1、UDC 621-762 : 389.171 DEUTSCHE NORMEN September 1954 Seals and Packings Stuffing Box Diameters and Related Packing Widths Design Sheet EN I 3780 Dichtungen; Stopfbuchsen-Durchmesser und zugehrige Packungsbreiten, Konstrulctionsblatt This Standard applies to sealing arrangements for moving roda, spin
2、dles or shafts; it does not apply to the sealing of pipe joints (socket type); departures from this Standard are permissible when carrying out repairs and overhauls. The number of packing rings, i.e. the depth of the packing chamber, is governed by the specific application involved and by the type o
3、f packing employed. Dimensions in mm o t I I I The diameters dq printed in bold type are standard dimensions derived from Series Ra 20. The packing widths s are preferred numbers from Series Ra 40. Their relationship to the rod diameters dl (with the exception of water pipe fittings) corresponds app
4、roximately to the expressions The diameters d2 enclosed by the stepped lines are preferred values. ) The outside diameters d2 I 8.5, 11, 13, 15, 18 and 20 apply only to water pipe fittings. The outside diam- ;) s =vd;l; s = 1.25m; 8 = 1.6% and 8 - 2%; see diagram page 2. eters d2 e 15, I8 and 20 sti
5、ll hare the bracketed diameters dq I 10.5, 12.5 and 14.5 allocated to them for the tima being. Only for hydraulic machinery and equipment. For diameters dl exceeding 210 mm the required packing widths are a = 20, 25 and 30 mm. Continued on page 2 Alleinverkauf der Normbltter durch Beuth-Vertrieb GmbH, Berlin 30 und Kln 12.82 DIN 3780 engl. Preisgr. 4 Vertr.-Nr. 0104 Page 2 DIN 3780 Relationship of packing widths to rod diameters rnm 30 25 20 16 12,s 10 :8 71 .,i M6 .: 5 o a4 t 235 2 15 r, 2!
