Apparatus for administering parenteral liquid in sequential units provided with a ball valve float

In a parenteral liquid administering device which comprises tubular means for connecting said device to a source of said liquid, and an enlarged, liquid-holding chamber positioned in flow communication with said tubular means, said chamber including a bottom flow aperture, and a valve controlling flow through said aperture, the improvement comprising, in combination:

• said valve including:
• a buoyant float ball, a valve seat positioned about said bottom flow aperture to receive said ball in air-tight sealing relation in the absence of sufficient liquid to float said ball, and apertured retention means surrounding said ball and proportioned to permit it to float in spaced relation from said valve seat in the presence of liquid passing through said apertured retention means, said apertured retention means defining a generally cylindrical chamber, said chamber defining an annular step positioned upstream from said valve seat and extending in generally normal relation to the axis of said enlarged liquid holding chamber, said annular step being positioned about said float ball when positioned on the valve seat whereby turbulent flow of liquid is created upon filling said retention means with the liquid.