BS ISO 5752:2021 pdf download

BS ISO 5752:2021 pdf download.Metal valves for use in flanged pipe systems — Face-to-face and centre-to-face dimensions
1 Scope
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; DN 15; DN 20; DN 25; DN 32; DN 40; DN 50; DN 65; DN 80; DN 100; DN 125; DN 150; DN 200;DN 250; DN 300; DN 350; DN 400; DN 450; DN 500; DN 600; DN 650; DN 700; DN 750; DN 800;DN 900; DN 1 000; DN 1 050; DN 1 200; DN 1 400; DN 1 600; DN 1 800; DN 2 000;
— corresponding to nominal sizes NPS: ⅜; ½; ¾; 1; 1 ¼; 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 DN 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 .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
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 DN or NPS followed by a dimensionless number which is indirectly related to the physical size, (in millimetres for DN and in inches for NPS), of the bore or outside diameter of the end connections Note 1 to entry: The number following DN or NPS does not represent a measurable value and is not used for calculation purposes except where specified in a product standard. [SOURCE: ISO 6708:1995, 2.1, modified — The terms “nominal size” and “NPS” have been added, “NPS” has been integrated into the definition and the Note 2 to entry has been deleted.]
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) (3.1) 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.]