Valves
ASME B16.34-2004, Valves Flanged, Threaded, and Welding End
ASME B16.47-2006, Large Diameter Steel Flanges: NPS 26 Through NPS 60
ASME B31.4-2006, Pipeline Transportation Systems for Liquid Hydrocarbons and Other Liquids
ANSI/ASME B31.8-2007, Gas Transmission and Distribution Piping Systems
ASME Boiler and Pressure Vessel Code, BPVC Section V:2007, Nondestructive Examination (BPVC)
ASME Boiler and Pressure Vessel Code, BPVC Section VIII, Division 1:2007, Rules for Construction of
Pressure Vessels (BPVC)
ASME Boiler and Pressure Vessel Code, BPVC Section VIII, Division 2 :2004, Alternative Rules (BPVC)
ASME Boiler and Pressure Vessel Code, BPVC Section IX, Welding and Brazing — Qualifications (BPVC)
2)
ASNT SNT-TC-1A , Recommended Practice No. SNT-TC-1A — Non-Destructive Testing
3)
ASTM A320/A320M, Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for Low-
Temperature Service
ASTM A370, Standard Test Methods and Definitions for Mechanical Testing of Steel Products
ASTM A578/A578M-07, Standard Specification for Straight-Beam Ultrasonic Examination of Rolled Steel
Plates for Special Applications
ASTM A609/A609M-02, Standard Practice for Castings, Carbon, Low-Alloy, and Martensitic Stainless Steel
Ultrasonic Examination Thereof
ASTM E562, Standard Test Method for Determining Volume Fraction by Systematic Manual Point Count

1) American Society of Mechanical Engineers, 345 East 47th Street, NY 10017-2392, USA.
2) American Society of Non-Destructive Testing, PO box 28518, 1711 Arlingate Lane, Columbus, OH 43228-0518, USA.
3) American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, USA.
2 © ISO 2009 – All rights reserved

ISO 14723:2009(E)
4)
AWS QC1 , Standard for AWS Certification of Welding Inspectors
EN 287 (all parts), Qualification test of welders — Fusion welding
EN 1092-1, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN
designated — Part 1: Steel flanges
EN 10204:2004, Metallic materials — Types of inspection documents
5)
MSS SP-44, Steel Pipeline Flanges
MSS SP-55, Quality Standard for Steel Castings for Valves, Flanges and Fittings and Other Piping
Components — Visual Method for Evaluation of Surface Irregularities
NACE TM0284, Standard Test Method — Evaluation of Pipeline and Pressure Vessel Steels for Resistance to
Hydrogen-Induced Cracking
4 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
4.1
ASME rating class
numerical pressure design class defined in ASME B16.34 and used for reference purposes
NOTE The ASME rating class is designated by the word “Class” followed by a number.
[ISO 14313:2007, 4.1]
4.2
bi-directional valve
valve designed for blocking the fluid in both downstream and upstream directions
[ISO 14313:2007, 4.2]
4.3
bleed
drain or vent
[ISO 14313:2007, 4.3]
4.4
block valve
gate, plug or ball valve that blocks flow into the downstream conduit when in the closed position
NOTE Valves are either single- or double-seated, bi-directional or uni-directional.
[ISO 14313:2007, 4.4]
4.5
breakaway thrust
breakaway torque
maximum thrust or torque required to operate a valve at maximum pressure differential
[ISO 14313:2007, 4.5]
4) The American Welding Society, 550 NW LeJeune Road, Miami, FL 33126, USA.
5) Manufacturers Standardization Society of the Valve & Fittings Industry Inc., 127 Park Street N.E., Vienna, VA 22180,
USA.
ISO 14723:2009(E)
4.6
by agreement
agreed between manufacturer and purchaser
[ISO 14313:2007, 4.6]
4.7
double-block-and-bleed valve
DBB
single valve with two seating surfaces that in the closed position provides a seal against pressure from both
ends of the valve with a means of venting/bleeding the cavity between the seating surfaces
[ISO 14313:2007, 4.7]
4.8
double-isolation-and-bleed valve
DIB
single valve with two seating surfaces, each of which in the closed position provides a seal against pressure
from a single source, with a means of venting/bleeding the cavity between the seating surfaces
NOTE This feature can be provided in one direction or in both directions.
[ISO 14313:2007, 4.8]
4.9
drive train
all parts of a valve drive between the operator and the obturator, including the obturator but excluding the
operator
[ISO 14313:2007, 4.9]
4.10
flow coefficient
K
v
volumetric flow rate of water at a temperature between 5 °C (40 °F) and 40 °C (104 °F) passing through a
valve and resulting in a pressure loss of 0,2 MPa (1 bar, 14,7 psi)
NOTE 1 K is expressed in SI units of cubic metres per hour.
v
NOTE 2 K is related to the flow rate coefficient, C , expressed in USC units of US gallons per minute at 15,6 °C (60 °F)
v v
resulting in a 1 psi pressure drop as given by Equation (1):
C
v
K = (1)
v
1,156
[ISO 14313:2007, 4.10]
4.11
full-opening valve
valve with an unobstructed opening not smaller than the internal bore of the end connections
[ISO 14313:2007, 4.11]
4.12
handwheel
wheel consisting of a rim connected to a hub, for example by spokes, and used to operate manually a valve
requiring multiple turns
[ISO 14313:2007, 4.12]
4 © ISO 2009 – All rights reserved

