Abstract: A pump comprising a body having at least one chamber and preferably two axially spaced and aligned pumping chambers, each such pumping chamber communicating at opposite ends respectively with a pump inlet and a pump outlet and containing an actuator reciprocable longitudinally of the pumping chamber by drive means, the actuator having a rigid main central portion and a peripherally extending elastic sealing ring in non-sliding fluid-tight engagement with a lateral wall of the pumping chamber and having mounted thereon actuator valve means controlling the flow of fluid from the inlet to the outlet of the pump, the pumping chambers communicating at their outlet ends with manifold passageways in the body of the pump which in turn communicate with respective passageways in an outlet duct situated on opposite sides of a longitudinally extending web therein terminating at a position spaced from the downstream end of the outlet duct to provide for cyclic flow of the pump fluid out of one pumping chamber and into the

Abstract: A downhole, hydraulically actuated pump assembly of the free or fixed type which includes a control valve positioned above the engine, and a plurality of pistons connected together by a hollow connecting rod. The pistons are arranged to divide a production cylinder from an engine cylinder, so that the connecting rod is always placed in compression, thereby avoiding rod breakage. The hollow connecting rod is employed to supply power fluid to the lower engine, and the rod ends are arranged to have fluid pressure exerted thereagainst to improve the operation of the pump assembly.The production pump divides the engine into an upper and lower engine assembly so that the upper engine strokes the pump in a downward direction, while the lower engine strokes the pump in an upward direction.

Abstract: A headlamp cleaning assembly of the type for cleaning vehicle headlamps and including first and second nozzles for jetting an air/liquid mixture against a headlight surface. A regulator means is included for mixing air and liquid and for sequentially supplying the resultant air/liquid mixture to the first nozzle for a first period of time and then to the second nozzle for a second period of time to complete one cycle. The regulator includes a piston slidably disposed in a cavity to define an air/liquid mixing chamber which is opposed by a liquid charging chamber. The piston also defines an air actuation chamber which, when supplied air, moves the piston from a start position to a charged position to charge by filling the charging chamber with liquid. A stem is connected to and extends upwardly from the piston and is slidably disposed in a stem chamber for actuating an air valve which, in turn, allows pressurized air to flow into the stem chamber.