FprEN ISO 15761
(Main)This document specifies the requirements for a series of compact steel gate, globe and check valves for petroleum and natural gas industry applications.
It is applicable to valves of:
— nominal sizes DN 8, 10, 15, 20, 25, 32, 40, 50, 65, 80 and 100,
— corresponding to nominal pipe sizes NPS ¼, ⅜, ½, , 1, 1¼, 1½, 2, 2½, 3 and 4,
— pressure designations PN 16, 25, 40, 63, 100, 250 and 400, and
— pressure designations Class 150, 300, 600, 800, 1 500 and 2 500.
Class 800 is not a listed class designation, but is an intermediate Class number widely used for socket welding and threaded end compact valves covered by this document. There is no equivalent PN designation.
This document includes provisions for the following valve characteristics:
— outside screw with rising stems (OS & Y): in sizes 8 ≤ DN ≤ 100;
— inside screw with rising stems (ISRS): in sizes 8 ≤ DN ≤ 65 with a pressure designation PN ≤ 100 or Class ≤ 800;
— socket welding or threaded ends: in sizes 8 ≤ DN ≤ 65;
— flanged or butt-welding ends excluding flanged end Class 800;
— bonnet joint construction that is bolted, welded or threaded with seal weld;
— bonnet joint construction that uses a union nut with a pressure designation PN ≤ 45 or Class ≤ 800;
— body seat openings;
— materials: as specified;
— testing and inspection.
This document covers valve end flanges in accordance with EN 1092-1 and ASME B16.5 and valve body ends having tapered pipe threads in accordance with ISO 7-1 or ASME B1.20.1. It is applicable to extended body construction in sizes 15 ≤ DN ≤ 50 with pressure designations Class 800 and Class 1 500 and to bellows and bellows assembly construction adaptable to gate or globe valves in sizes 8 ≤ DN ≤ 50. Also covered are requirements for bellows stem seal type testing.
Schieber, Kugel- und Rückschlagventile aus Stahl mit Nennweiten DN 100 und kleiner für die Erdöl- und Erdgasindustrie (ISO/FDIS 15761:2020)
Robinets-vannes, robinets à soupape et clapets de non retour en acier de dimensions DN 100 et inférieures, pour les industries du pétrole et du gaz naturel (ISO/FDIS 15761:2020)
Le présent document spécifie les exigences pour une série de robinets-vannes, robinets à soupape et clapets de non-retour, en acier massif, pour des applications dans les industries du pétrole et du gaz naturel.
Elle est applicable aux appareils de robinetterie:
— de diamètres nominaux DN 8, 10, 15, 20, 25, 32, 40, 50, 65, 80 et 100,
— correspondant aux dimensions nominales de tuyauterie NPS ¼, ⅜, ½, , 1, 1¼, 1½, 2, 2½, 3 et 4,
— affichant des désignations de pression PN 16, 25, 40, 63, 100, 250 et 400, et
— affichant des désignations de pression Class 150, 300, 600, 800, 1 500 et 2 500.
Class 800 n'est pas une désignation de pression Class énumérée. C'est un numéro Class intermédiaire largement utilisé pour les appareils de robinetterie en acier massif à extrémités à emboîter et à souder et extrémités filetées couverts par le présent document. Il n'existe pas de désignation PN équivalente.
Le présent document contient des dispositions relatives aux caractéristiques des appareils de robinetterie suivants:
— tiges montantes à filetage extérieur (OS & Y): de dimensions 8 ≤ DN ≤ 100;
— tiges montantes à filetage intérieur (ISRS): de dimensions 8 ≤ DN ≤ 65 avec une désignation de la pression PN ≤ 100 ou Class ≤ 800;
— extrémités à emboîter et à souder ou extrémités filetées, de dimensions 8 ≤ DN ≤ 65;
— extrémités à brides ou extrémités à souder en bout, excepté les extrémités à brides de Class 800;
— assemblage du chapeau qui est boulonné, soudé ou fileté avec une soudure d'étanchéité;
— assemblage du chapeau utilisant un écrou de raccord union avec une désignation de pression correspondant à PN ≤ 45 ou Class ≤ 800;
— ouvertures au siège de l'appareil de robinetterie;
— matériaux: comme spécifié;
— essais et contrôle.
