BS ISO 5752:2021 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; 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.]
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: t is intended that all equipment of the same nominal size (DN or NPS)(3.1) designated by thesame 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 isto 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 beenadded,and “Class” has been integrated into the definition.]
face-to-face dimensionFTF
<straight pattern valves> distance between the two planes perpendicular to the valve axis located atthe extremities of the body end ports
Note 1 to entry: Dimensions are expressed in millimetres.Note 2 to entry: See Figures 1 to 5 and Figure A.1.
centre-to-face dimensionCTF
<angle pattern valves> distance, between the plane located at the extremity of either body end port andperpendicular to its axis and the other body end port axis
Note 1 to entry: Dimensions are expressed in millimetres.Note 2 to entry: See Figures 1 to 5 and Figure A.1.
4Dimensions and tolerances
The basic series of FTF and CTF dimensions, expressed in millimetres, shall be as given in Table 1.Table 1 is a summary of the dimensions in Tables 2 to 19 giving the origin of each series and should bereferred to when considering valve types not covered by this document. Each particular column doesnot necessarily include all the values of the relevant basic series. See Annex C for information as to theorigin of each basic series.
Tables 17 and 18 cover butterfly check or wafer check valves which are retained in the piping by boltingthat spans the two adjacent flanges, however these valves may alternately be furnished with full endflanges.Check valves shown as ‘long pattern’ shall be furnished with full end flanges only.
The face-to-face and centre-to-face dimensions, as appropriate for the types of valves covered by thisdocument, shall be in accordance with Tables 2 to 19, and the tolerances shall be in accordance withTables 20and 21.Annex A includes additional information on face-to-face and centre-to-face dimensionswhere ring joint facing is used and shall be followed.
Tolerances on FTF and CTF dimensions as shown in Figure 1 are given in Table 20.Both tolerances shallbe fulfilled.BS ISO 5752 pdf download.