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US 5,252,037 AGranted
Piston valved vertical pump for particulate materials
AssigneeAseptic Technology Engineering Co.
InventorV. R. Carlson
Life of this patent
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AssigneeAseptic Technology Engineering Co.
InventorV. R. Carlson
Estimating the term…
A piston pump for conveying fragile particulate food products without damaging the product. The pump includes a filler and a discharge conduit containing piston valves actuated by hydraulic cylinders. The pumping chamber in which the product is compressed is equipped with a linear displacement transducer/magnet sensor which senses not only the position, but the speed of the piston. In response to the sensor, a proportioning valve releases hydraulic fluid at increasing pressure to a desired maximum, to the hydraulic cylinder actuating the piston in the pumping chamber of a second pump operating in tandem with the first pump. The product is expelled alternatively from the two pumps at the maximum desired pressure appropriate for the character of the product. The pump also includes means for flushing the pump without dismantling.
A high capacity piston pump for conveying slurries without damaging particulate material therein comprising:
An assembly of two piston pumps operating in tandem to supply particulate food product in precise metered quantities to processing equipment operating at a maximum pressure downstream of the pumps, each pump having a pumping chamber, a piston in said pumping chamber, a filler conduit and a discharge conduit, a piston valve in each said filler and said discharge conduits, hydraulic cylinders for actuating said pumping chamber piston and said piston valves, means on said pumping chamber for sensing continuously the position and speed of said pumping chamber piston, said sensing means comprising a linear displacement transducer and cooperating magnet, solenoid valve means responsive to said sensing means for actuating said hydraulic cylinders in a predetermined time sequence and proportioning valve means for supplying hydraulic fluid to the hydraulic cylinder actuating said pumping chamber piston at an accelerating rate to increase the pressure on said product up to said maximum pressure whereby product being expelled from one pump at below a predetermined pressure at the end of the stroke of the pumping chamber piston, is complemented by product expelled from the other pump at the beginning of the stroke of the pumping chamber piston to discharge product at a constant rate and pressure.
Dependencies are inferred from the claim text.