Abstract: Systems and methods for determining proper phase rotation in a linear motor that may be used in an ESP system, where the phase rotations associated with power and return strokes are initially unknown. The method includes providing power to the motor for multiple cycles and monitoring the load (e.g., by monitoring current drawn by the motor) on the motor to determine in which direction (phase rotation) the load on the motor increases. This direction corresponds to the power stroke of the motor. The direction of increasing load is then associated with the power stroke and the motor is operated normally.

Abstract: The present invention concerns a pump for high-density powder transfer. The pump for high-density powder transportation according to the present invention has four-stroke operation, in which four pumping chambers in reality constitute a system of two pairs of chambers in line with each other. This makes it possible to divide the overall flow rate per minute over four tanks. Each of the four tanks has a reduced capacity, to the benefit of the compactness of the pump and the reduction of the loading/emptying times of the single tank, by exploiting the fluid-dynamic principle of communicating vessels the system of pairs of chambers in line increases the overall powder storage volume, thanks to a constant depression.

Abstract: A wellbore pumping system for pumping fluid, the system with a retrievable reciprocating pump selectively disposable in inner tubing (which may be e.g. production tubing or coiled tubing) movable to and from a landing structure of a bottom hole assembly (“BHA”), the BHA connected to another tubular which is an outer tubular, such as production tubing or casing, which encompasses the inner tubing.

Abstract: A downhole manifold assembly includes a manifold body defining a longitudinal axis and having a first end face, a second end face, and an outer surface extending therebetween. A fluid circuit is defined in the manifold body and includes a plurality of axially extending fluid passages and a plurality of radially extending fluid passages. The radially extending fluid passages extend to the outer surface of the manifold body. Each radially extending fluid passage defines a respective aperture in the outer surface. The manifold assembly also includes a control valve coupled to the manifold body. The control valve is positionable between a first position in which a flow of pressurized fluid is channeled through the fluid circuit in a first direction, and a second position in which the flow is reversed and the pressurized fluid is channeled through the fluid circuit in a second direction.

Abstract: A downhole tool for conveyance within a wellbore extending into a subterranean formation. The downhole tool comprises a moveable member comprising a first surface defining a moveable boundary of a first chamber, and a second surface defining a moveable boundary of a second chamber. The downhole tool further comprises hydraulic circuitry selectively operable to establish reciprocating motion of the moveable member by exposing the first chamber to an alternating one of a first pressure and a second pressure that is substantially less than the first pressure.

Abstract: A system is described for injecting small controlled amounts of fluid, such as de-emulsifier, into a flowing line at high pressure, in a high-pressure environment such as a subsea environment. The system is connected to the flowing line by tubing lines. It is enclosed either in a high-pressure vessel able to withstand high external pressure or in a vessel that is pressure-matched with the environment. The system is able to inject a controlled volume of fluid into the flowing line at relatively low injection rates.

Abstract: A reciprocating pump drive assembly for driving a reciprocation of a polish rod relative to a well casing includes a support frame which supports a pair of hydraulic actuators such that the cylinder portions thereof are fixed relative to the well casing. A mounting frame is supported at a top end thereof on the top ends of the piston portions of the hydraulic actuators so as to extend downwardly to a polish rod mounting bracket at the bottom end of the mounting frame. The top end of the polish rod is thus supported by the mounting frame so as to be suspended below the top end of the hydraulic actuators for improved access during servicing and for greater overall lateral stability of the drive assembly.

Abstract: A membrane seawater desalination pressurization and energy recovery integrated method. Piston rods of single-rod piston-type seawater cylinders are connected with single-rod piston-type hydraulic cylinders to form two or more than two working combined bodies which operate alternately. In a process that the hydraulic cylinders drive the seawater cylinders to move back and forth, one piston cavity of a seawater cylinder sucks high pressure condensed brine in the process of moving forward and drains the high pressure condensed brine in the returning process; and the other piston cavity of the seawater cylinder sucks raw seawater in the returning process, pressurizes the raw seawater in the process of moving forward and continuously and stably outputs the pressurized high pressure raw seawater to a reverse osmosis membrane module. Meanwhile, a membrane seawater desalination pressurization and energy recovery integrated device is further disclosed.

