1、BRITISH STANDARD Gas welding equipment Quick-action coupling with shut-off valves for welding, cutting and allied processes The European Standard EN 561:2002 has the status ofa British Standard ICs 23.040.70 BS EN 56 1 :2002 WkNb A%“ U- rn% E rn NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED
2、BY COPYRIGHT LAW $ present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations represente
3、d on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled ?International Standards Correspondence Index?, or
4、by using the ?Search?faci1ity ofthe BSI Electronic Catalogue or ofBritish Stan dards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for their correct application. Compliance with a British Standard does not ofitself confer immun
5、ity from legal obligations. This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 10 July 2002 Summary of pages This document comprises a front cover
6、, an inside front cover, the EN title page, pages 2 to 14, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd.No. I Date I Comments O BSI 1 O July 2002 ISBN O 580 40062 X EUROPE
7、AN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 561 June 2002 ICs 23.040.70 Supersedes EN 561 :I 994 English version Gas welding equipment - Quick-action coupling with shut-off valves for welding, cutting and allied processes Matriel de soudage aux gaz - Raccords rapides obturation pour le soudage, c
8、oupage et les techniques con nexes Gasschweigerte - Schlauchkupplungen mit selbstttiger Gassperre fr Schweien, Schneiden und verwandte Prozesse This European Standard was approved by CEN on 25 March 2002. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the co
9、nditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. This European Standard exists in three
10、 official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austri
11、a, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Manage
12、ment Centre: rue de Stassart, 36 B-1050 Brussels O 2002 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 561:2002 E EN 561:2002 (E) Contents page Foreword 3 Introduction . 4 1 Scope 4 2 Normative references 4 3 Terms and definitions
13、 4 4 Types of couplings 5 5 Installation 5 6 Design requirements . 5 7 Working requirements . 7 8 General test conditions . 8 9 Test procedures . II 10 Marking . 13 Bibliography 14 2 EN 561:2002 (E) Foreword This document EN 561 :2002 has been prepared by Technical Committee CEN/TC 121 “Welding“, th
14、e secretariat of which is held by DS. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2002, and conflicting national standards shall be withdrawn at the latest by December 2002. This docu
15、ment supersedes EN 561 :I 994. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemb
16、ourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. 3 EN 561:2002 (E) Introduction Quick-action couplings with shut-off valves are used in equipment for gas welding, cutting and allied processes to connect the hoses used between the regulator and the torch,
17、 either to one another or to the regulators and the torches themselves. These couplings are fitted with shut-off devices that interrupt the gas flow when the two elements are disconnected, so that coupling and uncoupling operations can be performed manually while the equipment is under pressure. 1 S
18、cope This European Standard defines the specifications and the type tests for quick-action couplings with shut-off valves. It applies to quick-action couplings used between the regulator and the torch in equipment for gas welding, cutting and allied processes. This standard applies to cases where th
19、ese couplings are used with hoses according to EN 559 or threaded unions according to EN 560. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and
20、the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (inc
21、luding amendments). prEN 730-1, Gas welding equipment - Safety devices - Part I: Incorporating a flame (flashback) arrestor. EN 29090, Gas tightness of equipment for gas welding and allied processes (IS0 9090: 1989). EN 29539, Materials for equipment used in gas welding, cutting and allied processes
22、 (IS0 9539:1988). IS0 61 50, Pneumatic fluid power - Cylindrical quick-action couplings for maximum working pressures of 10 bar, 16 bar and 25 bar (I MPa, 1,6 MPa and 2,5 MPa) - Plug connecting dimensions, specifications, application guidelines and testing. 3 Terms and definitions For the purposes o
23、f this European Standard, the following terms and definitions apply. 3.1 quick-action coupling with shut-off valve device enabling a rapid coupling or uncoupling under pressure of equipment and/or hoses, and preventing the mutual connection of two lines containing incompatible gases (e.g. oxygen and
24、 fuel gas) 3.2 elements device comprising two elements, a male and a female element, of which the female element is fitted with an automatic shut-off system which prevents gas leakage when the two elements are uncoupled 4 EN 561:2002 (E) 4 Types of couplings This standard deals with three types of q
25、uick-action couplings with shut-off valves, according to the gases for which they are intended. These three types are the following: a) type O - oxygen; b) type F -fuel gas; c) type N - other gases specific for welding processes 5 Installation The quick-action couplings with shut-off valves shall be
26、 installed so that the element with the shut-off device is located upstream in terms of the gas flow from the source. 6 Design requirements 6.1 Dimensions, non-interchangeability and interchangeability In order to ensure that: a) b) elements of different types, and; elements of different types and c
27、ouplings for compressed air, according to IS0 6150, are not interchangeable, quick-action couplings with shut-off valves according to this standard shall have the dimensions specified in Figure 1 and Table 1 for couplings of types O, F and N. 5 EN 561:2002 (E) Dimensions and tolerances of coaxiality
28、 and perpendicularity in millimeters, surfaces roughness values in micrometers 26 O a The minimum hardness of the male element surface is 270 HV10 for the minimum length of 15,2 mm. The internal diameter C shall be for a minimum length of 20 mm. b Figure 1 -Male element Table 1 - Dimensions of male
29、element Dimensions in millimeters a Diameter C shall be observed over a length of 20 mm. The dimensions and fabrication details not specified in Figure 1 and Table 1 are left to the discretion of the manufacturer, with the proviso that quick-action couplings with shut-off valves of the same type sha
30、ll be interchangeable, regardless of their manufacturer. 6.2 Configuration The shut-off system shall be located in the female element of the quick-action coupling. 6.3 Coupling and uncoupling The choice of the coupling and uncoupling means is left to the discretion of the manufacturer. 6 EN 561:2002
31、 (E) Coupling and uncoupling shall be achieved with ease and shall not require the use of tools. It shall not be possible to disengage the two elements by: a) either a simple rotation of one element against the other; b) or the application of a longitudinal traction force of less than 1 kN. Under se
32、rvice conditions, as defined by the manufacturer, no undesired uncoupling shall occur. The opening and closure of the shut-off system shall occur automatically. 6.4 Connections The outside-threaded connections shall conform with the specifications given in EN 560. A right-hand thread shall be used f
33、or couplings of types O and N and a left-hand thread shall be used for couplings of type F. 6.5 Materials The materials used for the construction of these couplings shall conform with the requirements given in EN 29539. 6.6 Surface protection Unless otherwise protected from external damage by mechan
34、ical means, the male element shall be constructed from material of a surface hardness not less than 270 HV10 (This specification refers to the surface hardness of the standardized external profile over a length of 15,2 mm.). 7 Working requirements 7.1 Pressure resistance Quick-action couplings with
35、shut-off valves shall be designed for a maximum working pressure of 2 MPa (20 bar). When tested under the conditions given in 9.2, they shall withstand: a) a test pressure of 4 MPa (40 bar) without permanent deformation, and; b) a test pressure of 6 MPa (60 bar) without rupture. 7.2 Gas tightness 7.
