Position responsive valve control for hydraulic cylinder

Details Position responsive valve control for hydraulic cylinder Position responsive valve control for hydraulic cylinder

1985-10-09

1987-09-15

Look, Edward K.

Motors: expansible chamber type

Moving cylinder

Cylinder and piston have relative reciprocation on fixed axis

91304, F01B 1500

Patent

active

046931716

ABSTRACT:
A hydraulic well pump for operating a pump sucker rod string including a hydraulic cylinder assembly for raising and lowering the sucker rod string and a fluid counterbalancing system for offsetting the combined weight of the reciprocating service equipment, the fluid column above the pump plunger, and the sucker rod string. One counterbalancing embodiment includes an air supported piston on the movable cylinder exposed to an air chamber below the air piston functioning independently of the hydraulic and power and logic system of the pump. Another counterbalancing system embodiment uses a hydraulic fluid accumulator connected into the system fluid power and logic for supercharging the hydraulic power pumps during the lift stroke and providing opposing force during the downstroke. Also disclosed are: a stroke length multiplier apparatus including a multi-layered strip metal tension member; a pump stroke sensor and control for adjusting stroke end limits and lengths; and a fluid logic system for controlling stroke acceleration and deceleration.

REFERENCES:
patent: 2402848 (1946-06-01), Senn
patent: 2441925 (1948-05-01), Wege
patent: 2572748 (1951-10-01), Noll et al.
patent: 3620126 (1971-11-01), Fuhrimann

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