1、UDC 621.643.414.061 DEUTSCHE NORM January 1985 - DIN 7631 Compression couplings with spherical liner Straight compression couplings Rohrverschraubungen mit Kugelbuchse; Verbindungsstutzen Supersedes December 1969 edition. Beuth Verlag GmbH. Berlin 30, has exclusive sale rights for German Standards (
2、DIN-Normen) 10.85 DIN 763 1 Engl. Price group 5 Sales No. 0105 In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used throughout as the decimal marker. Dimensions in mm 1 Field of application This standard applies to
3、 straight compression couplings (hereinafter briefly referred to as couplings) 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 Standard material: 9S
4、MnPb 28 K in accordance with DIN 1651, crack-proof. Other materials, which can be selected as in DIN 3859, shall be specified in the standard designation by appending the appropriate material symbol. 5 Finish Standard finish: A3C finish in accordance with DIN 267 Part 9. Other possible types of fini
5、sh, which can be selected as in DIN 3859, shall be specified in the standard desig nation by appending the appropriate symbol. Continued on pages 2 and 3 Page 2 DIN 7631 2 Dimensions, designation Details not specified shall be selected as appropriate; only the dimensions specified are to be adhered
6、to. Details per- taining to the finish shall be given in accordance with IS0 1302, and for R, and R, in accordance with DIN 4768 Part 1. / R, 100, (?= 6 25) As in DIN 3853 1 1 Designation of a straight compression coupling of standard material, for an external pipe diameter of 10 mm: Coupling DIN 76
7、31 - 10 Designation of a straight compression coupling 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 mm (4-5): Coupling DIN 7631 - 4 - 5 - CuZn35Ni2 - B 2 A Width across flats 5 11 12 14 17 19 24 27 32 41 46 55
8、DIN 7631 Page 3 Standards referred to DIN 267 Part 9 Fasteners; technical delivery conditions; electroplated components DIN 1651 Free cutting steels; technical delivery conditions DIN 3853 Soldered and unsoldered compression couplings; compression ends for union nuts, design sheet DIN 3859 Compressi
9、on couplings; technical delivery conditions DIN 3863 Compression couplings with spherical liner for brazing and butt welding; spherical liners, design and bore type Y DIN 4768 Part 1 Determination of roughness values Ra, R, R, using electric stylus instruments; principles IS0 1302 Technical drawings
10、; method of indicating surface texture on drawings Previous editions DIN 7631: 12.69 Amendments The following amendments have been made in comparison with the December 1969 edition: see Explanatory notes. Explanatory notes Whilst applying the standards for compression couplings, a variety of difficu
11、lties were encountered with respect to the assembly of the couplings. This applied particularly to ring type nipples and banjo bolts. Whilst preparing the standards, Working Group Kugelbuchsverschraubungen of Technical Committee ohrverschraubungen decided to withdraw the December 1969 edition of eac
12、h 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 one hand it was felt that there was no demand for these standards and on the other, that the application of these standards no longer conf
13、ormed 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 basis of pressure. 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. 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. The title of the standard has been amended. International Patent Classification F 16 L 19/02