Abstract: An air-driven pump system comprising: a directional unit that defines a directional air chamber and comprises a directional piston, a first process air intake, and a second process air intake; two pump units each including a liquid chamber, an air chamber, and a piston; a shaft affixed to the pistons; an efficiency valve system comprising an efficiency piston, wherein the efficiency unit is configured to divide inlet air entering the air-driven piston pump into control air, first process air, and second process air, and wherein the efficiency piston is in communication with the control air, first process air, and second process air before the air is distributed to the directional unit; and a second shaft which is in communication with the efficiency piston. The efficiency valve system is to prevent overfilling of the air chambers.

Abstract: A method includes driving a fluid pumping unit having a plurality of pumping cylinders via a plurality of hydraulic cylinders respectively of a hydraulic power unit. The method further includes controlling activation of the hydraulic power unit such that each stroke of the corresponding piston assembly between the top dead center and the bottom dead center follows a corresponding trapezoidal velocity profile with respect to a time duration. Controlling activation includes controlling flow of a hydraulic fluid in the hydraulic power unit so as to control the corresponding trapezoidal velocity profile with respect to the time duration of the corresponding piston assembly to obtain a predefined flow rate of the fluid medium from the pumping unit.

Abstract: A distributing valve for a concrete pump and the concrete pump are provided, the distributing valve comprises a valve body (200) and a valve core (300), and a delivering cavity (213) is internally formed in the valve body (200) and is provided with a material inlet, a material outlet (212) and material suction openings (251,252). The material outlet (212) is communicated with a delivery pipe and the material suction opening (251,252) is communicated with a delivery cylinder (500). The valve core (300) is a L-shaped pipe formed by a first pipe section (310) and a second pipe section (320), and one end of the L-shaped pipe is connected with a hopper (600) and a revolution fitting surface is formed between the end face of the other end of the L-shaped pipe and the internal face of the valve body (200).

Abstract: Method for cleaning hydraulic liquid in a industrial truck, wherein said industrial truck is an electrically powered industrial truck having a battery as an energy source with a hydraulic system comprising, a hydraulic pump, a hydraulic reservoir, and a return pipe to the hydraulic reservoir with a return filter, wherein the method comprises the steps of, the hydraulic pump is activated for hydraulic activity, the hydraulic pump pumps the liquid for the hydraulic activity and in relation to this return flow through the return filter to the hydraulic reservoir occurs, the hydraulic pump can be activated by means comprised in the industrial truck, when hydraulic activity is not present, by that achieving a circulation to the hydraulic reservoir through the return filter such that sufficient filtration of the hydraulic liquid is reached, further a time Tb for circulation without hydraulic activity can be accumulated and/or a sensor for determining the quality of the hydraulic oil can be arranged in the industria

Abstract: The disclosed invention provides intelligent adaptive control for optimization of production output, energy efficiency and safety of a linear reciprocating long stroke hydraulic lift system, for use at the surface of oil and gas wells to extract fluids or gas after free flowing stopped due to natural decline of reservoir pressure. The hydraulic pump and its adaptive control system introduced in this invention are capable of optimizing its production capacity by varying multiple operating parameters, including its stroking length and speed characteristics continuously and instantaneously at any point. Merits and benefits of this invention include significant increase in production efficiency, improved durability and longevity of the pumping equipment, significant power consumption savings and an ability to adapt effectively to changing well conditions.

Abstract: A pumping device for pumping a liquid to a higher level comprises a pump having an inlet and an outlet, an inlet tube being located upstream of the inlet for guiding the fluid to the inlet, a siphon being located downstream of the outlet and an outlet tube being located downstream of the siphon for guiding the liquid from the outlet to the outlet tube via the siphon. The outlet tube extends at least beyond a front side of the pump as seen from the pump. With respect to the outlet tube the siphon extends at least partly at the opposite side of the front side.

Abstract: Detecting a failure mode of a fluid flow controller configured to control fluid flow between first and second chambers of a downhole positive displacement pump and a flow line, wherein the positive displacement pump comprises a piston moving in an axial reciprocating motion, and subsequently adjusting operation of the downhole positive displacement pump based on the detected failure mode such that the downhole positive displacement pump piston operates differently in different axial directions.