ISO 14723:2009(E)
4.13
locking device
part or an arrangement of parts for securing a valve in the open and/or closed position
[ISO 14313:2007, 4.13]
4.14
manual actuator
manual operator
wrench (lever) or handwheel with or without a gearbox
[ISO 14313:2007, 4.14]
4.15
maximum pressure differential
MPD
maximum difference between the upstream and downstream pressure across the obturator at which the
obturator may be operated
[ISO 14313:2007, 4.15]
4.16
nominal pipe size
NPS
numerical imperial designation of size, which is common to components in piping systems of any one size
NOTE Nominal pipe size is designated by the abbreviation “NPS” followed by a number.
[ISO 14313:2007, 4.16]
4.17
nominal pressure class
PN
numerical pressure design class used for reference purposes
NOTE Nominal pressure class is designated by the abbreviation “PN” followed by a number.
[ISO 14313:2007, 4.17]
4.18
nominal size
DN
numerical metric designation of size that is common to components in piping systems of any one size
NOTE Nominal size is designated by the abbreviation “DN” followed by a number.
[ISO 14313:2007, 4.18]
4.19
obturator
closure member
part of a valve, such as a ball, clapper, disc, gate or plug that is positioned in the flow stream to permit or
prevent flow
[ISO 14313:2007, 4.19]
4.20
operator
device (or assembly) for opening or closing a valve
[ISO 14313:2007, 4.20]
ISO 14723:2009(E)
4.21
packing gland
component used to compress the stem packing
[ISO 14313:2007, 4.21]
4.22
piggability
capability of a valve to permit the unrestricted passage of a pig
[ISO 14313:2007, 4.23]
4.23
pipe pup
transition piece
piece(s) of pipe or forged material, welded to the valve to prevent valve-seal damage from girth welding, for
matching of valve material to pipeline strength properties, or to provide a valve end matching the pipeline
dimensions
4.24
position indicator
device to show the position of the valve obturator
[ISO 14313:2007, 4.22]
4.25
powered operator
powered actuator
electric, hydraulic or pneumatic device bolted or otherwise attached to the valve for powered opening and
closing of the valve
[ISO 14313:2007, 4.24]
4.26
pressure cap
cap designed to contain internal pressure in the event of seal leakage or to prevent ingress due to hyperbaric
pressure
NOTE A pressure cap may also be used for protection; see 4.36.
4.27
pressure class
numerical pressure design class expressed in accordance with either the nominal pressure (PN) class or the
ASME rating class
NOTE In this International Standard, the pressure class is stated by the PN class, followed by the ASME rating class
in parentheses.
[ISO 14313:2007, 4.25]
4.28
pressure-containing parts
parts whose failure to function as intended results in a release of contained fluid into the environment
[ISO 14313:2007, 4.26]
4.29
pressure-controlling parts
parts, such as seat and obturator, intended to prevent or permit the flow of fluids
[ISO 14313:2007, 4.27]
6 © ISO 2009 – All rights reserved

