Abstract: An arm structure intended for controlling the impulse valve (5) of the oscillating cylinder which performs a back and forth movement whereupon the oscillating cylinder comprises a cylinder body (14), a cylinder chamber (1) formed into the mentioned body, a piston (2) which can be moved in the cylinder chamber with the help of a pressure media, feeding channels (15, 16, 17) of the pressure media to the cylinder chamber (1) and control devices in order to direct the pressure media to the cylinder chamber to various sides of the piston and away from the cylinder chamber in order to achieve a back and forth movement for the piston and whereupon the impulse valves (5) belong to the control devices the operation of which at least one arm (10); (12), which explores mechanically the position of the piston arm (7) the movement of which arm is adjusted to open the pressure relieving channel of the impulse valve (5).

Abstract: A valve assembly for controlling the flow of pressurized fluid supplied to an actuating cylinder having a piston driven by the pressurized fluid along a stroke path therewithin, the pressurized fluid being applied to alternative driving sides of the piston. The valve assembly comprises a first and a second valve pistons, which cooperate to block the supply of pressurized fluid to the current driving side of the piston when the piston reaches the end of its stroke path, thereby limiting the pressure of the pressurized fluid supplied to the driving side to a level reduced compared to a pressure level applied to drive said piston. If a leak occurs within the actuating cylinder at the end of the stroke path of the piston, it will be at the reduced pressurized fluid pressure.

Abstract: Fluid pump assembly driven by a reciprocating piston, having an improved coupling between a driving shaft and a driven shaft and a fast-shifting switching mechanism for changing the direction of movement to the piston.

Abstract: An air operated double diaphragm pump is provided with an air valve assembly which allows the valve cup to move in a rectangular pattern.

Abstract: A cylinder including a housing disposed between a head and a board, a body disposed in the housing and closely contacted with the head, a piston slidably disposed in the housing, a piston rod coupled to the piston, a valve including five rings being disposed in the head, a valve including five annular grooves being disposed in the body, an inlet being formed in the head for continuously supplying hydraulic oil into the cylinder, the piston can be urged to move in a reciprocating action without changing the supplying direction of the hydraulic oil.

Abstract: A hydraulic power and control system for operating a reciprocating hydraulic mechanism including pump means connected to the hydraulic mechanism, a continuous torque hydraulic motor, a direction control driven by the motor to sequentially direct hydraulic power fluid to separate inlets of the mechanism, an escapement for restraining the motor at 180.degree. intervals of rotation for sequentially holding the direction control at two separate positions, one for supplying one inlet and the other for supplying the other inlet of the mechanism, and hydraulic limit valves for controlling the escapement when a reciprocating member of the mechanism reaches the end of each stroke. One embodiment has two constant volume hydraulic pumps connected with the hydraulic mechanism through a reversing valve assembly operated by a scotch yoke connected with the escapement.

Abstract: A hydraulic well pump for operating a pump sucker rod string including a hydraulic cylinder assembly for raising and lowering the sucker rod string and a fluid counterbalancing system for offsetting the combined weight of the reciprocating service equipment, the fluid column above the pump plunger, and the sucker rod string. One counterbalancing embodiment includes an air supported piston on the movable cylinder exposed to an air chamber below the air piston functioning independently of the hydraulic and power and logic system of the pump. Another counterbalancing system embodiment uses a hydraulic fluid accumulator connected into the system fluid power and logic for supercharging the hydraulic power pumps during the lift stroke and providing opposing force during the downstroke.

Abstract: A hydraulic pumping unit is provided that is especially adapted for use for pumping oil from a well, and that provides for independent upstroke and downstroke speed control of the well sucker rod. The pumping unit includes a load sensing, pressure and flow compensated pump that is destroked under no load conditions, a pumping cylinder including a polished rod coupled to the sucker rod, and a unique hydraulic valving assembly that couples the hydraulic fluid pump with the pumping cylinder. The hydraulic valving assembly includes a cylinder control module for independent control of the rates at which the polished rod is raised and lowered, and a signal control module for indicating the upper and lower limits of polished rod travel within the pumping cylinder. The cylinder control module provides for soft turnaround of the polished rod, thereby guarding against stretching of the sucker rod and subsequent degradation of the unit's pumping capacity.

Abstract: The pump or pumps for supplying fluid to the two ends of a double-acting cylinder include a direction control, such as a direction control valve, shiftable between extend and retract conditions. A drive mechanism for the direction control includes a rotary hydraulic motor and a driven rotary drive mechanism for shifting the direction control. Hydraulic fluid is supplied to the drive motor through parallel connected start and stop valves. The start valve is opened in response to the movements of the hydraulic cylinder toward a stroke limit. The stop valve is operated in response to the shifting of the direction control, so that the motor is operated intermittently to reverse the direction control when the cylinder reaches the limit of an extend or retract stroke. The stop valve is controlled by the drive mechanism in timed relation with the shifting of the direction control. The start valve may be closed by that drive mechanism in timed relation with the opening of the stop valve.

Abstract: A fluid-operated reciprocating pump having a central housing, a pair of chamber housings attached to opposite sides of the central housing, and a pumping diaphragm in each chamber housing that separates an inner pressure chamber from an outer pressure chamber. Each outer pressure chamber is connected to an inlet manifold and a discharge manifold, and one-way check valves control the flow of the material being pumped through the chamber. The pumping diaphragms are connected together by a connecting rod that extends through the central housing. The central housing defines inlet and outlet ports for operating fluid, a reversing valve chamber, a pilot valve chamber, and passages connecting the reversing valve chamber to the pilot valve chamber, the inlet port and the inner pressure chambers.

Abstract: A fluid-operated reciprocating pump having a central housing, a pair of chamber housings attached to opposite sides of the central housing, and a pumping diaphragm in each chamber housing that separates an inner pressure chamber from an outer pressure chamber. Each outer pressure chamber is connected to an inlet manifold and a discharge manifold, and one-way check valves control the flow of the material being pumped through the chamber. The pumping diaphragms are connected together by a connecting rod that extends through the central housing. The central housing is formed by a pair of identical, generally tubular, molded sections secured to one another in reverse relationship to define inlet and outlet ports for operating fluid, a reversing valve chamber, a pilot valve chamber, and passages connecting the reversing valve chamber to the pilot valve chamber, the inlet port and the inner pressure chambers.

Abstract: A reciprocating fluid pump has a dual piston element and dual diaphragms in fluid communication therewith. Full movement of the dual piston element in either direction of movement causes movement of a pilot valve which simultaneously vents a first working chamber located in the direction of movement of the dual piston element and occasions reciprocating movement of the dual diaphragms, thereby directing a pump power medium to a second working chamber to cause movement of the dual piston element in the opposite direction.

Abstract: Automatically Self-Reciprocating sequencing valve for use with pneumatic power cylinders/actuators in systems operated at frequencies of a few cycles to a few thousand cycles per minute comprises a valve housing with a central bore adaptable to receive a shuttle member that makes or breaks fluid communication between a fluid supply source and a receiver such as a power cylinder or an actuator of a positive displacement pump in response to fluid pressures acting over surfaces such shuttle member entails as controlled by appropriate slave valve housed alongside therein including fluid supply and exhaust ports entering and leaving said valve housing, and together with said slave valve allowing an automatic reciprocating-valve-operation for as long as the pressurized fluid is supplied thereto to result in self-reciprocating operator responsive to not only system pressures for cycle regulation but also to an externally provided biasing flow regulator for an easy control of cycle frequencies within the desired prac