Le présent document couvre les extrémités à brides des appareils de robinetterie conformes à l'EN 1092-1 et à l'ASME B16.5, ainsi que les extrémités de corps des appareils de robinetterie avec des filetages de tuyauterie coniques conformes à l'ISO 7-1 ou à l'ASME B1.20.1. Il s'applique aux constructions à corps rallongés de dimensions 15 ≤ DN ≤ 50 avec des désignations de pression Class 800 et Class 1 500, et aux constructions à soufflets et aux joints à soufflets adaptables aux robinets-vannes ou aux robinets à soupape de dimensions 8 ≤ DN ≤ 50. Il couvre également des exigences applicables aux essais de type des étanchéités de tige par soufflet.
Tablasti, krogelni in nepovratni ventitli za velikosti DN 100 in manj za naftne in zemeljskoplinske industrije (ISO/FDIS 15761:2020)
General Information
RELATIONS
Standards Content (sample)
SLOVENSKI STANDARD
oSIST prEN ISO 15761:2020
01-marec-2020
Tablasti, krogelni in nepovratni ventitli za velikosti DN 100 in manj za naftne in
zemeljskoplinske industrije (ISO/DIS 15761:2019)Steel gate, globe and check valves for sizes DN 100 and smaller, for the petroleum and
natural gas industries (ISO/DIS 15761:2019)Schieber, Kugel- und Rückschlagventile aus Stahl mit Nennweiten DN 100 und kleiner
für die Erdöl- und Erdgasindustrie (ISO/DIS 15761:2019)Robinets-vannes, robinets à soupape et clapets de non retour en acier de dimensions
DN 100 et inférieures, pour les industries du pétrole et du gaz naturel (ISO/DIS15761:2019)
Ta slovenski standard je istoveten z: prEN ISO 15761
ICS:
23.060.01 Ventili na splošno Valves in general
75.180.20 Predelovalna oprema Processing equipment
oSIST prEN ISO 15761:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN ISO 15761:2020
DRAFT INTERNATIONAL STANDARD
ISO/DIS 15761
ISO/TC 153 Secretariat: AFNOR
Voting begins on: Voting terminates on:
2019-12-03 2020-02-25
Steel gate, globe and check valves for sizes DN 100 and
smaller, for the petroleum and natural gas industries
Robinets-vannes, robinets à soupape et clapets de non-retour en acier de dimensions DN 100 et inférieures,
pour les industries du pétrole et du gaz naturelICS: 75.180.20
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 15761:2019(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. ISO 2019
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COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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ii © ISO 2019 – All rights reserved
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oSIST prEN ISO 15761:2020
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Contents Page
Foreword ..........................................................................................................................................................................................................................................v
Introduction ................................................................................................................................................................................................................................vi
1 Scope ................................................................................................................................................................................................................................. 1
2 Normative references ...................................................................................................................................................................................... 1
3 Terms and definitions ..................................................................................................................................................................................... 2
4 Pressure/temperature ratings .............................................................................................................................................................. 3
4.1 Valve ratings .............................................................................................................................................................................................. 3
4.2 Temperature constraints ................................................................................................................................................................ 4
5 Design .............................................................................................................................................................................................................................. 4
5.1 Reference design ................................................................................................................................................................................... 4
5.2 Flow passageway .................................................................................................................................................................................. 4
5.3 Wall thickness .......................................................................................................................................................................................... 5
5.4 Valve body ................................................................................................................................................................................................... 6
5.4.1 General...................................................................................................................................................................................... 6
5.4.2 Socket welding ends ..................................................................................................................................................... 6
5.4.3 Threaded ends ................................................................................................................................................................... 8
5.4.4 Flanged ends ...................................................................... .................................................................................................. 8
5.4.5 Butt-welding ends........................................................................................................................................................... 9
5.4.6 Body seats ...........................................................................................................................................................................10
5.5 Valve bonnet or cover .....................................................................................................................................................................11
5.6 Obturator ..................................................................................................................................................................................................12
5.6.1 Seating surfaces .............................................................................................................................................................12
5.6.2 Gate valve obturators ................................................................................................................................................13
5.6.3 Globe valve obturators .............................................................................................................................................13
5.6.4 Check valve obturators ............................................................................................................................................13
5.7 Stem ...............................................................................................................................................................................................................14
5.8 Stem nut or stem bushing ...........................................................................................................................................................15
5.9 Packing, packing chamber, and gland ...............................................................................................................................16