Abstract: The present invention comprises a downhole unit that includes at least one plunger and that uses a power fluid to recover production fluid from a well. The downhole unit recovers production fluid and brings it to the surface of the well during both the downward and upward motion of the at least one plunger. The downhole unit can also optionally dispose of unwanted fluids in a formation.

Abstract: An air valving system for a reciprocating piston pump (5) which uses piston (10) actuated poppet assemblies (40) to control the main air valve (16) shift. The valve exhaust is vented (50) directly to atmosphere rather than through the main exhaust to ensure reliability. A ramped detent (32) prevents the air valve (16) from centering.

Abstract: A hydraulic cylinder assembly for a fluid pump including a cylinder, a bearing attached to an approximate first end of the cylinder, a rod slideably mounted within the bearing, and a piston located about an end of the rod in the cylinder opposite the bearing. A central axis of the rod is offset from, and parallel to, a centerline of the cylinder to impede a rotation of the piston about the rod. The hydraulic cylinder assembly further including a hydraulic pump fluidly connected to the cylinder, the pump configured to provide a hydraulic pressure to the cylinder during an up-stroke of the piston and rod and the pump further configured to generate electricity on the down-stroke of the piston and rod.

Abstract: The present invention relates to a submersible pump and a submersible pump system for pumping liquid to a marine structure, the pump being adapted to be located in a tube. The pump comprises an upper portion and a lower portion. The upper portion is adapted to be connected to means for suspending the pump in the tube. The pump has a vertical direction extending from the lower portion to the upper portion. The pump further comprises an inlet for allowing the liquid into the pump and an outlet for allowing the liquid out of the pump. The pump further comprises a sealing means located downstream of the inlet and the outlet in the vertical direction, the sealing means being adapted to seal against an inner surface of the tube. The invention further relates to an arrangement for hydraulic drive of the submersible pump and to a semi-submersible unit comprising the submersible pump system.

Abstract: An auxiliary braking device can be used for wellhead applications having a progressive cavity pump. A housing of the device independently mounts on the pump's existing drive using a mounting member, and an adapter on the housing connects to a rotatable drive shaft of the pump. A hydraulic motor on the housing has a motor shaft mechanically coupled to the adapter by a plurality of gears or the like. A control valve couples to the hydraulic motor and operates to control communication of hydraulic fluid through the hydraulic motor, thereby controlling rotation of the rotatable shaft. A controller and electric sensors can operated the control valve in response to the sensed rotation of the shaft. Alternatively, mechanical mechanisms can operate the control valve in response to the rotation of the drive shaft.

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: An apparatus for removing a liquid and a material that is not a liquid in contact with the liquid from a borehole penetrating the earth includes a mechanical pump configured to pump the liquid and material from the borehole and a motor configured to be coupled to the mechanical pump. The apparatus further includes a variable speed motor drive configured to be coupled to the motor. The variable speed motor drive is configured to energize the motor in continuous cycles to operate the pump, each cycle comprising operating the pump at a first speed for a first time interval to remove the liquid and not the material and operating the pump at a second speed greater than the first speed for a second time interval to remove the liquid and the material.

Abstract: In a constant rate discharge pump, a rotary drive source is disposed on an end of a housing, and on the other end of the housing, a pump head is provided, having a pump chamber into which a fluid is drawn, and a filling chamber filled with an indirect medium. Further, a displacement mechanism having a displacement nut which is displaced under a driving action of the rotary drive source is disposed in the interior of the housing. A bellows is interposed between a tubular body connected to the displacement nut and a first block of the pump head, wherein the interior of the bellows also is filled with the indirect medium, which is made up from an incompressible fluid. Furthermore, a flexible diaphragm is disposed in the pump head between the fluid and the indirect medium.

Abstract: A method for removing a fluid and a material in contact with the fluid from a borehole penetrating the earth, the method including: operating a pump coupled to the borehole at a first speed for a first time interval to remove the fluid; and operating the pump at a second speed greater than the first speed for a second time interval to remove the fluid and the material.

