Fluid valve

A throttle valve assembly for controlling the flow of an air/fuel mixture through a carburetor of a motor vehicle, the assembly including an air/fuel flow path having a core positioned centrally therein, the flow path being defined by a tube valve having a flexible wall separating the flow path from a working fluid chamber surrounding the flexible wall, whereby changes in the pressure within the chamber cause deformation of the flexible wall resulting in changes in the tube cross-section between a wide open throttle valve position and a valve closed position, characterized in that the flexible wall collapses to a valve closed position in a free state when the pressures on opposite sides of the wall are equal, and means in the valve closed position providing a minimum fluid flow through the flow path from one side of the valve to the other side, and tube valve closure control means for controlling the movement of the flexible wall in a tube valve closing direction, the control means normally limiting the wall movement at a predetermined position before the wall seals against the valve core to maintain a minimum fluid flow position, for minimum flow at all times from one side of the tube valve to the other, between the core and the flexible wall.

A throttle valve assembly for controlling the flow of an air/fuel mixture through a carburetor of a motor vehicle, the assembly including an air/fuel flow path having a core positioned centrally therein, the flow path being defined by a tube valve having a flexible wall separating the flow path from a working fluid chamber surrounding the flexible wall, whereby changes in the pressure within the chamber cause deformation of the flexible wall resulting in changes in the tube cross-section between a wide open throttle valve position and a valve closed position, characterized in that the flexible wall collapses to a valve closed position in a free state when the pressures on opposite sides of the wall are equal, and means in the valve closed position providing a minimum fluid flow through the flow path from one side of the valve to the other side, the tube defining the fluid flow path having a rigid tubular inlet pipe and a rigid tubular outlet pipe and the flexible wall comprising a flexible elastic tube extending between the inlet and outlet pipes, the tube having a substantially constant cross-section in its free state smaller in diameter than the diameters of the inlet and outlet pipes to provide an interference fit therebetween upon assembly.