Abstract: A lubrication system includes a lubrication tank, a gearbox driven pump, an electrically driven pump located in parallel with the gearbox driven pump, and a first control valve for selectively connecting the electrically driven pump or the gearbox driven pump with the lubrication tank.

Abstract: Methods and apparatus to determine operating parameters of a pumping unit for use with wells are disclosed. An example apparatus includes a housing and a processor positioned in the housing. The processor is to determine a rate at which to operate a motor of a pumping unit to enable a load imparted on a polished rod of the pumping unit to be within a threshold of a reference load or to enable a speed of the polished rod to be within a threshold of a reference speed.

Abstract: A rotational speed control apparatus for an engine that drives an air conditioning compressor includes an electronic control unit. The electronic control unit corrects a calculated value of a load torque of a compressor in accordance with a deviation between a rotational speed of the engine and a target rotational speed, as a changeover transition period control, in a changeover transition period. The electronic control unit also sets an execution period of the changeover transition period control such that the execution period in a changeover transition period from the stopped state to the driven state of the compressor is longer than an execution period of the changeover transition period control in a changeover transition period from the driven state to the stopped state of the compressor.

Abstract: A fluid end (16) for a high pressure pump has suction and discharge covers (170) which are generally cylindrical-shaped and have annular-shaped recesses (190) which are formed to extend into the inner ends (174) of the covers (170). The recesses (190) provide expansion grooves which extend from the inner ends (174) to define flex regions (192) which are concentric with an outward peripheries (180) of the covers (170). The recesses (190) extend to positions intermediately disposed between seal grooves (166) and outer ends (176) of the covers (170). Stress relief portions (196) of the recesses (190) are located between the seal grooves (166) and the outer ends (176). High fluid pressures in the fluid end (16) expands the flex regions (192) of the covers (170) to press an adjacent portion of the outward peripheries (180) of the covers (170) into port walls to provide metal to metal seals.

Abstract: A valve for the control of a fluid flow may be provided, the valve including a connection block having a cylinder-symmetrical recess, where at least one first and a second entry channel as well as a first and a second exit channel run out in the peripheral surface of the recess. A control pin, which is fitted into the recess, is rotatable about a rotation axis, having at least two through-channels and connecting different ones of the entry and exit channels of the connection block to one another depending on its angular position. A first through-channel in the pin, with respect to the rotation axis, may exclusively connect channels running out at a first axial height, to one another, and a second through-channel exclusively connecting channels running out at a second axial height, to one another.

Abstract: A valve assembly for a diaphragm pump reduces leakage while providing good flow-through by including shaping of the seat and/or the valve that increases the elastic tension between the valve and seat in outer regions of the valve assembly, thereby providing a more optimal tension over the entire valve. In embodiments, outer regions of the seat are more steeply sloped upward than inner regions while the valve is substantially uniform in slope. In other embodiments, valve outer regions are less steeply sloped upward, or more steeply sloped downward, than its inner regions, and the seat is substantially uniform in slope. A vertical cross section of the seat and/or valve can include continuous curvature and/or discrete changes in linear slope. In some embodiments, two linear slopes are included in the vertical cross section of the seat or valve. The pump can be a multi-chamber pump.

Abstract: A portable air compressor includes a box and a compressor unit accommodated in the box. The compressor unit includes a main frame, a cylinder fitted with a piston body, a motor, and a transmission mechanism. The motor drives the transmission mechanism to have the piston body conduct reciprocating motion in the cylinder to produce compressed air, which is transferred to an air storage container. The cylinder and the main frame are integrally formed of plastic. The cylinder defines an exit hole communicating with an inner space thereof. A metal seat is integrally formed at the cylinder. The central hole of the metal seat communicates with the exit hole of the cylinder. A plug is urged by a compression spring to seal the central hole of the metal seat. The metal seat can endure high temperature within the cylinder to ensure air-tightness between the plug and the metal seat.

Abstract: A pumping cassette including a housing having at least two inlet fluid lines and at least two outlet fluid lines. At least one balancing pod within the housing and in fluid connection with the fluid paths. The balancing pod balances the flow of a first fluid and the flow of a second fluid such that the volume of the first fluid equals the volume of the second fluid. The balancing pod also includes a membrane that forms two balancing chambers. Also included in the cassette is at least two reciprocating pressure displacement membrane pumps. The pumps are within the housing and they pump the fluid from a fluid inlet to a fluid outlet line and pump the second fluid from a fluid inlet to a fluid outlet.

Abstract: A metal pump housing includes a shaft support hole for supporting a middle part of a rotary shaft. The rotary shaft includes a first end on which a pump operating portion is provided and a second end on which a motor rotor is provided. A metal motor case is fixed to a part of the pump housing that is at a side of the second end. The motor case accommodates a motor section including a motor stator and a motor rotor. A plastic circuit case member is fixed to a part of the motor case that is opposite to the part to which the pump housing is fixed. A circuit substrate for controlling the motor section is fixed to the circuit case member and is separate from the motor case.

Abstract: An inlet sieve for a self-priming floating pump features a bottom wall that is carried in a position that underlies the inlet of the self-priming floating pump at a distance therebelow with the inlet of the pump aligned with an axis that passes through the bottom wall of the sieve. A perforated outer wall of the sieve stands upward from a top side of the bottom wall and extends about the axis. The bottom wall features an outer area that spans inwardly from the perforated outer wall toward the axis, and a protuberance that bulges upwardly from the outer area to an apex of the protuberance that is situated at the axis. Water flowing inwardly toward the protuberance from different radial directions is directed smoothly upward into the inlet of the pump with minimal turbulence in order to optimize the performance of the pump.