Abstract: In an embodiment of the invention, a down-hole pump comprises a hydraulic chamber having a passage for fluid communications with a hydraulic conduit, a produced fluid chamber having an inlet and an outlet, a first check valve associated with the inlet, a second check valve associated with the outlet, a stored energy unit, a piston, having one side exposed to the stored energy unit and a second side exposed to the hydraulic chamber and a displacement member projecting from said piston into the produced fluid chamber. Additional embodiments and aspects, including embodiments for power units as well as system and method aspects, are also disclosed.

Abstract: A method for compressing a gas by using energy produced from a heat source. A boiler is provided. The boiler is segregated into an upper chamber and a lower chamber by a barrier such as a piston, a bellows, or a diaphragm. The lower chamber is filled with a liquid having a suitable boiling point and other properties. The upper chamber is filled with a gas to be compressed. Heat from any suitable source is applied to the liquid in the lower chamber in order to bring the liquid to a boil, and thereby produce pressurized vapor in the lower chamber. The rising pressure in the lower chamber moves the barrier in the direction of the upper chamber, thereby compressing the gas in the upper chamber.

Abstract: A pumping system is provided which is a mobile, vehicle-mounted pumping system, such as for water or fuels, which mounts on a vehicle and may be used for various applications. The pumping system operates a drive system and control system for liquid pumps almost exclusively by hydraulic fluid pressure.

Abstract: Disclosed are a hermetic compressor and a refrigeration cycle device having the same. An oil separator for separating oil from a refrigerant is installed outside a casing. The oil separated by the oil separator is recollected into the casing by an oil pump driven by a driving force of a driving motor. The oil is recollected from the refrigerant and fabrication costs are be reduced. A cooling capability of the refrigeration cycle device is enhanced, the compressor has a simplified configuration, and the fabrication costs are reduced. Because an outlet of a discharge opening through which oil is discharged to the casing from the oil pump is installed at a position lower than a minimum level of oil in the casing, the refrigerant is prevented from backflowing into an oil passage, and the occurrence of air bubbles on the surface of oil in the compressor may be prevented.

Abstract: A pressure driven pumping system includes a piston disposed within a first bore of a housing to separate a process chamber from a working chamber. A rod member coupled to the separating member extends into a reduced pressure chamber. The piston has a first face exposed to the process chamber and a second face exposed to the working chamber. The second face has an effective area less than an effective area of the first face. The housing may be placed in seawater at a selected depth. The process chamber can be in fluid communication with a well to pass well fluid into the process chamber at well pressure to move the piston, to discharge seawater from the seawater chamber. The working fluid, typically seawater in a subsea application, is pumped into the working chamber to move the piston, which discharges well fluid from the process chamber.

Abstract: A power recovery chamber is used for a positive-displacement power recovery apparatus in the seawater desalination plant or system. The power recovery chamber includes a cylinder, a piston disposed in the cylinder and capable of being reciprocated in a longitudinal direction of the cylinder, and a piston guide disposed in the cylinder and extending in the longitudinal direction of the cylinder for guiding the piston when the piston is reciprocated in the longitudinal direction of the cylinder. At least a part of an outer circumferential surface of the piston is out of contact with an inner surface of the cylinder, and the piston is brought into contact with the piston guide at a part where the piston guide passes through the piston.

Abstract: The invention relates to a pump device for feeding a delivery medium out of a deep borehole which leads from a floor level into the interior of the earth, which deep borehole is provided at least in sections with borehole piping, having a pump and having a motor which drives the pump. As a result of the motor being arranged outside the borehole piping and as a result of it being possible for the motor to be connected to the pump by means of torque transmitting means which extend laterally through the borehole piping, the motor can be protected from overheating, and in the event of a fault, can be pulled out of the deep borehole independently of the pump.

Abstract: A hydraulic cylinder assembly for a fluid pump including a cylinder, a bearing attached to an approximate first end of the cylinder, a rod slideably mounted within the bearing, and a piston located about an end of the rod in the cylinder opposite the bearing. A central axis of the rod is offset from, and parallel to, a centerline of the cylinder to impede a rotation of the piston about the rod. The hydraulic cylinder assembly further including a hydraulic pump fluidly connected to the cylinder, the pump configured to provide a hydraulic pressure to the cylinder during an up-stroke of the piston and rod and the pump further configured to generate electricity on the down-stroke of the piston and rod.

