Steel gate, globe and check valves for sizes DN 100 and smaller, for the petroleum and natural gas industries (ISO 15761:2002)

ISO 15761 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, to corresponding nominal sizes, to nominal pipe sizes (NPS) of a quarter, three eighths, half, three quarters, one, one and a quarter, one and a half, two, two and a half, three and four, and to pressure designation classes 150, 300, 600, 800 and 1500. It includes provisions for a wide range of valve characteristics and is applicable to valve end flanges in accordance with ASME B16.5 and valve body ends having tapered pipe threads to ISO 7-1 or ASME B1.20.1.

Schieber, Kugel- und Rückschlagventile aus Stahl mit Nennweiten DN 100 und kleiner für die Erdöl- und Erdgasindustrie (ISO 15761:2002)

1   Anwendungsbereich
Diese Internationale Norm legt die Anforderungen an eine Reihe von kompakten Schiebern, Kugel- und Rückschlagventilen aus Stahl für Anwendungen in der Erdöl- und Erdgasindustrie fest.
Sie umfasst Armaturen mit den:
   Nennweiten DN 8, 10, 15, 20, 25, 32, 40, 50, 65, 80 und 100;
   und den entsprechenden (Rohr-Nennweiten) NPS 1, ?, 1, 3, 1, 11, 11, 2, 21, 3 und 4;
und gilt für die Druckbezeichnungen Class 150, 300, 600, 800 und 1 500;
ANMERKUNG   Class 800 ist keine Bezeichnung für einen Class-Wert. Sie ist eine Class-Zwischengröße, die bei Armaturen in Kompaktbauweise mit Schweißmuffen- und Gewindeenden allgemein üblich ist.
Sie enthält Festlegungen für Armaturen mit folgenden Merkmalen:
   außenliegendes Spindelgewinde mit steigenden Spindeln (OS & Y) mit Nennweiten von 8   DN   100 und Druckbezeichnungen von 150   Class   1 500, einschließlich Class 800;
   innenliegendes Spindelgewinde mit steigenden Spindeln (ISRS) mit Nennweiten von 8   DN   65 und Druckbezeichnungen von Class   800;
   Schweißmuffen- oder Gewindeenden mit Nennweiten von 8   DN   65 und den Druckbezeichnungen Class 800 und Class 1 500;
   Flanschanschluss oder Anschweißende mit Nennweiten von 15   DN   100 und Druckbezeichnungen von 150   Class   1 500, ausgenommen Flanschanschluss Class 800;
   Art der Verbindung mit dem Oberteil - verschraubt, verschweißt, mit Gewinde und Dichtschweißung, und
Überwurfmutter bei Nenndruckwert Class   800;
   Gehäusesitzdurchgänge;
   Werkstoffe: wie festgelegt;
   Prüfung und Abnahme.
Diese Internationale Norm gilt für Armaturenanschlussflansche nach ASME B16.5 und Armaturengehäuseanschlüsse mit konischem Rohrgewinde nach ISO 7 1 oder ASME B1.20.1. Sie gilt für eine verlängerte Gehäusebauart mit Nennweiten von 15   DN   50 und den Druckbezeichnungen Class 800 und Class 1 500 und für die Arten von Faltenbälgen und Faltenbalg-Baugruppen, die bei Schiebern und Kugelventilen mit Nennweiten von 8   DN   50 anwendbar sind.
Sie behandelt di

Robinets-vannes, robinets a soupape et clapets de non-retour en acier de dimensions DN 100 et inférieures, pour les industries du pétrole et du gaz naturel (ISO 15761:2002)

L'ISO 15761 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 1/4, 3/8, 1/2, 3/4, 1, 1 1/4, 1 1/2, 2, 2 1/2, 3 et 4; et pour les désignations de pressions «Class» 150, 300, 600, 800 et 1500.
Elle contient des dispositions relatives aux caractéristiques d'une large gamme d'appareils de robinetterie et est applicable aux extrémités à brides des appareils de robinetterie conformes à l'ASME B16.5 et aux extrémités de corps des appareils de robinetterie à filetages coniques définis dans l'ISO 7-1 ou dans l'ASME B1.20.1.

