The Water Engine

Water flow drives the main piston. Each 1/2 quart (475 ml) of water flow moves the piston. At the end of the stroke, the inversion mechanism clicks, and the piston changes direction. Each quart (950 ml) of water flow results in two clicks or one complete cycle.

The water-driven main piston is connected to the dosage piston and cylinder. The dosage piston draws chemical from an open container and injects the predetermined amount of chemical into the quart (950 ml) of water that powers the main piston.

Step 1: The up stroke:  Water enters the unit with the lower valves closed, forcing the piston up and squeezing the water out of the upper chamber into the mix chamber, then through the outlet.  The piston hits the top of the cylinder changing the valve position.

Step 2: The down stroke:  The lower valves open, the upper valves close, and water enters the upper chamber forcing the piston down and squeezing water out of the mix chamber through the outlet.  The piston hits the bottom of the cylinder and the cycle starts anew.