Abstract: A dense phase powder pump includes a valve body that houses one or more pinch valve elements. The valve body comprises a sufficiently transparent material to allow an operator to visually observe operation of the pinch valves.

Abstract: An embodiment in accordance with the present invention provides a hydraulic pump including a first motor running at a fixed speed, a reservoir for fluid and a first pump operatively coupled to the motor such that the pump runs at the same speed as the motor and generates a flow of fluid from the reservoir. The hydraulic pump further includes a second motor, a speed control valve operatively coupled to the to the first pump and operatively coupled to the second motor such that a portion of the flow is directed to the second motor and the remainder of the flow is diverted to the reservoir, and a second pump operatively coupled to the second motor such that the second pump is driven by the second motor.

Abstract: A pump has a pump barrel formed from a larger diameter section and a smaller diameter section. Each section has a biased piston moveable within the section and the pistons are connected together to form a variable volume chamber between the pistons. As the connected pistons move toward the larger diameter section, a volume of fluid is moved through an inlet valve into the variable volume chamber of increasing volume. When the pistons are moved toward the smaller diameter section, a differential volume of fluid is discharged from the variable volume chamber of decreasing volume through a discharge valve into a discharge conduit. The pistons are actuated to move within the pump barrel by application and release of pressure at a remote end of the discharge conduit.

Abstract: A piston type pumping apparatus comprises a vertically oriented cylinder having a top and a bottom with a first aperture. There are first and second passageways for liquid in the cylinder at the top and bottom respectively thereof. A piston is reciprocatingly mounted within the cylinder and has an area against which pressurized fluid acts in the direction of movement of the piston. A hollow piston rod is connected to the piston and extends below the piston and slidably through the first aperture. There is a reload chamber below the cylinder. The piston rod extends slidably into the reload chamber and has a third passageway for liquid communicating thereto. A first one-way valve is located in the third passageway. There is also a fourth passageway that extends from the reload chamber to a source of liquid to be pumped and a second one-way valve therein.

Abstract: A pump assembly (10) including two diesel engines (11) that are intended to operate at a relatively constant speed. The engines (11) each drive a variable displacement pump (12) that is preferably a swashplate pump. Fluid under pressure from each pump (12) drives an assembly (13) to pump a fluid such as a 95/5 emulsion, water and/or mud.

Abstract: A pump system for supplying pressurized hydraulic fluid to a hydraulic valve actuation system for operating engine valves of an internal combustion engine comprises a substantially conventional main pump, driven by the engine, which supplies the necessary volume of pressurized hydraulic fluid when the engine is running. The system comprises a booster pump that supplies in conjunction with the main pump the necessary volume of hydraulic fluid during starting/cranking of the engine. The main pump is preferably designed and constructed for operating efficiency during engine operating conditions while the booster pump is preferably designed and constructed for operating efficiency during cranking/starting of the engine.

Abstract: A method for removing a fluid and a material in contact with the fluid from a borehole penetrating the earth, the method including: operating a pump coupled to the borehole at a first speed for a first time interval to remove the fluid; and operating the pump at a second speed greater than the first speed for a second time interval to remove the fluid and the material.

Abstract: An auxiliary braking device can be used for wellhead applications having a progressive cavity pump. A housing of the device independently mounts on the pump's existing drive using a mounting member, and an adapter on the housing connects to a rotatable drive shaft of the pump. A hydraulic motor on the housing has a motor shaft mechanically coupled to the adapter by a plurality of gears or the like. A control valve couples to the hydraulic motor and operates to control communication of hydraulic fluid through the hydraulic motor, thereby controlling rotation of the rotatable shaft. A controller and electric sensors can operated the control valve in response to the sensed rotation of the shaft. Alternatively, mechanical mechanisms can operate the control valve in response to the rotation of the drive shaft.

Abstract: A single conduit lift pump is disclosed that only requires a single fluid conduit for both the driving fluid and the pumping action of the pump in a well bore. Fluid pressure communicated to the pump by the single fluid conduit drives the pump to load a resilient member. The fluid pressure is cycled off to allowing the lift of fluid by action of the resilient member upon the single fluid conduit. The single fluid conduit makes this pump suitable for downhole operations for the oil and gas production industries in wells that have substantial water cut that inhibits the production of gas.