Steel gate, globe and check valves for sizes DN 100 and smaller, for the petroleum and natural gas industries (ISO 15761:2002)

General Information

Status
Withdrawn
Publication Date
30-Apr-2004
Withdrawal Date
23-Sep-2020
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
24-Sep-2020
Due Date
17-Oct-2020
Completion Date
24-Sep-2020

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SLOVENSKI STANDARD
SIST EN ISO 15761:2004
01-maj-2004

Steel gate, globe and check valves for sizes DN 100 and smaller, for the petroleum

and natural gas industries (ISO 15761:2002)

Steel gate, globe and check valves for sizes DN 100 and smaller, for the petroleum and

natural gas industries (ISO 15761:2002)

Schieber, Kugel- und Rückschlagventile aus Stahl mit Nennweiten DN 100 und kleiner

für die Erdöl- und Erdgasindustrie (ISO 15761:2002)

Robinets-vannes, robinets a soupape et clapets de non-retour en acier de dimensions

DN 100 et inférieures, pour les industries du pétrole et du gaz naturel (ISO 15761:2002)

Ta slovenski standard je istoveten z: EN ISO 15761:2002
ICS:
23.060.01 Ventili na splošno Valves in general
75.180.20 Predelovalna oprema Processing equipment
SIST EN ISO 15761:2004 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 15761:2004
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SIST EN ISO 15761:2004
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SIST EN ISO 15761:2004
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SIST EN ISO 15761:2004
INTERNATIONAL ISO
STANDARD 15761
First edition
2002-12-15
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
naturel
Reference number
ISO 15761:2002(E)
© ISO 2002
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SIST EN ISO 15761:2004
ISO 15761:2002(E)
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ii ISO 2002 – All rights reserved
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SIST EN ISO 15761:2004
ISO 15761:2002(E)
Contents Page

1 Scope ............................................................................................................................................................... 1

2 Normative references ....................................................................................................................................... 1

3 Terms and definitions ........................................................................................................................................ 3

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 ................................................................................................................................................ 4

5.4 Valve body ..................................................................................................................................................... 5

5.5 Valve bonnet or cover .................................................................................................................................... 9

5.6 Obturator ..................................................................................................................................................... 10

5.7 Stem ............................................................................................................................................................ 11

5.8 Stem nut or stem bushing ............................................................................................................................ 12

5.9 Packing, packing chamber and gland .......................................................................................................... 13

5.10 Packing retention ....................................................................................................................................... 13

5.11 Hand wheel ................................................................................................................................................ 13

6 Materials ......................................................................................................................................................... 14

6.1 Trim materials .............................................................................................................................................. 14

6.2 Materials other than trim .............................................................................................................................. 14

7 Marking ........................................................................................................................................................... 14

7.1 Legibility ....................................................................................................................................................... 14

7.2 Body marking ............................................................................................................................................... 17

7.3 Ring joint groove marking ............................................................................................................................ 17

7.4 Identification plate marking .......................................................................................................................... 17

8 Testing and inspection .................................................................................................................................... 17

8.1 Pressure tests .............................................................................................................................................. 17

8.2 Inspection .................................................................................................................................................... 19

9 Preparation for despatch ................................................................................................................................ 19

Annexes

A Requirements for extended body gate valve bodies ....................................................................................... 21

B Requirements for valves with bellows stem seals........................................................................................... 25

C Type testing of bellows stem seals.................................................................................................................. 28

D Identification of valve parts ............................................................................................................................. 31

E Information to be specified by the purchaser .................................................................................................. 34

Bibliography........................................................................................................................................................... 36

ISO 2002 – All rights reserved iii
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SIST EN ISO 15761:2004
ISO 15761:2002(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 3.

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 International Standard may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

International Standard ISO 15761 was prepared by Technical Committee ISO/TC 153, Valves, Subcommittee SC 1,

Design, manufacture, marking and testing.

