Subsurface pumping unit incorporating heavy duty reversing valve

Details Subsurface pumping unit incorporating heavy duty reversing valve Subsurface pumping unit incorporating heavy duty reversing valve

1976-06-03

1978-05-02

Croyle, Carlton R.

Pumps

Processes

417404, 91228, 91229, 91342, F04B 1700, F01L 2104

Patent

active

040872068

ABSTRACT:
The invention relates to apparatus for and the method of reversing the operation of a power piston in a power cylinder automatically to pump oil, corrosive or wax bearing fluids. The flow of high pressure fluid driving the piston in one direction may be reversed to drive the piston in the opposite direction at the end of the respective strokes by establishing a collapsible chamber for the high pressure fluid within the piston. This chamber is at least partially collapsed toward the end of each stroke by the stem of an auxiliary reversing piston striking a stop slightly before the end of the stroke to partially collapse said chamber and establish a further chamber on the opposite side of the reversing piston. At the conclusion of each stroke, all valving is closed and the high pressure within the collapsible chamber now exerts force against the reversing piston, but since the stem of the reversing piston is against the stop, the force is oppositely directed to reverse the direction of the power piston by collapsing the second-mentioned chamber, while exhausting the same to crack the valving ports and enable the high pressure to drive the piston in the opposite direction. The provision of a single large passage for exhausting the second chamber is of particular significance in reliable operation.

REFERENCES:
patent: 1441017 (1923-01-01), Mattson et al.
patent: 2146213 (1939-02-01), Horton
patent: 2727467 (1955-12-01), Russell
patent: 3236441 (1966-02-01), Russell

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