1、UDC 621.643.414.069 DEUTSCHE NORM January 1985 Compression couplings with spherical liner Male studed banjo bolts for ring type nipples DIN - 7644 Rohrverschraubungen mit Kugelbuchse; Hohlschraubenstutzen fur einen Ringstutzen Supersedes December 1969 edition. Beuth Verlag GmbH. Berlin 30, has exclu
2、sive sale rights for German Standards (DIN-Normen) 10.85 DIN 7644 Engl. Price group 5 Sales No. O105 In keeping with current practice in standards published by the International Organization for Standardization IlSO), a comma has been used throughout as the decimal marker. Dimensions in mm 1 Field o
3、f application This standard applies to male studed banjo bolts which are used in conjunction with compression couplings with spherical liner as specified in DIN 3863 and ring type nipples as specified in DIN 7642 Part 1 (at present at the stage of draft). 2 Dimensions, designation (See page 2.) 3 Te
4、chnical delivery conditions In accordance with DIN 3859. 4 Material Standard material: 9SMnPb28 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 Sta
5、ndard finish: A3C 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 appropriate symbol. Continued on pages 2 to 4 Page 2 DIN 7644 2 Dimensions, designation Details not speci
6、fied shall be selected as appropriate; only the dimensions specified are to be adhered 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. 4s in DIN 3853 t n Other dimensions and details as for figure 1. I I Thread
7、runout x shall not reach as far as the cross hole, 115 Figure 1. Banjo bolt with four holes Figure 2. Banjo bolt with three holes Designation of a male studed banjo bolt for an external pipe diameter of 10 mm: Banjo bolt DIN 7644 - 10 The standard design of male studed banjo bolts of standard materi
8、al for external pipe diameters of 4 and 5 mm shall be supplied with either two or three holes spaced uniformly around the periphery, at the manufacturers discretion, with dimension p3 (centre line distance of hole) and d28 (hole diameter) as illustrated in figure 2. The standard design of male stude
9、d banjo bolts for external pipe diameters of 6 mm and above shall have 4 holes, as illustrated in figure 1. Subject to agreement, they may also be supplied with 3 holes, with dimensionsp3 and d28 as illustrated in figure 2. Designation of a male studed banjo bolt of standard material, with 3 holes (
10、31, for an external pipe diameter of 10mm: Banjo bolt DIN 7644 - 10 - 3 In cases where the male studed banjo bolts ordered are to be provided with an extra-long screw thread (for example for screwing into copper-zinc alloy or into aluminium alloy fittings or pipes), the dimensions given for the spec
11、ial design (S) shall apply. Designation of a male studed banjo bolt of standard material, with an extra-long screw thread (S) and 3 holes (3), for an external pipe diameter of 1 O mm: Banjo bolt DIN 7644 - 10S3 In cases where the material, the finish and also the number of holes and the length of sc
12、rew thread shall be subject to agreement, the standard designation shall be as follows. Designation of a male studed banjo bolt of the selected material CuZn35Ni2 (material number 2.0540) and with the selected finish B 2 A, with an extra-long screw thread (S), with 4 holes (4). for external pipe dia
13、meters of 4 and 5 mm (4-5): Banjo bolt DIN 7644 - 4-5 C 4 - CuZn35Ni2 - B 2 A DIN 7644 Page 3 (D t 7 t m 20 t I- a I- ?- s EN 1 x I- Co 24 3 I Ln 7 7 Co m m - 4 in - I- - 24 N m 8 I 4 z m m LO * M 1% I v? Co - I- z “/z 3 t * lm O t - Io !? I * /p 0 - v! 7 X 4 I N - I In 7 X a N I ? c X 8 I 0- X in t
14、 7 I O (D I I N t I I R O m I I - N O t O ro N I- in Co Q; I I 24 a m 81% I 7 7 v? X I 7 8 a) cy - Page 4 DIN 7644 Standards referred to DIN 267Part9 DIN 1651 DIN 3853 DIN 3859 DIN 3863 DIN 4742 Part 1 DIN 4768 Part 1 IS0 1302 Fasteners; technical delivery conditions; electroplated components Free c
15、utting steels; technical 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 ty
16、pe Y (at present at the stage of draft) Compression couplings with spherical liner; brazing nipples Determination of roughness values Ra, R, R, with electric stylus instruments; principles Technical drawings; method of indicating surface texture on drawings Previous editions DIN 7644: 12.69 Amendmen
17、ts 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 difficulties were encountered with respect to the assembly of the couplings. This applied particular
18、ly to ring type nipples and banjo bolts. W hi Ist preparing the standards, Work i ng Group Kugelbuchsverschraubungen of Tech n cal Committee ohrwerschraubungen 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; D
19、IN 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 conformed to the present state of technology. The series symbol LL has been dropped as these
20、 compression couplings could not be allocated to a particular series on the basis of pressure. In the case of banjo bolts, there is now a choice between two and three holes for external pipe diameters of 4 and 5 mm, and between three and four holes for diameters of 6 mm and above. Dimension d27 has
21、been amended. Banjo bolts 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 status of the standard is no longer that of a preliminary standard; the title of the standard has been amended. International Patent Classification F 16 L 19/02
