ISO 14313:2007

INTERNATIONAL ISO
STANDARD 14313
Second edition
2007-12-15
Petroleum and natural gas industries —
Pipeline transportation systems —
Pipeline valves
Industries du pétrole et du gaz naturel — Systèmes de transport par
conduites — Robinets de conduites

Reference number
©
ISO 2007
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©  ISO 2007
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ii © ISO 2007 – All rights reserved

Contents Page
Foreword. v
Introduction . vi
1 Scope .1
2 Conformance.1
2.1 Units of measurement .1
2.2 Rounding .1
2.3 Compliance to standard.1
3 Normative references .2
4 Terms and definitions .4
5 Symbols and abbreviated terms .7
5.1 Symbols .7
5.2 Abbreviated terms .7
6 Valve types and configurations.8
6.1 Valve types .8
6.2 Valve configurations .9
7 Design .23
7.1 Design standards and calculations .23
7.2 Pressure and temperature rating .24
7.3 Sizes.24
7.4 Face-to-face and end-to-end dimensions .25
7.5 Valve operation .39
7.6 Pigging.40
7.7 Valve ends .40
7.8 Pressure relief.41
7.9 Bypasses, drains and vents .42
7.10 Injection points .42
7.11 Drain, vent and sealant lines .42
7.12 Drain, vent and sealant valves .43
7.13 Hand-wheels and wrenches — Levers .43
7.14 Locking devices.43
7.15 Position of the obturator.43
7.16 Position indicators.43
7.17 Travel stops.44
7.18 Actuator, operators and stem extensions.44
7.19 Lifting .44
7.20 Drive trains .44
7.21 Stem retention.45
7.22 Fire type-testing.45
7.23 Anti-static device .45
7.24 Design documents.45
7.25 Design document review .45
8 Materials .46
8.1 Material specification .46
8.2 Service compatibility.46
8.3 Forged parts .46
8.4 Composition limits.46
8.5 Toughness test requirements .47
8.6 Bolting.48
8.7 Sour service. 48
8.8 Vent and drain connections. 48
9 Welding . 48
9.1 Qualifications. 48
9.2 Impact testing. 48
9.3 Hardness testing . 49
9.4 Repair . 49
10 Quality control. 51
10.1 NDE requirements. 51
10.2 Measuring and test equipment . 51
10.3 Qualification of inspection and test personnel. 51
10.4 NDE of repairs . 52
10.5 Weld end NDE. 52
10.6 Visual inspection of castings. 52
11 Pressure testing . 52
11.1 General . 52
11.2 Stem backseat test. 53
11.3 Hydrostatic shell test. 53
11.4 Hydrostatic seat test. 54
11.5 Testing of drain, vent and sealant injection lines. 55
11.6 Draining. 55
12 Coating. 55
13 Marking. 56
14 Preparation for shipment . 58
15 Documentation . 58
Annex A (normative) Requirements for non-destructive examination. 59
Annex B (normative) Supplementary test requirements .63
Annex C (informative) Supplementary documentation requirements. 67
Annex D (informative) Purchasing guidelines . 68
Annex E (informative) Marking example. 75
Bibliography . 77

iv © ISO 2007 – All rights reserved

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 14313 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 14313:1999), which has been technically
revised, principally by the following.
⎯ Clause 2, on the requirements for conformity to this International Standard, has been added for
clarification.
⎯ Clause 7, on the requirements for allowable stresses and allowable deflection on design, has been
revised and clarified.
⎯ Clause 8, on material, has been revised to align the requirements with global industry practice for carbon
content and carbon equivalent for pressure-containing, pressure-controlling, welding ends and parts
requiring welding.
⎯ New requirements on repairs and NDE of welding repairs have been added to Clause 9 on Welding.
⎯ A new table (Table D.2) has been added to Annex D (informative) to provide more guidance for those
requirements listed in the text as requiring agreement between the manufacturer/purchaser.

Introduction
This International Standard is the result of harmonizing the requirements of ISO 14313:1999 and
[5]
API Spec 6D-2002 .
The revision of ISO 14313 is developed based on input from both ISO/TC67/SC2 WG2 and
API 6D TG technical experts. The technical revisions have been made In order to accommodate the needs of
industry and to move this International Standard to a higher level of service to the petroleum and natural gas
industry.
Users of this International Standard should be aware that further or differing requirements can be needed for
individual applications. This International Standard is not intended to inhibit a manufacturer from offering, or
the purchaser from accepting, alternative equipment or engineering solutions for the individual application.
This may be particularly applicable where there is innovative or developing technology. Where an alternative
is offered, the manufacturer should identify any variations from this International Standard and provide details.

