Abstract: A pump drive head for a progressing cavity pump comprises a top mounted stuffing box rotatably disposed around a compliantly mounted standpipe with a self or manually adjusting pressurization system for said stuffing box, To prevent rotary and vertical motion of the polish rod while servicing the stuffing box, a polished rod lock-out clamp is provided with the pump drive head integral with or adjacent to a blow-out-preventer which can be integrated with the pump drive head to save space and cost. A centrifugal backspin braking system located on the input shaft and actuated only In the backspin direction and a gear drive between the input shaft and output shaft are provided.

Abstract: A slidable load lift apparatus is selectively completely retractable into the bed of a standard pickup truck. The load lift apparatus includes a base frame member attached to the pickup truck bed, the base frame member supporting a substantially planar roller platform member slidably engaged with the base frame member. The base frame member includes a pair of elongate rail members extending in parallel along a first longitudinal axis and adapted to engage a set of roller wheels provided on the bottom of the roller platform member. A substantially planar lift platform member is operatively connected to the roller platform member through a set of parallelogram linkages which permit the lift platform to be moved between a raised position coplanar with the roller platform member and a lowered position out of the plane of the roller member for convenient loading of the lift platform at ground level.

Abstract: An improved submersible pump valve assembly, actuated by the reciprocating movement of a sucker rod extended from surface equipment to a downhole traveling valve located in a tubing string, the valve assembly comprising a rotatable fluid port assembly supported in a barrel assembly which has a beveled seating surface with fluid ports therethrough. A reciprocatable actuator member having a screw rod portion coacts with a gear bore of the fluid port assembly to open the fluid ports thereof during the downstroke movement of the actuator member and to close the fluid ports during the upstroke movement. Also, the actuator member opens and closes the fluid ports of the barrel assembly alternately during its downstroke and upstroke positions, respectively. A middle rod connector, which connects the actuator to the sucker rod, has multiple fluid jetting ports which serve to agitate particulates in the reservoir liquids being pumped.