5.10 Packing retention ...............................................................................................................................................................................16
5.11 Handwheel ...............................................................................................................................................................................................17
6 Materials ....................................................................................................................................................................................................................17
6.1 Trim materials ......................................................................................................................................................................................17
6.2 Materials other than trim ...........................................................................................................................................................17
7 Marking .......................................................................................................................................................................................................................18
7.1 Legibility ....................................................................................................................................................................................................18
7.2 Body marking ........................................................................................................................................................................................18
7.3 Ring joint groove marking ..........................................................................................................................................................20
7.4 Identification plate marking .....................................................................................................................................................20
7.5 Weld fabrication marking ...........................................................................................................................................................21
8 Testing and inspection ................................................................................................................................................................................21
8.1 Pressure tests ........................................................................................................................................................................................21
8.1.1 General...................................................................................................................................................................................21
8.1.2 Shell test ...............................................................................................................................................................................21
8.1.3 Closure leakage test ........................................................................................................................................... .........22
8.1.4 Optional closure leakage test for gate valves .......................................................................................23
8.1.5 Backseat leakage test ................................................................................................................................................23
8.1.6 Fugitive emission testing .......................................................................................................................................23
8.2 Inspection .................................................................................................................................................................................................23
9 Preparation for despatch ..........................................................................................................................................................................24
Annex A (normative) Requirements for extended body gate valve bodies ...............................................................25
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Annex B (normative) Requirements for valves with bellows stem seals .....................................................................30
Annex C (normative) Type testing of bellows stem seals .............................................................................................................34
Annex D (informative) Identification of valve parts ..........................................................................................................................37
Annex E (informative) Information to be specified by the purchaser ............................................................................40
Annex F (informative) Valve material combinations ........................................................................................................................42
Bibliography .............................................................................................................................................................................................................................46
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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 (see 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 (see 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 of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 153, Valves.
This second edition cancels and replaces the first edition (ISO 15761:2002), which has been technically
revised:— Clause 2 "Normative references" was updated;
— addition of ASME Class 2 500 designation and relevant dimensions ;
— addition of higher PN Class designations, including PN 63, 250 and 400, and relevant dimensions.
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.© ISO 2019 – All rights reserved v
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Introduction
The purpose of this document is to establish basic requirements and practices for socket welding, butt-
welding, threaded, and flanged end steel gate, globe, and check valves with reduced body seat openings,
whose general construction parallels that described in API 602 and BS 5352.The form of this document corresponds to ISO 6002 and ISO 10434. It is not the purpose of this
document to replace ISO 6002, ISO 10434 or any other International Standard which is not identified
with petroleum or natural gas industry applications.vi © ISO 2019 – All rights reserved
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oSIST prEN ISO 15761:2020
DRAFT INTERNATIONAL STANDARD ISO/DIS 15761:2019(E)
Steel gate, globe and check valves for sizes DN 100 and
smaller, for the petroleum and natural gas industries
1 Scope
This document specifies the requirements for a series of compact steel gate, globe, and check valves for
petroleum and natural gas industry applications.It is applicable to valves of
— nominal sizes DN 8, 10, 15, 20, 25, 32, 40, 50, 65, 80 and 100,
— corresponding to nominal pipe sizes NPS ¼, ⅜, ½, ¾, 1, 1¼, 1½, 2, 2½, 3 and 4,
— pressure designations PN 16, 25, 40, 63, 100, 250 and 400,
— pressure designations Class 150, 300, 600, 800, 1 500 and 2 500.
Class 800 is not a listed class designation, but is an intermediate Class number widely used for
socket welding and threaded end compact valves covered by this standard. There is no equivalent PN
designation.It includes provisions for the following valve characteristics:
— outside screw with rising stems (OS & Y): in sizes 8 ≤ DN ≤ 100;
— inside screw with rising stems (ISRS): in sizes 8 ≤ DN ≤ 65 with a pressure designation PN ≤ 100 or
Class ≤ 800;— socket welding or threaded ends: in sizes 8 ≤ DN ≤ 65;
— flanged or butt-welding ends excluding flanged end Class 800;
— bonnet joint construction that is bolted, welded or threaded with seal weld;
— bonnet joint construction that uses a union nut with a pressure designation PN ≤ 45 or Class ≤ 800;
— body seat openings;— materials: as specified;
— testing and inspection.