Annexes A, B and C form a normative part of this International Standard. Annexes D and E are for information only.

iv ISO 2002 – All rights reserved
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SIST EN ISO 15761:2004
ISO 15761:2002(E)
Introduction

The purpose of this International Standard 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

[1]

general construction parallels that specified by the American Petroleum Institute standard API 602 and the British

[2]
Standard BS 5352 .
[3] [4]

The form of this International Standard corresponds to ISO 6002 and ISO 10434 . However, it is not the purpose

of this International Standard to replace ISO 6002, ISO 10434 or any other International Standard not identified with

petroleum or natural gas industry applications.
ISO 2002 – All rights reserved v
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SIST EN ISO 15761:2004
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SIST EN ISO 15761:2004
INTERNATIONAL STANDARD ISO 15761:2002(E)
Steel gate, globe and check valves for sizes DN 100 and smaller, for
the petroleum and natural gas industries
1 Scope

This International Standard 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,
1/4 3/8 1/2 3/4 1 1/4 1 1/2 2 1/2
— corresponding to nominal pipe sizes NPS , , , , 1, , , 2, , 3 and 4,

and to pressure designations of Class 150, Class 300, Class 600, Class 800 and Class 1500.

Class 800 is not a listed class designation, but is an intermediate class number widely used for socket welding and

threaded end compact valves.
It includes provisions for the following valve characteristics:

— outside screw with rising stems (OS&Y), in sizes 8� DN� 100 and pressure designations

150� Class� 1500 including Class 800;

— inside screw with rising stems (ISRS), in sizes 8� DN� 65 and pressure designations of Class � 800;

— socket welding or threaded ends, in sizes 8� DN� 65 and pressure designations of Class800 and

Class 1500;

— flanged or butt-welding ends, in sizes 15� DN� 100 and pressure designations of 150� Class� 1500,

excluding flanged end Class 800;

— bonnet joint construction — bolted, welded, threaded with seal weld, and union nut for nominal pressure rating

Class ;� 800
— body seat openings;
— materials, as specified;
— testing and inspection.

This International Standard is applicable to valve end flanges in accordance with ASME B16.5 and valve body ends

having tapered pipe threads to ISO 7-1 or ASME B1.20.1. It is applicable to extended body construction in sizes

15� DN� 50 and pressure designations of Class 800 and Class 1500, and to bellows and bellows assembly

construction as may be adaptable to gate or globe valves in sizes 8� DN� 50. It covers bellows stem seal type

testing requirements.
2 Normative references

The following normative documents contain provisions which, through reference in this text, constitute provisions of

this International Standard. For dated references, subsequent amendments to, or revisions of, any of these

publications do not apply. However, parties to agreements based on this International Standard are encouraged to

investigate the possibility of applying the most recent editions of the normative documents indicated below. For

undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC

maintain registers of currently valid International Standards.
ISO 2002 – All rights reserved 1
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SIST EN ISO 15761:2004
ISO 15761:2002(E)

ISO 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances and

designation

ISO 7-2, Pipe threads where pressure-tight joints are made on the threads — Part 2: Verification by means of limit

gauges
ISO 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 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 6708:1995, Pipework components — Definition and selection of DN (nominal size)

ISO 9606-1, Approval testing of welders — Fusion welding — Part 1: Steels

ISO 9956-1, Specification and approval of welding procedures for metallic materials — Part 1: General rules for

fusion welding

ISO 9956-2, Specification and approval of welding procedures for metallic materials — Part 2: Welding procedure

specification for arc welding

ISO 9956-3, Specification and approval of welding procedures for metallic materials — Part 3: Welding procedure

tests for arc welding of steels

ISO 9956-4, Specification and approval of welding procedures for metallic materials — Part 4: Welding procedure

tests for the arc welding of aluminium and its alloys

ISO 9956-5, Specification and approval of welding procedures for metallic materials — Part 5: Approval by using

approved welding consumables for arc welding

EN 10269, Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties

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
ASME B16.10, Face-to-face and end-to-end dimensions of valves
ASME B16.34:1996, Valves — Flanged, threaded and welding end

