Constant flow valve

A dispensing valve including means for automatically regulating selected rates of fluid flow in syrup and water flow channels under varying fluid source pressures comprising:

• (a) means to initiate and terminate flow from said sources through said valve,
• (b) a valve body having two cylindrical bores therein each defining a chamber, said body having inlet ports for each bore and a single outlet port through the side of each bore;
• (c) a piston disposed within each said cylindrical chamber each comprising a piston head portion and a skirt portion defining a hollow interior and each sized to permit fluid flow around its periphery to its chamber outlet, each said piston being axially movable within its cylindrical chamber in response to the pressure of the fluid introduced into its chamber to regulate the fluid flow through the associated outlet port by the skirt portion acting as a shutter to increase or decrease the available flow area through the associated outlet port in inverse proportion to changes in the fluid pressure at the inlet port;
• (d) two springs, one disposed on the downstream side of each said piston that extends into the hollow interior of said piston and engages the underside of the piston head portion, said spring yieldably opposing axial downstream movement of said piston;
• and
• (e) adjustment means carried in said valve body for setting the opposing force of said springs and the axial positioning of said pistons within the cylindrical chambers in said valve body.