Pumps – Processes
Patent
1990-02-26
1991-12-10
Hepperle, Stephen M.
Pumps
Processes
92 131, F04B 1300
Patent
active
050713205
ABSTRACT:
A control system and method for chemical injectors includes a controller which outputs multiple feed set point signals and associated driver signals, each set point signal defining a desired injection capacity for a chemical injector and the associated driver designation signal designating the injector to receive the set point signal. A driver assembly is associated with each injector. The driver assembly receives a capacity signal from the injector which defines the volumetric injection capacity of the injector, compares the capacity signal to the feed set point signal, and outputs a drive signal to adjust the volumetric injection capacity of the injector. An adjustment assembly is provided for receiving the drive signal and positioning a stop to limit the reciprocal motion of the piston of the injector, thereby adjusting the volumetric injection capacity of the injector. The injectors inject into a common carrier fluid, such as irrigation water, and the carrier fluid, through a carrier fluid flow operated valve, is also used to reciprocate the injector pistons. A disabling assembly is provided to disable the driver assemblies when the pistons of the injectors are forced against the stops.
REFERENCES:
patent: 2090069 (1937-08-01), Richardson et al.
patent: 2576747 (1951-11-01), Bryant
patent: 2675758 (1954-04-01), Hughes
patent: 3080852 (1963-03-01), Geyer
patent: 4141383 (1979-02-01), Geimer
patent: 4167896 (1979-09-01), Clements
patent: 4368754 (1983-01-01), Roberts
patent: 4420393 (1983-12-01), Smith
Bahm, Inc.
Hepperle Stephen M.
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