Abstract: A reciprocating-type piston compressor that can operate at very low speed (<300 rpm) with the ability to pump liquids. It can be configured with one or more double-acting cylinders. A variable speed drive can be used to adjust the operating speed of the compressor to control system torque requirements throughout the compression cycle.

Abstract: A right angle drive adapter for use with an oil well vertical drive head having a drive head housing and an input shaft rotatably mounted in and extending axially outwardly of the drive head housing. The adapter comprises an adapter housing removably securable to the drive head housing in axial alignment therewith, an input shaft mounted in the adapter housing for rotation therein and for removable attachment to a rotary source of power, an output shaft mounted in the adapter housing for rotation therein at substantially a right angle to the input shaft, the output shaft having a socket for telescopically receiving and drivingly connecting to the drive head input shaft; and a gearset mounted in the housing for drivingly connecting the input and output shafts. The adapter allows the installation of a vertical drive head and a gas engine to be used for driving the drive head before electrical power is available.

Abstract: A backspin retarder for a shaft comprises a brake mechanism including a stationary brake member and opposed brake members rotatable with the shaft and movable between braking position in which the movable brake members engage the stationary brake member and a non-braking position in which the movable brake members are removed from the stationary brake member and a brake control mechanism responsive to the direction of rotation of the shaft for disabling the brake mechanism when the shaft rotates in a forward direction and for enabling the brake mechanism when the shaft rotates in a reverse direction.