vi © ISO 2007 – All rights reserved

INTERNATIONAL STANDARD ISO 14313:2007(E)

Petroleum and natural gas industries — Pipeline transportation
systems — Pipeline valves
1 Scope
This International Standard specifies requirements and provides recommendations for the design,
manufacturing, testing and documentation of ball, check, gate and plug valves for application in pipeline
systems meeting the requirements of ISO 13623 for the petroleum and natural gas industries.
This International Standard is not applicable to subsea pipeline valves, as they are covered by a separate
International Standard (ISO 14723).
This International Standard is not applicable to valves for pressure ratings exceeding PN 420 (Class 2 500).
2 Conformance
2.1 Units of measurement
In this International Standard, data are expressed in both SI units and USC units. For a specific order item,
unless otherwise stated, only one system of units shall be used, without combining data expressed in the
other system.
For data expressed in SI units, a comma is used as the decimal separator and a space is used as the
thousands separator. For data expressed in USC units, a dot (on the line) is used as the decimal separator
and a comma is used as the thousands separator.
2.2 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.
2.3 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, corrigendum, and maintenance agency output) applies.
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 5208:1993, Industrial valves — Pressure testing of valves
ISO 7268, Pipe components — Definition of nominal pressure
ISO 9606-1, Approval testing of welders — Fusion welding — Part 1: Steels
ISO 9712, Non-destructive testing — Qualification and certification of personnel
ISO 10474, Steel and steel products — Inspection documents
ISO 10497, Testing of valves — Fire type-testing requirements
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 and nickel alloys
ISO 23277, Non-destructive testing of welds — Penetrant testing of welds — Acceptance levels
ISO 23278, Non-destructive testing of welds — Magnetic particle testing of welds — Acceptance levels
1)
ASME B1.20.1 , Pipe Threads, General Purpose, Inch
ASME B16.5-1996, Pipe Flanges and Flanged Fittings : NPS 1/2 through 24
ASME B16.10-2000, 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 Metric/Inch Standard
ASME B31.4-2006, Pipeline Transportation Systems for Liquid Hydrocarbons and Other Liquids
ASME B31.8-2003, Gas Transmission and Distribution Piping Systems
ASME Boiler and Pressure Vessel Code, Section V: Nondestructive Examination

th
1) American Society of Mechanical Engineers International, 345 East 47 Street, NY 10017-2392, USA
2 © ISO 2007 – All rights reserved

ASME Boiler and Pressure Vessel Code — Section VIII: Rules for Construction of Pressure Vessels
Division 1, Rules for Construction of Pressure Vessels
ASME Boiler and Pressure Vessel Code — Section VIII: Rules for Construction of Pressure Vessels
Division 2: Alternative Rules
ASME Boiler and Pressure Vessel Code — Section IX: Welding and Brazing Qualifications
2)
ASNT SNT-TC-1A , Recommended Practice No. SNT-TC-1A — Personnel Qualification and Certification in
Non-Destructive Testing
3)
ASTM A320 , 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 A388, Standard Practice for Ultrasonic Examination of Heavy Steel Forgings
ASTM A435, Standard Specification for Straight-Beam Ultrasonic Examination of Steel Plates
ASTM A577, Standard Specification for Ultrasonic Angle-Beam Examination of Steel Plates
4)
AWS QC1 , Standard for AWS Certification of Welding Inspectors
5)
EN 287-1 , Qualification test of welders — Fusion welding — Part 1: Steels
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 products — Type of inspection documents
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 TM0177-2005, Standard test method. Laboratory testing of metals for resistance to specific forms of
environmental cracking in H S environments
NACE TM0284, Standard Test Method — Evaluation of Pipeline and Pressure Vessel Steels for Resistance to
Hydrogen-Induced Cracking
2) American Society of Non-Destructive Testing, P.O. Box 28518, 1711 Arlingate Lane, Columbus, OH 43228-0518,
USA.
3) ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, USA.
4) The American Welding Society, 550 NW LeJeune Road, Miami, FL 33126, USA.
5) CEN, European Committee for Standardization, Central Secretariat, Rue de Stassart 36, B-1050, Brussels, Belgium.
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.
4.2
bi-directional valve
valve designed for blocking the fluid in both downstream and upstream directions
4.3
bleed
drain or vent
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.
4.5
breakaway thrust
breakaway torque
maximum thrust or torque required to operate a valve at maximum pressure differential
4.6
by agreement
agreed between manufacturer and purchaser
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
NOTE This valve does not provide positive double isolation when only one side is under pressure. See double-
isolation-and-bleed valve (4.8).
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.
4.9
drive train
all parts of a valve drive between the operator and the obturator, including the obturator but excluding the
operator
4 © ISO 2007 – All rights reserved