Abstract: A scroll compressor of the present invention includes a first discharge port 35 which is in communication with a compression chamber 50, a discharge space 30H which is in communication with the first discharge port 35, a second discharge port 21 which brings the discharge space 30H into communication with a high pressure space 11, a discharge check valve 131 capable of closing the second discharge port 21, a bypass port 36 which brings the compression chamber 50 into communication with the discharge space 30H, and a bypass check valve 121 capable of closing the bypass port 36, the fixed scroll 30 can move in an axial direction of the fixed scroll between the partition plate 20 and the main bearing 60, a high pressure is applied to the discharge space 30H and according to this, the fixed scroll 30 can be pressed against the orbiting scroll 40.

Abstract: A pump is provided having a communication portion that provides continuous communication between a pump section and a discharge section in a state where a discharge-side check valve suppresses a backflow, and a size of the communication portion is set so that, when the continuously expanding and contracting pump section contracts, a volume of gas mixed in liquid in the pump section is contracted.

Abstract: A hybrid or battery type working machine including a hydraulic pump, an electric motor, an electric storage device, and a control device which controls a pump absorption horsepower maximum value in accordance with an amount of electricity stored in the electric storage device. The control device reduces the pump absorption horsepower maximum value by dividing the pump absorption horsepower maximum value into a plurality of regions having different target flow rates, and reduces the pump absorption horsepower maximum value from an old pump absorption horsepower maximum value corresponding to the pump absorption horsepower maximum value which has not yet been reduced to a new pump absorption horsepower maximum value corresponding to the pump absorption horsepower maximum value which has been reduced, so that temporal differences among the regions can increase in a descending order of a target flow rate.

Abstract: A pump having a motor, a pump base with a pump chamber, a tangential discharge and an outlet in the pump base. A riser tube extends upward from the outlet and terminates at or above a launder in order to move molten metal out of a vessel with relatively little turbulence.

Abstract: A diaphragm pump and pump system including a pump housing defined along a longitudinal axis and having one or more pumping chambers and one or more driving chambers. At least two check valves communicating with each of the one or more pumping chambers for conducting a production fluid into and out of the pumping chamber. One or more flexible axially elongated diaphragms are mounted in the pump housing and sealingly separate the one or more pumping and driving chambers. At least one cam mechanism is disposed in the pump housing and coaxially therewith the pump housing longitudinal axis. The cam mechanism is configured for rotational movement to provide for radial deflection of the one or more flexible axially elongated diaphragms into the one or more pumping chambers to affect pumping of a production fluid therethrough the diaphragm pump.

Abstract: A pump unit has an inlet valve, an outlet valve, a supply line for supplying fuel, a pumping chamber, and a plunger for pressurizing fuel in the pumping chamber. The inlet valve includes an inlet valve member movable between a first position and a second position. The inlet valve member has an aperture formed therein. The aperture provides a first fluid pathway between the pumping chamber and the supply line when the inlet valve member is in its first position, and the aperture provides a second fluid pathway between the pumping chamber and the outlet valve when the inlet valve member is in its second position.

Abstract: A valve body is provided with a discharge relief portion. A relief valve outlet is formed in an end face thereof on a central axis of the valve body. Discharge valve inlets are point-symmetrically formed with respect to the central axis. A discharge valve outlet is formed in another end face thereof and relief valve inlets are point-symmetrically formed with respect to the central axis. A discharge valve outlet and the discharge valve inlets communicate with each other. A flow of fuel from a pressurization chamber to a fuel discharge port is restricted by a discharge valve member capable of closing the discharge valve outlet. The relief valve outlet and the relief valve inlets communicate with each other. A flow of fuel from the fuel discharge port to the pressurization chamber is restricted by a relief valve member capable of closing the relief valve outlet.

Abstract: Ejector assemblies and engine systems have a pressure regulator in fluid communication with an ejector. The pressure regulator receives boost pressure and selectively allows the boost pressure to pass through a valve opening therein under selected engine conditions and into the ejector as regulated boost pressure. Both the pressure regulator and the ejector each have a conduit defining a passageway that includes a Venturi gap separating the passageway into a converging section and a first diverging section that both narrow toward the Venturi gap. The pressure regulator has a piston operatively connected to a valve mechanism positioned for movement therewith to control the passage of the boost pressure through the valve opening, and the valve mechanism defines a passage therethrough that includes a gradually narrowing portion that is narrower than the valve opening.

Abstract: A control system for a rod pumping unit is disclosed herein. The control system includes a memory device, a sensor, and a processor. The memory device is configured to store a velocity profile for controlling a sucker rod string of the rod pumping unit. The sensor is configured to take measurements for determining surface load of the sucker rod string. The processor is configured to gain access to the memory device and the velocity profile. The processor is further configured to determine a reference force. The processor is further configured to receive a measurement from the sensor and determine the surface load. The processor is further configured to compute a desired velocity for commanding the rod pumping unit. The desired velocity is computed based on a reference velocity from the velocity profile, the reference force, and the surface load.

Abstract: The compressor comprises a movable assembly carrying a suction muffler and formed by: a piston (10) having a skirt (11) with an open rear end (11a) and a closed front end (11b) which carries a suction valve (50); and an actuator. The suction muffler comprises: a first and a second tubular insert (61, 62) defining a first and a second chamber (C1, C2) and having confronting open ends (61a, 62a) spaced from each other, and closed opposite ends (61b, 62b) respectively affixed to a top wall (12) of the piston (10) and to the actuator; a third tubular insert (63) internally lining the skirt (11); and an annular passage (15), between the third and the second tubular inserts (63, 62), open to the first and second chambers (C1, C2), and communicating the open rear end (11a) of the skirt (11) with the suction valve (50).