BS ISO 5752:2021 pdf download – Metal valves for use in flanged pipe systems — Face-to-face and centre-to-face dimensions.
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.] 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 1 to entry: Dimensions are expressed in millimetres. Note 2 to entry: See Figures 1 to 5 and Figure A.1. 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 1 to entry: Dimensions are expressed in millimetres. Note 2 to entry: See Figures 1 to 5 and Figure A.1.
4 Dimensions 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 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 18 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. The face-to-face and centre-to-face dimensions, as appropriate for the types of valves covered by this document, shall be in accordance with Tables 2 to 19, and the tolerances shall be in accordance with Tables 20 and 21. Annex A includes additional information on face-to-face and centre-to-face dimensions where 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 shall be fulfilled.
BS ISO 5752:2021 pdf download – Metal valves for use in flanged pipe systems — Face-to-face and centre-to-face dimensions
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