ISO 14723:2009(E)
4.30
process-wetted parts
parts exposed directly to the pipeline fluid
[ISO 14313:2007, 4.28]
4.31
reduced-opening valve
valve with the opening through the obturator smaller than at the end connection(s)
[ISO 14313:2007, 4.29]
4.32
remote-operated vehicle
ROV
underwater vehicle operated remotely from a surface vessel or installation
4.33
seating surfaces
contact surfaces of the obturator and seat which ensure valve sealing
[ISO 14313:2007,4.30]
4.34
shaft
part of a check valve that connects the obturator to the operator and that can consist of one or more
components
4.35
stem
part that connects the obturator to the operator and that can consist of one or more components
[ISO 14313:2007, 4.31]
4.36
stem/shaft protector
cover to protect valve parts from mechanical damage
NOTE A pressure cap may also be used for protection.
4.37
support ribs or legs
metal structure that provides a stable footing when the valve is set on a fixed base
[ISO 14313:2007, 4.33]
4.38
through-conduit valve
valve with an unobstructed and continuous cylindrical opening
[ISO 14313:2007, 4.34]
4.39
uni-directional valve
valve designed for blocking the flow in one direction only
[ISO 14313:2007, 4.35]
ISO 14723:2009(E)
4.40
unless otherwise agreed
〈modification of the requirements of this International Standard〉 unless the manufacturer and purchaser agree
on a deviation
4.41
unless otherwise specified
〈modification of the requirements of this International Standard〉 unless the purchaser specifies otherwise
5 Symbols and abbreviated terms
5.1 Symbols
C Flow coefficient expressed in USC units
v
K Flow coefficient expressed in SI units

v
t thickness
5.2 Abbreviated terms
BM base metal
CE carbon equivalent
DBB double-block-and-bleed
DIB double-isolation-and-bleed
DN nominal size
HAZ heat-affected zone
HBW Brinell hardness, tungsten-ball indenter
HIC hydrogen-induced cracking
HRB Rockwell hardness, B scale
HRC Rockwell hardness, C scale
HV Vickers hardness
MPD maximum pressure differential
MT magnetic-particle testing
NDE non-destructive examination
NPS nominal pipe size
PN nominal pressure
PQR procedure qualification record
PT penetrant testing
PWHT post-weld heat treatment
QL quality level
8 © ISO 2009 – All rights reserved

ISO 14723:2009(E)
ROV remote-operated vehicle
RT radiographic testing
SMYS specified minimum yield strength
SSIV subsea isolation valve
USC United States customary (units)
NOTE The full stop (period) is used as a decimal separator for USC units.
UT ultrasonic testing
VT visual testing
WM weld metal
WPS weld-procedure specification
WPQ welder performance qualification
6 Valve types and configurations
6.1 Valve types
6.1.1 Gate valves
Typical configurations for gate valves with flanged and welding ends are shown, for illustration purposes only,
in Figures 1 and 2.
Gate valves shall have an obturator that moves in a plane perpendicular to the direction of flow.
6.1.2 Plug valves
Typical configurations for plug valves with flanged and welding ends are shown, for illustration purposes only,
in Figure 3.
Plug valves shall have a cylindrical or conical obturator that rotates about an axis perpendicular to the
direction of flow.
6.1.3 Ball valves
Typical configurations for ball valves with flanged or welding ends are shown, for illustration purposes only, in
Figures 4, 5 and 6.
Ball valves shall have a spherical obturator that rotates on an axis perpendicular to the direction of flow.
6.1.4 Check valves
Typical configurations for check valves are shown, for illustration purposes only, in Figures 7 to 13. Check
valves can also be of the wafer, axial-flow and lift type.
Check valves shall have an obturator that responds automatically to prevent flow in one direction.
ISO 14723:2009(E)
6.2 Valve configurations
6.2.1 Full-opening valves
Full-opening flanged-end valves shall be unobstructed in the fully opened position and have an internal bore
as specified in Table 1. There is no restriction on the upper limit of valve bore sizes.
Full-opening through-conduit valves shall have a circular bore in the obturator that allows a sphere to pass
with a nominal size not less than that specified in Table 1.
Welding-end valves can require a smaller bore at the welding end to mate with the pipe.
Valves with a non-circular opening through the obturator shall not be considered full opening.
6.2.2 Reduced-opening valves
Reduced-opening valves with a circular opening through the obturator shall be supplied with a minimum bore
as follows, unless otherwise specified:
⎯ valves DN 300 (NPS 12) and below: one size below nominal size of valve with bore according to Table 1;
⎯ valves DN 350 (NPS 14) to DN 600 (NPS 24): two sizes below nominal size of valve with bore according
to Table 1;
⎯ valves above DN 600 (NPS 24): by agreement.
EXAMPLE A DN 400 (NPS 16) – PN 250 (Class 1500) reduced-opening ball valve has a minimum bore of 287 mm.
Reduced-opening valves with a non-circular opening through the obturator shall be supplied with a minimum
opening by agreement.
10 © ISO 2009 – All rights reserved

