Pumps – One fluid pumped by contact or entrainment with another – Liquid pumped by supplying or exhausting gaseous motive...
Patent
1993-08-18
1995-09-19
Bertsch, Richard A.
Pumps
One fluid pumped by contact or entrainment with another
Liquid pumped by supplying or exhausting gaseous motive...
417134, 417138, 417143, 417145, F04F 106
Patent
active
054511445
ABSTRACT:
An air-operated pump includes a pair of poppet valves affixed to a vertical valve shaft and arranged so that the upper valve is closed when the lower valve is open, and vice versa. When a connected displacer is immersed in tank fluid, its buoyancy in combination with a bias spring translates the valve shaft to operate the poppet valves. An upper poppet valve chamber is connected [1 ] via a restrictance to an auxiliary air supply, and also [2] to an air operator that triggers a three-way pneumatic valve, an inlet port of which controls a main air supply while a second port is vented to atmosphere. A third port transmits an air supply to the tank through the intermediation of a quick exhaust valve, which rapidly vents the tank at the end of each pump cycle and also serves to isolate the three-way valve from any tank-fluid contamination. Before fluid rises to the level at which pumping begins, the upper popper stays closed and high-pressure air thus trapped in its chamber keeps the air operator of the three-way valve actuated, blocking the main air supply. When fluid reaches the critical level, the buoyancy-aided displacer and shaft-mounted popper valves are pulled up by the bias spring, and the upper poppet vents its chamber, lowering the pressure to the air operator, which triggers the three-way valve and the quick exhaust valve into closing the tank vent to atmosphere and transmitting the main air supply into the tank to initiate pumping by ejection. The lowering fluid level causes the displacer and shaft-mounted valves to drop, whereby pressure in the upper poppet chamber rises to reactuate the air operator, switching the three-way valve back to its first position, so that the air supply is cut off from the tank, and the quick exhaust valve rapidly vents the tank to atmosphere.
REFERENCES:
patent: 3077163 (1963-02-01), Eyman
patent: 3972650 (1976-08-01), Brennan
patent: 4021147 (1977-05-01), Brekke
patent: 4321017 (1982-03-01), Gottliebson
patent: 5074758 (1991-12-01), McIntyre
patent: 5092743 (1992-03-01), Dietrich
Bertsch Richard A.
Cohen Howard
McAndrews, Jr. Roland G.
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