36、2.1 General requirements The general requirements for gas tightness given in EN 29090 shall be satisfied. 7.2.2 Specific requirements During tests performed according to 9.3, the measured leakage rate, in both the coupled and the uncoupled position, shall not exceed 10 cm3/h. 7.3 Pressure drop At th
37、e maximum operating pressure and the flow rate specified by the manufacturer, the pressure loss introduced by the quick-action couplings with shut-off valves shall not exceed 10 % of the maximum operating pressure specified. 7.4 Resistance to flame flash-back After having been submitted to one flash
38、-back in accordance with the conditions specified in 9.4, quick-action couplings with shut-off valves shall continue to conform with the requirements specified in clause 8. 7 EN 561:2002 (E) 7.5 Resistance to tensile load When tested under the conditions indicated in 9.5, the quick-action couplings
39、with shut-off valves shall: a) remain suitable for normal service and fulfil the test requirements specified in this European Standard, after having been submitted to an axial load of 600 N, and; b) remain coupled and gas tight after having been submitted to an axial load of 1 kN. 7.6 Resistance to
40、radial loads When tested under conditions indicated in 9.6, the quick-action couplings with shut-off valves shall: a) remain suitable for normal service and fulfil the test requirements specified in this standard, after having been submitted to a radial load of 1 kN, and; b) remain coupled and gas t
41、ight after having been submitted to a radial load of 2 kN. 7.7 Endurance When tested under the conditions specified in 9.7, the quick-action couplings with shut-off valves shall remain gas tight after they have been submitted to a minimum of 1 O00 couplinghncoupling cycles at a maximum working press
42、ure (see 7.2). 7.8 Other functions In cases where a quick-action coupling with shut-off valve is associated with any other function than those specified in this standard, it shall comply with the requirements of clauses 6 and 7 and shall then be tested in accordance with clause 8 and 9 after it has
43、met the requirements necessary to perform the other function. 8 General test conditions 8.1 General The tests described hereunder are the type tests Unless otherwise specified, they shall be performed at an ambient temperature of (23 I2)“C using oil-free air or in nitrogen. The pressure resistance t
44、est shall be performed under hydraulic pressure. Eight samples of the quick-action couplings with shut-off valves shall be tested. The two elements of each of these samples shall be carefully marked to ensure that all tests are performed using the same pair of elements. Figures 2 to 4 show the princ
45、iple of the tensile load test and examples of the test rigs for gas tightness and resistance to radial loads. 8 EN 561:2002 (E) Dimensions in millimetres 5 Key 1 2 3 4 Coupled test coupling 5 Centreline of locking device 6 Rod connected to the male element Fixture to hold female element Pressure (2
46、MPa (20 bar); 0,02 MPa (0,2 bar) 40 N load perpendicular to the coupling centreline Figure 2 -Test rig for the gas tightness test in the coupled position internal pressure 2 MPa (20 bar) 1 1 Key 1 Threaded or tapped parts f Tensile load Figure 3 - Principle of the tensile load test 9 EN 561:2002 (E)
47、 Dimensions in millimetres 4- 3 c- ? 1 Load 2 Coupling to be tested 3 4 support 5 Loading counter plate 6 7 Circulate gas at a pressure of 2 MPa (20 bar) Rubber plate (chlorophrene, shore hardness 80 IRHD) Steel base of the support Figure 4 - Rig for testing under radial loads 8.2 Test sequence Each
48、 of the eight samples shall be submitted to the tests described in clause 9, as indicated by the crosses in Table 2. The tests shall be performed in the sequence shown in Table 2 with the test series being performed in alphabetical order; one sample shall be used for each test series A, B, and C and
49、 five samples shall be used for test series D. 10 EN 561:2002 (E) Table 2 - Test sequence and test series Subclause Test Test sequence Requirements I Test I A I B pressure resistance 7.1 9.2 x- interchangeability 6.1 8.3 - X gas tightness 7.2 9.3 - X pressure drop 7.3 - flame flash-back tensile load 600 N 7.5 a) 1 kN I 7.5 b) I 9.5 I - I x radial load 1 7.6 a) 19:; 1-1: 1kN 2 kN 7.6 b) - end u rance 7.7 9.7 - - gas tightness 7.2 9.3 - X series C D X - X X - X X - X 8.3 Test for interchangeability The test for interchangeability shall be performed on the sa
