Fluid handling – Processes – With control of flow by a condition or characteristic of a...
Patent
1977-08-25
1979-05-01
Nilson, Robert G.
Fluid handling
Processes
With control of flow by a condition or characteristic of a...
137389, 137606, 13762411, F16K 1900
Patent
active
041518543
ABSTRACT:
A process control system especially adapted for mixing and supplying fountain solution to printing press apparatus obviates the need for mechanical float metering devices and scale mechanisms heretofore used for mixing of liquid solution ingredients in prescribed ratios, by providing an electrical circuit control system for measuring the quantity of liquid ingredients to be mixed and for controlling the sequence in which the ingredients are transferred between a plurality of mixing and holding tanks. A selectively variable time base is correlated with the quantity of a primary liquid ingredient introduced to a mixing tank and an electrical sensing device is operative to detect the presence of a quantity of fountain solution within the tank corresponding to a batch thereof. A proportionate relationship is established between the time correlated quantity of the primary ingredient, the quantity of the fountain solution detected by the sensing device, and the quantity of a secondary liquid ingredient introduced to the mixing tank, whereby to precisely preestablish the ratio of the primary ingredient to the secondary ingredient present in each batch of the solution transferred from the mixing tank to a holding reservoir. A series of valves interconnecting the mixing and holding tanks are selectively actuated by the control system to achieve continuous, automatic mixing, and transfer to the holding reservoir of successive batches of the fountain solution, in order to constantly replenish the holding reservoir, as fountain solution supplied to the printing presses from the reservoir is gradually depleted.
REFERENCES:
patent: 3605783 (1971-09-01), Pecker
patent: 3823728 (1974-07-01), Burris
patent: 3870076 (1975-03-01), Graznak
Inland Newspaper Machinery Corporation
Nilson Robert G.
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