ASME, Boiler and Pressure Vessel Code, Section IX, Qualification standard for welding and brazing procedures,

welders, brazers, and welding and brazing operators

ASTM A193, Standard specification for alloy-steel and stainless steel bolting materials for high-temperature service

1) American Society of Mechanical Engineers
2 ISO 2002 – All rights reserved
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SIST EN ISO 15761:2004
ISO 15761:2002(E)

ASTM A194, Standard specification for carbon and alloy steel nuts for bolts for high-pressure or high-temperature

service, or both

ASTM A307, Standard specification for carbon steel bolts and studs, 60 000 PSI tensile strength

3 Terms and definitions

For the purposes of this International Standard, the terms and definitions of class and nominal pipe size given in

ASME B16.34 and the following term and definition apply.
3.1
nominal size

alphanumeric designation of size for components of a pipe work system, used for reference purposes, comprising

the letters “DN” followed by a dimensionless whole number indirectly related to the physical size, in millimetres, of the

bore or outside diameter of the end connections

NOTE 1 The number following “DN” does not represent a measurable value and should not be used for calculation purposes

except where specified in the relevant standard.

NOTE 2 In those standards which use the DN designation system, any relationship between DN and component dimensions

should be given, e.g. DN/OD or DN/ID.
(Adapted from ISO 6708:1995, definition 2.1.)
4 Pressure/temperature ratings
4.1 Valve ratings
4.1.1 Applicability

The pressure/temperature ratings applicable to valves specified in this International Standard shall be in accordance

with those specified in the tables of ASME B16.34 for standard class for the applicable material specification and

class designation.
4.1.2 Interpolated ratings
Pressure/temperature ratings for Class 800 shall be determined by the equation:
1 2
p = p + p
8 6 9
3 3
where

p is the pressure at the specified temperature, expressed in bars , 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 bars;

p is the listed pressure, at the specified temperature, for Class 900, expressed in bars.

2) Pressure designation Class 800 has been added in order to identify widely used socket welding and threaded end valves

having intermediate pressure/temperature ratings. It is not available for flanged end valves.

5 2
3) 1 bar= 0,1 MPa= 10 Pa; 1 MPa = 1 N/mm
ISO 2002 – All rights reserved 3
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SIST EN ISO 15761:2004
ISO 15761:2002(E)

NOTE Pressure designation Class 900 is not specifically referenced in this International Standard 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.
5Design
5.1 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, has a conical disc. The reference design for threaded-end valves uses taper pipe

threads in accordance with ASME B1.20.1. In addition, for valves DN� 50, the reference design is to have a body

and bonnet or cover of 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 to that opening. 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. The minimum equivalent flow passageway cross-sectional area shall not be less than that

obtained using the equivalent diameters in Table 1.
5.3 Wall thickness

5.3.1 Minimum wall thickness values for valve bodies and bonnets are given in Tables 2 and 3. The manufacturer,

taking into account such factors as bonnet bolting loads, rigidity needed for stem alignment, valve design details and

the specified operating conditions, is responsible for determining if a larger wall thickness is required.

5.3.2 The valve-body specified minimum wall thickness, except for the valve end connections and body extensions

for bellows enclosures, shall be in accordance with Table 2.

5.3.3 The bonnet specified minimum wall thickness for gate or globe valves, except for the neck extension that

forms the packing chamber entryway, shall be in accordance with Table 2. The packing chamber extension shall have

a local minimum wall thickness as specified in Table 3, based on the local inside diameter of the packing and stem