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 0,1 MPa (1 bar; 14.5 psi)
NOTE K is expressed in SI units of cubic metres per hour.
v
NOTE K is related to the flow 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
4.11
full-opening valve
valve with an unobstructed opening, not smaller than the internal bore of the end connections
4.12
handwheel
wheel consisting of a rim connected to a hub, for example by spokes, and used to manually operate a valve
requiring multiple turns
4.13
locking device
part or an arrangement of parts for securing a valve in the open and/or closed position
4.14
manual actuator
manual operator
wrench (lever) or hand-wheel with or without a gearbox
4.15
maximum pressure differential
MPD
maximum difference between the upstream and downstream pressure across the obturator at which the
obturator may be operated
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.
4.17
nominal pressure class
PN
numerical pressure design class as defined in ISO 7268 and used for reference purposes
NOTE Nominal pressure (PN) class is designated by the abbreviation “PN” followed by a number.
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.
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
4.20
operator
device (or assembly) for opening or closing a valve
4.21
packing gland
component used to compress the stem packing
4.22
position indicator
device to show the position of the valve obturator
4.23
piggability
capability of a valve to permit the unrestricted passage of a pig
4.24
powered actuator
powered operator
electric, hydraulic or pneumatic device bolted or otherwise attached to the valve for powered opening and
closing of the valve
4.25
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
between brackets.
4.26
pressure-containing parts
parts, whose failure to function as intended results in a release of contained fluid into the environment
4.27
pressure-controlling parts
parts, such as seat and obturator, intended to prevent or permit the flow of fluids
4.28
process-wetted parts
parts exposed directly to the pipeline fluid
4.29
reduced-opening valve
valve with the opening through the obturator smaller than at the end connection(s)
4.30
seating surfaces
contact surfaces of the obturator and seat which ensure valve sealing
4.31
stem
part that connects the obturator to the operator and which can consist of one or more components
6 © ISO 2007 – All rights reserved

4.32
stem extension assembly
assembly consisting of the stem extension and the stem extension housing
4.33
support ribs or legs
metal structure that provides a stable footing when the valve is set on a fixed base
4.34
through-conduit valve
valve with an unobstructed and continuous cylindrical opening
4.35
uni-directional valve
valve designed for blocking the flow in one direction only
4.36
unless otherwise agreed
〈modification of the requirements of this International Standard〉 unless the manufacturer and purchaser agree
on a deviation
4.37
unless otherwise specified
〈modification of the requirements of this International Standard〉 unless the purchaser specifies otherwise
4.38
venturi plug valve
valve with a substantially reduced opening through the plug and a smooth transition from each full-opening
end to the reduced opening
5 Symbols and abbreviated terms
5.1 Symbols
C flow coefficient in USC units
v
K flow coefficient in metric 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
HRC Rockwell C hardness
HV Vickers hardness
MPD maximum pressure differential
MT magnetic-particle testing
NDE non-destructive examination
NPS nominal pipe size
PN nominal pressure
PQR (weld) procedure qualification record
PT penetrant testing
PWHT post-weld heat treatment
RT radiographic testing
SMYS specified minimum yield strength
USC United States Customary (units)
UT ultrasonic 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. The gate can
be constructed of one piece for slab-gate valves or of two or more pieces for expanding-gate valves.
Gate valves shall be provided with a back seat or secondary stem sealing feature in addition to the primary
stem seal.
6.1.2 Lubricated and non-lubricated 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.
8 © ISO 2007 – All rights reserved

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 which responds automatically to block fluid in one direction.
6.2 Valve configurations
6.2.1 Full-opening valves
Full-opening flanged-end valves shall be unobstructed in the fully opened position and shall 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.
Table 1 — Minimum bore for full-opening valves
Minimum bore by class
mm
DN NPS
PN 20 to 100 PN 150 PN 250 PN 420
(Class 150 to 600) (Class 900) (Class 1 500) (Class 2 500)
15 ½ 13 13 13 13
20 ¾ 19 19 19 19
25 1 25 25 25 25
32 1¼ 32 32 32 32
40 1½ 38 38 38 38
50 2 49 49 49 42
65 2½ 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 — — —
10 © ISO 2007 – All rights reserved

Key
1 stem indicator
2 stem enclosure
3 handwheel
4 yoke nut
5 yoke
6 stem
7 yoke bolting
8 stem packing
9 relief valve
10 bonnet
11 bonnet bolting
12 gate guide
13 gate assembly
14 seat ring
15 body
16 support ribs or legs
17 raised face
18 welding end
19 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 — Expanding-gate/rising-stem gate valve
Key
1 stem indicator
2 stem enclosure
3 hand-wheel
4 yoke nut
5 yoke
6 stem
7 yoke bolting
8 stem packing
9 relief valve
10 bonnet
11 bonnet bolting
12 gate
13 seat ring
14 body
15 support ribs or
legs
16 raised face
17 welding end
18 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 — Slab-gate/through-conduit rising-stem gate valve
12 © ISO 2007 – All rights reserved

