BS EN ISO 2376:2019 pdf download.Metal valves for use in flanged pipe systems – Face-to-face and centre-to-face dimensions.
This document specifies the basic series of face-to-face (FTF) and centre-to-face (CTF) dimensions for two-way metal valves of the gate, globe, diaphragm, ball, plug, butterfly design types used as isolating and check valves in flanged pipe systems. Each basic series of face-to-face and centre-to-face dimensions can be used as required with flanges of mating dimensions conforming to the equivalent EN or ASME flange series.
This document covers valves with the following PN, Class, DN and NPS values:
— PN 2,5; PN 6; PN 10; PN 16; PN 25; PN 40; PN 63; PN 100; PN 160; PN 250; PN 320; PN 400;
— Class 125; Class 150; Class 250; Class 300; Class 600; Class 900; Class 1 500; Class 2 500;
— DN 10; ON 15; DN 20; DN 25; DN 32; DN 40; DN 50; DN 65; ON 80; DN 100; ON 125; DN 150; DN 200; DN 250; ON 300; DN 350; DN 400; ON 450; DN 500; ON 600; DN 650; ON 700; DN 750; DN 800; DN 900; DN 1 000; DN 1 050; DN 1 200; ON 1 400; DN 1 600; DN 1 800; ON 2 000;
— corresponding to nominal sizes NPS: %; ½; ¾; 1; 1 Ye; 1 ½; 2; 2 ½; 3; 4; 5; 6; 8; 10; 12; 14; 16; 18; 20; 24; 26; 28; 30; 32; 36; 40; 42; 48; 56; 64; 72; 80.
NOTE See Annex B for the relationship between ON and NPS.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.orgJobp
— IEC Electropedia: available at http://wwweItrupedia.orgj
3.1 DN NPS nominal size alphanumeric designation of size for components of a pipework system, which is used for reference purposes, comprising the letters ON or NPS followed by a dimensionless number which is indirectly related to the physical size, (in millimetres for ON and in inches for NPS), of the bore or outside diameter of the end connections.
3.2
PN
Class
nominal pressure
numerical designation relating to pressure that is a convenient rounded number for reference purposes. and which comprises the letters “PN or Class” followed by the appropriate reference number
Note 1 to entry: It is intended that all equipment of the same nominal size (DN or NPS) (ii) designated by the same PN number or Class number shall have compatible mating dimensions.
Note 2 to entry: The maximum allowable pressure depends on materials, design and working temperature, and is to be selected from the tables of pressure/temperature ratings given in the appropriate standards.
[SOURCE: ISO 7268:1983, Clause 2, modified — The terms “nominal pressure” and Class” have been added, and Class” has been integrated into the definition.]
3.3 face-to-face dimension FTF <straight pattern valves> distance between the two planes perpendicular to the valve axis located at the extremities of the body end ports
Note ito entry: Dimensions are expressed in millimetres.
Note 2 to entry: See Elguresi. to and Figure Al.
3.4 centre-to-face dimension CTF <angle pattern valves> distance, between the plane located at the extremity of either body end port and perpendicular to its axis and the other body end port axis
Note ito entry: Dimensions are expressed in millimetres.
Note 2 to entry: See Figures Ito and Figure A.1.
4 Dimensions and tolerances
The basic series of FTF and CTF dimensions, expressed in millimetres, shall be as given in Tablei..
Table I is a summary of the dimensions in Tables 2 to 19 giving the origin of each series and should be referred to when considering valve types not covered by this document. Each particular column does not necessarily include all the values of the relevant basic series. See Annex C for information as to the origin of each basic series.
Tables 17 and 1 cover butterfly check or wafer check valves which are retained in the piping by bolting that spans the two adjacent flanges, however these valves may alternately be furnished with full end flanges. Check valves shown as ‘long pattern’ shall be furnished with full end flanges only.BS EN ISO 2376 pdf download.
