Expansible chamber devices – Displacement control of plural cylinders arranged in... – By adjusting or limiting motion of relatively movable power...
Patent
1984-03-26
1986-11-11
Freeh, William L.
Expansible chamber devices
Displacement control of plural cylinders arranged in...
By adjusting or limiting motion of relatively movable power...
92168, 92137, 417458, F15B 1524, F01B 900, F04B 2100
Patent
active
046215670
ABSTRACT:
A beam pump for use as a chemical injection pump in conjunction with a walking beam and having a pump shaft which is slidable within a pump body. The shaft is pivotally connected to a lever bar which is drivingly connected to the walking beam. A pivot support bar is semi-rigidly attached to the beam pump body and is pivotally attached to the lever bar. The semi-rigid attachment enables the pivot support bar to move slightly in order to maintain the vertical alignment of the pump shaft with respect to the pump body. Further guidance and sealing is provided by an O-ring seal which is made up of a solid lubricant material, a guide plug and a spring loaded seal ring and back up seal. The pump shaft and pump body surrounding said shaft are coated with a solid lubricant material. Further lubrication of the pump shaft is accomplished by lubrication passages within the pump body. A double acting check valve which has a first ball valve upstream of a metal seat and a second ball valve upstream of an O-ring seat is used to prevent leakage back to the chemical source. An adjustable stroke limiter is provided to limit the amount of chemical injected with each stroke of the beam pump shaft. The pump shaft is biased towards its fully extended intake stroke position by a torsion spring.
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