Abstract: Methods and apparatus for converting energy from a stream of compressed gas into mechanical work as systems incorporating such methods and apparatus.

Abstract: A downhole bladder pump for pumping ligher-than-water liquids. The pump includes an outer tube closed at its bottom and top, but having slots adjacent its upper end to admit the liquid to be pumped. Positioned concentrically within the outer tube is a cylindrical bladder chamber. A cylindrical bladder is mounted within the bladder chamber and registers with the internal surface of such chamber. A cyclically-operated pneumatic control system periodically delivers pressurized air to the space between the bladder and the bladder chamber to collapse the bladder and pump liquid which has flowed into the bladder. At other times during the cycle, the control system draws the bladder outwardly against the internal surface of the bladder housing by the application of vacuum. The liquid to be pumped is then forced into the bladder through a check valve subassembly positioned in the lower end of the bladder housing.

Abstract: An apparatus for controlling the flow of a pressure fluid in a motor includes an arm which cooperates with a locking device to regulate the flow of the pressure fluid through a shut-off member or valve. The arm is connected to a lever which is pivotable about the same axis as the arm. Through resilient means, the arm and the lever are prestressed so that upon movement of the lever into a predetermined position, the arm which is locked in its end positions by a respective lock pawl is released and impelled from one end position into the other. During the movement of the arm, the shut-off valve is actuated so as to regulate the pressure fluid.