This document covers valve end flanges in accordance with EN 1092-1 and ASME B16.5 and valve
body ends having tapered pipe threads in accordance with ISO 7-1 or ASME B1.20.1. It is applicable to
extended body construction in sizes 15 ≤ DN ≤ 50 with pressure designations Class 800 and Class 1 500
and to bellows and bellows assembly construction as may be adaptable to gate or globe valves in sizes
8 ≤ DN ≤ 50. It also covered are requirements for bellows stem seal type testing.
2 Normative referencesThe 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 2019 – All rights reserved 1
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ISO 7-2, Pipe threads where pressure-tight joints are made on the threads — Part 2: Verification by means
of limit gaugesISO 2902, ISO metric trapezoidal screw threads — General plan
ISO 2903, ISO metric trapezoidal screw threads — Tolerances
ISO 2904, ISO metric trapezoidal screw threads — Basic dimensions
ISO 5208, Industrial valves — Pressure testing of metallic valves
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 9606-1, Qualification testing of welders — Fusion welding — Part 1: SteelsISO 15607, Specification and qualification of welding procedures for metallic materials — General rules
ISO 15609-1, Specification and qualification of welding procedures for metallic materials — Welding
procedure specification — Part 1: Arc weldingISO 15610, Specification and qualification of welding procedures for metallic materials — Qualification
based on tested welding consumablesISO 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 15614-2, Specification and qualification of welding procedures for metallic materials — Welding
procedure test — Part 2: Arc welding of aluminium and its alloysISO 15649, Petroleum and natural gas industries — Piping
EN 1092-1, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN
designated — Part 1: Steel flangesEN 10269, Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties
EN 12516-1+A1, Industrial valves — Shell design strength — Part 1: Tabulation method for steel valve shells
ASME B1.1, Unified Inch Screw Threads (UN and UNR Thread Form)ASME B1.5, Acme Screw Threads
ASME B1.8, Stub Acme Screw Threads
ASME B1.20.1, Pipe Threads, General Purpose, Inch
ASME B16.5, Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
ASME B16.10, Face-to Face and End-to-End Dimensions of ValvesASME B16.11, Forged Fittings, Socket-Welding and Threaded
ASME B16.34 - 2013, Valves Flanged, Threaded and Welding End
ASME BPVC-IX Boiler and Pressure Vessel Code — Section IX — Welding, Brazing, and fusing Qualifications
ASTM A307, Standard Specification for Carbon Steel Bolts, Studs, and Threaded Rod 60 000 PSI Tensile
Strength3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http:// www .iso .org/ obp— IEC Electropedia: available at http:// www .electropedia .org/
3.1
PN or Class
alphanumeric designation for pressure-temperature rating that is common for components used
in a piping system, used for reference purposes, comprising the letters "PN" or "Class" followed
by a dimensionless number indirectly related to the pressure retaining capability as a function of
temperature of the componentNote 1 to entry: The number following the letters PN or Class does not represent a measurable value and is not
used for calculation purposes except where specified in the relevant standard. There is no definitive correlation
that links PN designations to Class designations.Note 2 to entry: The allowable pressure for a valve having a PN or Class number depends on the valve material
and its application temperature and is to be found in tables of pressure/temperature ratings. PN or Class usage is
applicable to steel valves bearing DN or NPS nominal size designations.Note 3 to entry: See ISO 7268 and ASME B16.34.
3.2
nominal size
DN or NPS
alphanumeric designation of size for components of a pipework system, which is used for reference
purposes, comprising the letters DN or NPS followed by a dimensionless number indirectly related to
the physical size, in millimetres, of the bore or outside diameter of the end connections
Note 1 to entry: The number following the letters DN or NPS does not represent a measurable value and is
not used for calculation purposes except where specified in the relevant standard. Prefix DN or NPS usage is
applicable to steel valves bearing PN or Class designations.Note 2 to entry: See ISO 6708 and ASME B16.34.
4 Pressure/temperature ratings
4.1 Valve ratings
4.1.1 For Class designated valves the applicable pressure/temperature ratings shall be in accordance
with those specified in the tables of ASME B16.34 for Standard Class for the applicable material
specification and the applicable Class.4.1.2 For PN designated valves the applicable pressure/temperature ratings shall be in accordance
with those specified in the tables of EN 12516-1+A1 for the applicable material specification and the
applicable PN number.4.1.3 Interpolated ratings: pressure/temperature ratings for Class 800 shall be determined by
Formula (1):1 2
pp=+ p (1)
86 9
3 3
where:
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p is the pressure, at the specified temperature, expressed in bar
1 bar = 0,1 MPa = 100 KPa and 1 MPa = 1 N/mm²
, for Class 800 rounded to the nearest 0,1 bar (10 kPa);
p is the listed pressure, at the specified temperature, for Class 600, expressed in bar;
p is the listed pressure, at the specified temperature, for Class 900 expressed in bar.
