Abstract: An automatic chemical dispensing system is provided wherein a preselected quantity of liquid chemical drawn from one of several storage vessels is dispensed to one of several different receptacles using a single operating pump. The system includes a single remote controllable operating pump, remote controllable inlet and discharge valves, a single flow indicator and a liquid flush system. The system is controlled by a computerized controller. Piping linking the storage vessels, the pump and the receiving vessels is configured so that the operating pump draws a requested chemical from the appropriate storage vessel and pumps that chemical into a discharge header located between the pump and the receiving vessel. As the operating pump pumps the chemical into the discharge header, flow through the header is noted on the single flow indicator.

Abstract: A peristaltic pump has facing half shells defining a pumping cavity and circular tube access grooves entering the cavity. Rotor apparatus includes a cylinder having concave, semi-spherical end surfaces rotatably supporting roller balls therein. The pumping cavity has a tube supporting substantially semi-annular, semicircular seat. Spring loaded roller bearings in rotor axial bores communicate with the roller balls adjacent the concave surfaces. The roller bearings engage the roller balls urging a central crescent shaped occlusion of the tubing.In operation, tubing is inserted in the access openings. The impeller rotation and frictional forces transmitted by the roller balls forces the tubing about the semicircular seat and out the opposing access groove. The roller balls impinge the tubing normal to a nominal tube axis to cause an occlusion deforming the tubing to a crescent configuration.