Pumps – With signal – indicator – or inspection means
Patent
1989-10-23
1991-11-19
Nilson, Robert G.
Pumps
With signal, indicator, or inspection means
417521, F04B 102
Patent
active
050661990
ABSTRACT:
A method for providing a continuous injection of a constant amount of a desired treatment chemical into a flowing stream is described. This method insures that the concentration of the desired treatment chemical is maintained at a relatively uniform concentration throughout the flowing stream. A constant flow pumping apparatus for providing the continuous injection of the treatment chemical is also described. The pumping apparatus includes multiple positive displacement pumps which are driven by a cam such that the rates of displacement of the displaceable members of the positive displacement pumps is a constant positive value. This insures that the pumping apparatus provides a constant flow of the treatment chemical being injected into a flowing stream. Providing a uniform concentration of a treatment chemical in a flowing stream maximizes the benefit of the treatment chemical. Conventional positive displacement pumps for injecting treatment chemicals provide intermittent injection of the treatment chemical such that sections of the flowing process stream have no concentration of the treatment chemical. This reduces the benefit of the treatment chemical and may prevent it from providing any benefit at all.
REFERENCES:
patent: 2697403 (1954-12-01), Benedek
patent: 3323461 (1967-06-01), Bennett
patent: 3816029 (1974-06-01), Bowen
patent: 4192223 (1980-03-01), Lombard
patent: 4453898 (1984-06-01), Leka
Bulletin 200-5, 200 Series Crane Chem/Meter Hydraulically Actuated Diaphragm Metering Pump, undated.
Crow Stanley G.
Reese D. Dwaine
Sawyer Roy D.
Nalco Chemical Company
Nilson Robert G.
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