hole.
4 ISO 2002 – All rights reserved
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SIST EN ISO 15761:2004
ISO 15761:2002(E)
Table 1 — Minimum diameter of equivalent flow passageway
Minimum diameter
DN NPS
Class 150, Class 300, Class 600, Class 800 Class 1500
Gate, globe or check Gate Globe
8665 1/4
10 6 6 5 3/8
15 9 9 8 1/2
20 12 12 9 3/4
25 17 15 14 1
32 23 22 20 1 1/4
40 28 27 25 1 1/2
50 36 34 27 2
65 44 38 2 1/2
80 50 47 3
100 70 63 4
Table 2 — Minimum wall thickness for valve bodies
Minimum wall thickness
DN mm NPS
Class 150, Class 300, Class 600, Class 800 Class 1500
83,1 3,8 1/4
10 3,3 4,3 3/8
15 4,1 4,8 1/2
20 4,8 6,1 3/4
25 5,6 7,1 1
32 5,8 8,4 1 1/4
40 6,1 9,7 1 1/2
50 7,1 11,9 2
65 8,4 14,2 2 1/2
80 9,7 16,5 3
100 11,9 21,3 4

NOTE Wall thickness values listed for Class 150, Class 300, and Class 600 are those required for Class 800

on the assumption that flanged end and butt-welding end valve bodies of these lower nominal pressures would

have extensions added (integral or welded) to Class800 valve bodies. See ISO6002, ISO10434, or

ASME B16.34 for flanged end or butt-welding end valves having wall thickness requirements aligned to these

lower nominal pressures.
5.4 Valve body
5.4.1 General

Requirements for a basic valve body and associated end connections are given here. See annex A for requirements

for gate valve bodies having extended ends.
ISO 2002 – All rights reserved 5
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SIST EN ISO 15761:2004
ISO 15761:2002(E)
Table 3 — Minimum wall thickness for bonnet and bellows extensions
Extension Class 150 Class 300 Class 600 Class 800 Class 1500
Inside diameter Minimum wall thickness
mm mm
15 2,8 3,0 3,6 4,0 5,3
16 2,8 3,1 3,6 4,1 5,6
17 2,8 3,2 3,7 4,3 5,8
18 2,9 3,5 3,9 4,4 5,9
19 3,0 3,8 4,1 4,8 6,1
20 3,3 4,0 4,2 4,9 6,3
25 4,0 4,8 4,8 5,8 7,1
30 4,6 4,8 4,8 5,9 8,2
35 4,8 4,8 5,1 6,4 9,7
40 4,9 5,0 5,7 6,9 10,2
50 5,5 6,2 6,3 7,4 11,6
60 5,6 6,4 6,8 8,2 13,4
70 5,6 6,9 7,4 9,1 15,8
80 5,8 7,2 8,1 10,0 17,4
90 6,4 7,4 8,8 10,4 19,1
100 6,4 7,7 9,5 11,7 20,8
110 6,4 8,1 10,3 12,8 22,9
120 6,6 8,6 10,9 13,6 24,8
130 7,1 8,8 11,3 14,6 26,5
140 7,1 9,2 12,0 15,5 28,3
NOTE For bellows extension, see B.4.
5.4.2 Socket-welding ends

5.4.2.1 The socket bore axis shall coincide with the end entry axis. Socket end faces shall be perpendicular to the

socket bore axis. The socket bore diameter and its depth shall be in accordance with Table 4.

Table 4 — Socket diameter and depth
a b
Diameter Depth
DN NPS
814,1 10 1/4
10 17,6 10 3/8
15 21,7 10
1/2
20 27,0 13 3/4
25 33,8 13 1
32 42,5 13
1 1/4
40 48,6 13 1 1/2
50 61,1 16 2
65 73,8 16 2 1/2
+0,5
The applicable diametral tolerance is .
The depth dimension is a minimum value.
6 ISO 2002 – All rights reserved
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SIST EN ISO 15761:2004
ISO 15761:2002(E)

5.4.2.2 The minimum socket wall thickness, extending over the full socket depth, shall be in accordance with

Table 5.
Table 5 — Socket and threaded end minimum wall thickness
Minimum wall thickness
DN mm NPS
Class 800 Class 1500
83,3 4,1 1/4
10 3,6 4,3 3/8
15 4,1 5,3 1/2
20 4,3 6,1 3/4
25 5,1 6,9 1
32 5,3 8,1 1 1/4
40 5,8 8,9 1 1/2
50 6,9 10,7 2
65 7,9 12,4 2 1/2

5.4.2.3 End-to-end dimensions for socket welding end valves shall be established by the manufacturer.

5.4.3 Threaded ends

5.4.3.1 The threaded end thread axis shall coincide with the end entry axis. The minimum wall thickness at the

threaded end shall be in accordance with Table 5. An approximate 45 lead-in chamfer, having an approximate depth

of one-half the thread pitch, shall be applied at each threaded end.