ISO 14723:2009(E)
Table 1 — Minimum bore for full-opening valves by pressure class
Minimum bore dimension
mm
DN NPS
PN 20 to 100 PN 150 PN 250 PN 420
(Class 150 to 600) (Class 900) (Class 1500) (Class 2500)
15 1/2 13 13 13 13
20 19 19 19 19
3/4
25 1 25 25 25 25
32 11/4 32 32 32 32
40 11/2 38 38 38 38
50 2 49 49 49 42
65 21/2 62 62 62 52
80 3 74 74 74 62
100 4 100 100 100 87
150 6 150 150 144 131
200 8 201 201 192 179
250 10 252 252 239 223
300 12 303 303 287 265
350 14 334 322 315 292
400 16 385 373 360 333
450 18 436 423 406 374
500 20 487 471 454 419
550 22 538 522 500 —
600 24 589 570 546 —
650 26 633 617 594 —
700 28 684 665 641 —
750 30 735 712 686 —
800 32 779 760 730 —
850 34 830 808 775 —
900 36 874 855 819 —
950 38 925 904 — —
1 000 40 976 956 — —
1 050 42 1 020 1 006 — —
1 200 48 1 166 1 149 — —
1 350 54 1 312 — — —
1 400 56 1 360 — — —
1 500 60 1 458 — — —
ISO 14723:2009(E)
Key
1 yoke
2 stem
3 yoke bolting
4 bonnet bolting
5 stem packing
6 bonnet
7 gate stop
8 gate assembly
9 seat ring
10 body
11 gate guide
12 support ribs or legs
13 raised face
14 welding end
15 ring joint
A raised-face face-to-face dimension
B welding-end end-to-end dimension
C ring-joint end-to-end dimension
NOTE See Tables 2 to 6 for dimensions A, B and C.
Figure 1 — Typical expanding-gate/rising-stem gate valve
12 © ISO 2009 – All rights reserved

ISO 14723:2009(E)
Key
1 yoke
2 stem
3 yoke bolting
4 bonnet bolting
5 stem packing
6 bonnet
7 gate
8 seat ring
9 body
10 support ribs or legs
11 raised face
12 welding end
13 ring joint
A raised-face face-to-face dimension
B welding-end end-to-end dimension
C ring-joint end-to-end dimension
NOTE See Tables 2 to 6 for dimensions A, B and C.
Figure 2 — Typical slab-gate/through-conduit rising-stem gate valve
ISO 14723:2009(E)
Key
1 lubricator screw
2 gland studs and nuts
3 gland
4 cover studs and nuts
5 cover
6 cover gasket
7 stem packing
8 lubricant check valve
9 plug
10 body
11 stop collar
12 raised face
13 welding end
14 ring joint
A raised-face face-to-face dimension
B welding-end end-to-end dimension
C ring-joint end-to-end dimension
NOTE See Tables 2 to 6 for dimensions A, B and C.
Figure 3 — Typical plug valve
14 © ISO 2009 – All rights reserved

ISO 14723:2009(E)
Key
1 stem seal
2 bonnet cover
3 bonnet
4 body bolting
5 body
6 seat ring
7 stem
8 ball
9 raised face
10 welding end
11 ring joint
A raised-face face-to-face dimension
B welding-end end-to-end dimension
C ring-joint end-to-end dimension
NOTE See Tables 2 to 6 for dimensions A, B and C.
Figure 4 — Typical top-entry ball valve
ISO 14723:2009(E)
Key
1 stem
2 body cover
3 stem seal
4 body
5 seat ring
6 ball
7 body bolting
8 closure
9 raised face
10 welding end
11 ring joint
A raised-face face-to-face dimension
B welding-end end-to-end dimension
C ring-joint end-to-end dimension
NOTE See Tables 2 to 6 for dimensions A, B and C.
Figure 5 — Typical three-piece ball valve
16 © ISO 2009 – All rights reserved

ISO 14723:2009(E)
Key
1 stem
2 body cover
3 stem seal
4 body
5 seat ring
6 ball
7 closure
8 raised face
9 welding end
10 ring joint
A raised-face face-to-face dimension
B welding-end end-to-end dimension
C ring-joint end-to-end dimension
NOTE See Tables 2 to 6 for dimensions A, B and C.
Figure 6 — Typical welded-body ball valve
ISO 14723:2009(E)
Key
1 cover bolting
2 cover
3 body
4 clapper disc arm
5 shaft
6 clapper disc
7 seat ring
8 support ribs or legs
9 raised face
10 welding end
11 ring joint
A raised-face face-to-face dimension
B welding-end end-to-end dimension
C ring-joint end-to-end dimension
NOTE See Tables 2 to 6 for dimensions A, B and C.
a
Direction of flow.
Figure 7 — Typical reduced-opening swing check valve
18 © ISO 2009 – All rights r
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