1、UDC 621.643.414.063 DEUTSCHE NORM January 1985 I I Compression couplings with spherical liner Equal crosses I 7640 Rohrverxhraubungen mit Kugelbuchse; Kreuzverbindungsstutzen Supersedes January 1970 edition. Beuth Verlag GmbH. Berlin 30, has exclusive sale rights for German Standards (DIN-Normen) 10
2、.85 In keeping with current practice in standards published by the International Organization for Standardization (Ise), a comma has been used throughout as the decimal marker. Dimensions in mm 1 Field of application This standard applies to equal crosses (hereinafter briefly referred to as crosses)
3、 which are used for pipe joint assemblies with spherical liner as specified in DIN 3863. 2 Dimensions, designation (See page 2.) 3 Technical delivery conditions In accordance with DIN 3859. 4 Material C 15 in accordance with DIN 1652. Other materials, which can be selected as in DIN 3859, shall be s
4、pecified in the standard designation by appending the appropriate material symbol. 5 Finish Standard finish: A 3 C finish in accordance with DIN 267 Part 9. Other possible types of finish which can be selected as in DIN 3859, shall be specified in the standard desig- nation by appending the appropri
5、ate symbol. Continued on pages 2 and 3 DIN 7640 Engl. Price group 5 Sales No. 0105 Page 2 DIN 7640 Compression end 2 Dimensions, designation Details not specified shall be selected as appropriate; only the dimensions specified are to be adhered to. Details per- taining to the finish shall be given i
6、n accordance with IS0 1302, and for R, and R, in accordance with DIN 4768 Part 1. t- 1 1 R, 100, (t/= G25) I Bore Width type) across o 0.05 F DIN 3853 as in Thread size d7 M10X1 M 12 X 1,5 M 14 X 1,5 M 16 X 1,5 M 18 X 1,5 Designation of an equal cross of standard material, for an external pipe diame
7、ter of 10 mm: Cross DIN 7640 - 10 Designation of an equal cross of the selected material CuZn35Ni2 (material number 2.0540) and with the selected finish B 2 A, for external pipe diameters of 4 and 5 mrn (4-5): Cross DIN 7640 - 4-5 - CuZn35Ni2 - B 2A U flats 3 dl0 dl 1 dl 2 I r S + 0.1 * 0.2 H14 O f
8、0.3 6 3 8 8 15 2 9 7 4 9 10 19 2.5 12 7 6 11 11 21 2.5 12 a 8 13 13 22 3 14 8 10 15 15 24 3 17 External pipe diam- eter 4-5 6 8 10 12 1) Bore type U given in the above table will be included in the pending revision of DIN 3863. These couplings may also be produced by special arrangement with bore ty
9、pe Y as in DIN 3863. Then, for example, the designation shall read: Cross DIN 7640 - 10 Y DIN 7640 Page 3 Standards referred to DIN 267 Part 9 Fasteners; technical delivery conditions; electroplated components DIN 1652 DIN 3853 DIN 3859 DIN 3863 DIN 4768 Part 1 IS0 1302 Cold drawn unalloyed steel; t
10、echnical delivery conditions Soldered and unsoldered compression couplings; compression ends for union nuts, design sheet Compression couplings; technical delivery conditions Compression couplings with spherical liner for brazing and butt welding; spherical liners, design and bore type Y Determinati
11、on of roughness values Ra, R, R, with electric stylus instruments; principles Technical drawings; method of indicating surface texture on drawings Previous editions DIN 4613: 12.31; DIN 7620: 07.36, 12.41; DIN 7640: 01.70 Amendments The following amendments have been made in comparison with the Janu
12、ary 1970 edition: see Explanatory notes. Explanatory notes Whilst applying the standards for compression couplings, a variety of difficulties were encountered with respect to the assembly of the couplings. This applied particularly to ring type nipples and banjo bolts. Whilst preparing the standards
13、, Working Group Kugelbuchsverschraubungen of Technical Committee Rohrverschraubungen decided to withdraw the December 1969 edition of each of the following standards: DIN 7632 Part 2; DIN 7634; DIN 7635; DIN 7636; DIN 7641; DIN 7642 Part 2; DIN 7647 Part 2. They were then withdrawn in 1984. On the o
14、ne hand it was felt that there was no demand for these standards and on the other, that the application of these standards no longer conformed to the present state of technology. The series symbol LL has been dropped as these compression couplings could not be allocated to a particular series on the
15、 basis of pressure. It was not considered necessary to compile standards for every external pipe diameter and felt that the 3 mm external pipe diameter could be dispensed with. Compression couplings for pipes with external diameters of 4 and 5 mm have been given the same dimensions and the same symbol for the designation. The title of the standard has been amended. International Patent Classification F 16 L 19/02