5.4.3.2 The end threads shall be taper pipe threads meeting the requirements of ASME B1.20.1. When specified in

the purchase order, taper pipe threads in accordance with ISO 7-1 may be substituted.

5.4.3.3 Threads shall be gauged in accordance with ISO 7-2 or ASME B1.20.1, as applicable.

5.4.3.4 End-to-end dimensions for threaded end valves shall be established by the manufacturer.

5.4.4 Flanged ends

5.4.4.1 End flanges shall comply with the dimensional requirements of ASME B16.5. Unless otherwise specified,

raised face end flanges shall be provided.

This International Standard does not provide for flanged ends for Class 800 valves.

5.4.4.2 End flanges and bonnet flanges shall be cast or forged integral with the body, except that cast or forged

flanges attached by full penetration butt-welding or by inertia welding may be used. A purchaser requiring an integral

flange body shall so specify. When a flange is attached by welding, the welding operator and welding procedure shall

be qualified in accordance with ISO 9606-1 and ISO 9956-1 to ISO 9956-5, or ASME-BPVC, Section IX. Alignment

rings, integral or loose, used as a welding aid shall be completely removed following welding, while care shall be

taken that the minimum wall thickness is maintained. Heat treatment following welding, to ensure that the valve body

and flange materials are suitable for the full range of service conditions, shall be performed as required by the

material specification.

5.4.4.3 Face-to-face dimensions for flanged end valves, Class150, Class300 and Class600, shall be in

accordance with ISO 5752 — Basic Series 3, 4 and 5 for gate valves, and 5, 10 and 21 for globe and check valves —

except that the applicable tolerance shall be in accordance with Table 6. For Class 1500, the face-to-face dimensions

shall be as shown in Table 6.
ISO 2002 – All rights reserved 7
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SIST EN ISO 15761:2004
ISO 15761:2002(E)
Table 6 — Face-to-face dimensions for Class 1500
Dimensions
DN NPS
15 216 1/2
20 229 3/4
25 254 1
32 279 1 1/4
40 305 1 1/2
50 368 2
65 419 2 1/2
80 470 3
100 546 4
The applicable length tolerance shall be ± 1,6 mm (see 5.4.4.3).
NOTE These dimensions and tolerances are in accordance with ASME B16.10.
5.4.5 Butt-welding ends

5.4.5.1 Unless otherwise specified by the purchaser, butt-welding ends shall be in accordance with Figure 1 and

Table 7.

The inside and outside surfaces of valve welding ends shall be machine-finished overall. The contour within the

envelope is at the option of the manufacturer unless specifically ordered otherwise.

Intersections should be slightly rounded.

For nominal outside diameters and wall thickness of standard steel pipe, see ISO 4200.

5.4.5.2 End-to-end dimensions for butt-welding end valves shall be established by the manufacturer.

5.4.6 Body seats

5.4.6.1 Integral body seats are permitted in austenitic stainless steel bodies. An austenitic stainless steel or a hard

facing material may be weld-deposited either directly on a valve body or on a separate body seat ring. Weld-

deposited seating surfaces shall have a minimum finished facing material thickness of 1mm. Body seating surfaces

shall not have sharp corners, e.g. corners with an edge disposed to cause damage in conjunction with gate or disc

seating surfaces at either the inner or outer seat circumference.

5.4.6.2 Except as provided in 5.4.6.1, valve bodies shall have separate removable seat rings that are threaded,

rolled or pressed in place, however, rolled or pressed seat rings shall not be used with globe valves unless they are

seal welded. Sealing compounds or greases shall not be used when assembling seat rings, however, a light lubricant

having a viscosity no greater than kerosene may be
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