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 — Plug valve
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 — Top-entry ball valve
14 © ISO 2007 – All rights reserved

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 — Three-piece ball valve
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 — Welded-body ball valve
16 © ISO 2007 – All rights reserved

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
12 direction of flow
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 7 — Reduced-opening swing check valve
Key
1 cover bolting
2 cover
3 body
4 clapper disc arm
5 shaft
6 seat ring
7 clapper disc
8 support ribs or legs
9 raised face
10 welding end
11 ring joint
12 direction of flow
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 8 — Full-opening swing check valve
18 © ISO 2007 – All rights reserved

Key
1 body
2 hinge
3 nut
4 closure plate/stud
assembly
5 seat ring
6 bearing spacers
7 hinge pin
8 hinge pin retainers
9 direction of flow
Figure 9 — Single-plate wafer-type check valve, long pattern
Key
1 body
2 closure plate
3 stop pin
4 spring
5 hinge pin
6 plate lug bearings
7 body lug bearings
8 stop pin retainers
9 hinge pin retainers
10 spring bearings
11 direction of flow
Figure 10 — Typical dual-plate wafer-type check valve, long pattern

20 © ISO 2007 – All rights reserved

Key
1 body
2 clapper
3 pin
4 clapper seal
5 body seal
6 lifting eye
7 direction of flow
Figure 11 — Single-plate wafer-type check valve, short pattern
Key
1 body
2 rod guidance
3 disc
4 bearing
5 spring
6 flow direction
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 12 — Axial flow check valve
22 © ISO 2007 – All rights reserved

Key
1 cover bolting
2 cover
3 body
4 piston
5 liner
6 seat ring
7 support ribs or legs
9 raised face
10 welding end
11 ring joint
12 direction of flow
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 13 — Piston check valve
7 Design
7.1 Design standards and calculations
Pressure-containing parts, including bolting, shall be designed with materials specified in Clause 8.
Design and calculations for pressure-containing elements shall be in accordance with an internationally
recognized design code or standard with consideration for pipe loads, operating forces, etc. The choice of
standard shall be by agreement.
NOTE 1 Examples of internationally recognized design codes or standards are ASME Section VIII Division 1 or
Division 2, ASME B16.34, EN 12516-1 and EN 13445-3.
The allowable stress values shall be consistent with the selected design code or standard.
If the selected design code or standard specifies a test pressure less than 1,5 times the design pressure, then
the design pressure for the body calculation shall be increased such that the hydrostatic test pressure in 11.3
can be applied.
NOTE 2 Some design codes or standards require a consistent and specific application of requirements for fabrication
and testing, including NDE.
7.2 Pressure and temperature rating
The nominal pressure (PN) class or the ASME rating class shall be used for the specification of the required
pressure class.
Valves covered by this International Standard shall be furnished in one of the following classes:
⎯ PN 20 (class 150);
⎯ PN 50 (class 300);
⎯ PN 64 (class 400);
⎯ PN 100 (class 600);
⎯ PN 150 (class 900);
⎯ PN 250 (class 1500);
⎯ PN 420 (class 2500).
Pressure-temperature ratings for class-rated valves shall be in accordance with the applicable rating table for
the appropriate material group in ASME B16.34.
Pressure-temperature ratings for PN-rated valves shall be in accordance with the applicable rating table for
the appropriate material group in EN 1092-1.
If intermediate design pressures and temperatures are specified by the purchaser, the pressure-temperature
rating shall be determined by linear interpolation.
Pressure-temperature ratings for valves made from materials not covered by ASME B16.34 and EN 1092-1
shall be determined from the material properties in accordance with the applicable design standard.
NOTE Non-metallic parts can limit maximum pressures and minimum and maximum operating temperatures.
The maximum operating pressure at the minimum and maximum operating temperatures shall be marked on
the nameplate.
7.3 Sizes
Valves constructed to this International Standard shall be furnished in nominal sizes as listed in Table 1.
NOTE In this International Standard, DN sizes are stated first followed by the equivalent NPS size between brackets.
Except for reduced-opening valves, valve sizes shall be specified by the nominal sizes (DN) or nominal pipe
size (NPS).
Reduced-opening valves with a circular opening shall be specified by the nominal size of the end connections
and the nominal size of the reduced opening in accordance
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