Patent ID: 6148839
Filing Date: 2000-11-21
Classification: G05D,Y10T

Abstract:
An apparatus for injecting a liquid chemical product into a main line water supply, comprising:a. a supply of liquid chemical product;b. a product injection pump having an inlet line connected to said supply of chemical product, and a product outlet line, said injection pump producing a pulse free outlet flow of the chemical product;c. a pressure regulating bypass valve interposed in said product outlet line, having an excess pressure bypass line interconnected to said inlet line;d. a continuously variable, electrically actuated control valve, interposed in said product outlet line downstream from said bypass valve;e. a product flow meter interposed in said product outlet line downstream from said control valve, said product outlet line thereafter being fed into the main line water supply at an injection point;f. a main line flow meter interposed in the main line water supply; and,g. a computerized controller, having an output connected to said control valve, a first input connected to said main line flow meter, and a second input connected to said product flow meter, said controller varying said control valve in response to an output of said main line flow meter and an output of said product flow meter.