Device on a valve for shutting off and/or controlling a flow of liquid

An assembly for controlling the flow of water in a toilet tank cistern comprising:

• a water-tight two-piece valve box in said cistern having a fluid inlet communicating with a source of pressurized fluid, a fluid outlet communicating with the cistern, and a cylindrical chamber for supporting a valve body permitting fluid communication between said inlet and said outlet;
• a cylindrical valve body supported for axial rotation within said chamber by means of a dowel at one end thereof engaging a recess in said valve box and a journal at the other end thereof passing through a corresponding aperture in said valve box, said valve body being of sufficiently small diameter to permit fluid communication between said inlet and said outlet;
• a valve assembly comprising:
• a blind hole in said valve body positioned for alignment with said fluid outlet;
• a displaceable ball valve freely movable within said blind hole;
• said blind hole being of a depth so that it will at least hold the entire ball and the walls of said blind hole being such that the liquid under pressure is free to flow into a space in the blind hole behind the ball;
• and a valve seat adapted to receive said ball valve and form a closure therewith, said valve seat being positioned at the point of intersection of said cylindrical chamber and said fluid outlet;
• a float device within the cistern operatively associated with the journal of said cylindrical valve body so that the raising or lowering of said float device rotates said valve body about its axis within said chamber between a first position wherein said blind hole overlies said fluid outlet and a plurality of other positions wherein said bore is displaced from said first position;
• whereby when the valve body is displaced from its first position fluid enters the cylindrical chamber through the inlet, passes between the walls of the chamber and the cylindrical valve body, and exits from the chamber through the outlet, and when the valve body returns to its first position the low pressure in the outlet compared to the higher pressure in the chamber causes the ball valve to positively sit on the valve seat and close the outlet.