NOTE Pressure designation Class 900 is not specifically referenced in this document because this
designation is seldom used for the compact valves described herein. However, pressure/temperature ratings for
this designation are included in the reference given in 4.1.1.4.2 Temperature constraints
4.2.1 The temperature for a corresponding pressure rating is the maximum temperature of the
pressure containing shell of the valve. In general, this temperature is the same as that of the contained
fluid. The use of a pressure rating corresponding to a temperature other than that of the contained fluid
is the responsibility of the user.4.2.2 Restrictions of temperature and pressure, for example those imposed by special soft seals, special
trim materials, packing or bellows stem seals, shall be marked on the valve identification plate (see 7.4).
4.2.3 For temperatures below the lowest temperature listed in the pressure/temperature rating tables
(see 4.1), the service pressure shall be no greater than the pressure for the lowest listed temperature. The
use of valves at lower than the lowest listed temperature is the responsibility of the user. Consideration
shall be given to the loss of ductility and toughness of many materials at low temperature.
5 Design5.1 Reference design
5.1.1 The reference design (the design to be provided when the purchaser does not specify otherwise
or does not use Annex E) for sizes DN ≤ 100 is for bolted bonnet or cover construction, an outside stem
thread for gate and globe valves and, for globe valves having a conical disc. The reference design for
threaded end valves is to use taper pipe threads in accordance with ASME B1.20.1. In addition, for valves
DN ≤ 50 the reference design is to have the body and bonnet or cover to be forged material.
Valve parts are identified in Annex D.5.1.2 Other configurations and types of material may be provided when specified in accordance with
Annex E. Requirements for extended body valves are given in Annex A and those for bellows stem seals in
Annexes B and C.5.2 Flow passageway
5.2.1 The flow passageway includes the seat opening and the body ports leading thereto. The body
ports are the intervening elements that link the seat opening to the end connection, e.g. socket or flange.
5.2.2 The minimum cross-sectional area requirement for the flow passageway applies for both the valve
body ports and the seat opening in the absence of the valve obturator. The minimum flow passageway
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cross-sectional area shall not be less than that obtained using the equivalent diameters shown in Table 1
for standard bore and Table 2 for full bore valves.Table 1 — Minimum equivalent flow passageway diameter for a standard bore valve
PN designation 16, 25, 40, 63, 100 250 400
Class designa-
150, 300, 600, 800 1 500 2 500
tion
Globe or Globe and
Gate, globe or check Gate Gate
check check
Minimum equivalent diameter
DN NPS
8 6 6 5 6 5 ¼
10 6 6 5 6 4 ⅜
15 9 9 8 9 8 ½
20 12 12 9 10 9 ¾
25 17 15 14 13 13 1
32 23 22 20 18 18 1¼
40 28 27 25 25 25 1½
50 36 34 27 26 25 2
65 44 38 34 — — 2½
80 50 47 42 — — 3
100 69 63 58 — — 4
Table 2 — Minimum equivalent flow passageway diameter for a full bore valve
PN designation 16, 25, 40, 63, 100 250 400
Class designa-
150, 300, 600, 800 1 500 2 500
tion
Globe or Globe and
Gate, globe or check Gate Gate
check check
Minimum equivalent diameter
DN NPS
8 6 6 4 6 4 ¼
10 6 9 7 9 7 ⅜
15 12 12 9 10 9 ½
20 17 15 14 13 13 ¾
25 22 22 19 18 18 1
32 28 26 25 25 25 1¼
40 35 34 26 26 25 1½
50 44 38 34 35 30 2
65 50 47 42 — — 2½
80 69 63 58 — — 3
100 95 92 87 — — 4
5.3 Wall thickness
5.3.1 Except as provided in 5.3.2 and 5.3.3, the minimum wall thickness values for valve bodies and
bonnets are given in Table 3. The manufacturer, taking into account such factors as bonnet bolting
loads, rigidity needed for stem alignment, valve design detai...
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