DIN 7633 is for Compression fittings with spherical liners - Adapters for brazing
DIN 7633 brazing adaptor drawing chart as follow
DIN 7633 is included in DIN Handbook 348. Applies to brazing nipples (hereinafter briefly referred to as nipples), which are used for pipe joint assemblies with spherical liner as specified in DIN 3863.
DIN 7633 weld brazing adapters dimension chart as follow
DIN 7601 : 1998 COMPRESSION COUPLINGS WITH BALL-TYPE NIPPLES - COMPLETE UNIONS AND SURVEY
DIN 3850 : 1998 COMPRESSION FITTINGS - SUMMARY
DIN HDBK 348 : 3ED 2015