Draw-off tube

Claim 1

A draw-off tube having on its free end a frontally closed tubular extension, to which there is detachably connected a head with an external radial flange and a cylindrical externally screwthreaded casing extending axially and downwardly from said flange and surrounding said tubular extension coaxially, which external screwthread, after insertion of the draw-off tube in a cask of beer or the like, admits of being screwed into the internal screwthread of the bung hole of the cask, a movable ring valve being provided in the space between the inner wall of the cylindrical casing and the outer wall of the tubular extension, which ring valve is substantially flush with the radial flange and is caused to abut against seats formed by the ends of said inner and outer walls by a spring, in particular a helical compression spring, said ring valve having its outer circumference adapted to simultaneously free or close a compressed gas passage and having its inner circumference adapted to simultaneously free or close a beer passage formed by a row of radial openings provided adjacent the closed end of the tubular extension, which cylindrical casing has a downward extension to a support flange for the compression spring, which flange is provided on the tubular extension and is detachably connected to the downward extension of the casing, characterized in that said downward extension comprises a number of axially extending arms which in the untensioned condition define an outwardly flaring slightly conical outer surface and a cylindrical inner surface in relation to the screwthread core, the free ends of each of said arms being provided with an opening each of which receives one of a corresponding number of radially disposed arms extending from the support flange when the cylindrical casing is slid over the tubular extension.