Abstract: A pressure driven pumping system includes a piston disposed within a first bore of a housing to separate a process chamber from a working chamber. A rod member coupled to the separating member extends into a reduced pressure chamber. The piston has a first face exposed to the process chamber and a second face exposed to the working chamber. The second face has an effective area less than an effective area of the first face. The housing may be placed in seawater at a selected depth. The process chamber can be in fluid communication with a well to pass well fluid into the process chamber at well pressure to move the piston, to discharge seawater from the seawater chamber. The working fluid, typically seawater in a subsea application, is pumped into the working chamber to move the piston, which discharges well fluid from the process chamber.

Abstract: A downhole motor and pump assembly for use in a tube has a support that suspends the assembly downhole, a housing capable of forming a seal against an inside surface of the tube to divide the tube into a lower region below the seal and an upper region above the seal, an electric motor, and a power supply for the electric motor. A hydraulic pump driven by the electric motor has a high pressure output. A piston is operated by a directional valve such that the high pressure output from the hydraulic pump is directed by the directional valve alternately above and below the piston so as to reciprocate the piston. A fluid pump driven by the piston pumps well fluid from the lower region to the upper region.

Abstract: A fluid supply unit includes a hydraulic supply unit and a pressure generator for the fluid and a pressure outlet. A pressure booster is installed between the pressure generator and the pressure outlet and is rigidly mechanically connected with the pressure generator, wherein the pressure booster (6) is driven by a portion of the fluid generated by the pump.

Abstract: In an embodiment of the invention, a down-hole pump comprises a hydraulic chamber having a passage for fluid communications with a hydraulic conduit, a produced fluid chamber having an inlet and an outlet, a first check valve associated with the inlet, a second check valve associated with the outlet, a stored energy unit, a piston, having one side exposed to the stored energy unit and a second side exposed to the hydraulic chamber and a displacement member projecting from said piston into the produced fluid chamber. Additional embodiments and aspects, including embodiments for power units as well as system and method aspects, are also disclosed.

Abstract: An apparatus capable of receiving oil and gas from a recovery or other input source, compressing and/or pumping said oil and gas using multi-phase compressors with heat exchange means, and delivering said compressed gas to various destinations, including for use in oil and gas recovery.

Abstract: A compact helical compressor system for mobile use in vehicles is described. The system includes a helical compressor unit, a motor unit dedicated to the helical compressor unit for driving the helical compressor unit, and a control unit for adjusting a rotational speed of the motor unit and to generate a predefined discharge rate of compressed air from the helical compressor unit, independently of a drive assembly of the vehicle.

Abstract: A power recovery chamber is used for a positive-displacement power recovery apparatus in the seawater desalination plant or system. The power recovery chamber includes a cylinder, a piston disposed in the cylinder and capable of being reciprocated in a longitudinal direction of the cylinder, and a piston guide disposed in the cylinder and extending in the longitudinal direction of the cylinder for guiding the piston when the piston is reciprocated in the longitudinal direction of the cylinder. At least a part of an outer circumferential surface of the piston is out of contact with an inner surface of the cylinder, and the piston is brought into contact with the piston guide at a part where the piston guide passes through the piston.

Abstract: A flowable materials pump for moving flowable materials includes a substantially tubular pump housing having opposing first and second housing longitudinal open ends; an impeller assembly including an impeller rotatably mounted within and connected to the pump housing through which material flows through and around the impeller; and an impeller drive mechanism extending through the housing wall to and drivably connected to the impeller. The laterally position of the impeller drive mechanism relative to the pump housing permits stacking of the flowable materials pumps in linear series and in mutual fluid communication, so that the desired level of pumping force can be established incrementally by selecting the number of the pumps needed for a given application.

Abstract: Compressors are provided which include a motor having a drive shaft; a compression chamber, having an inlet and an outlet; a diaphragm, disposed within the compression chamber such that when the diaphragm is deflected back and forth between a first position and a second position air is drawn in through the inlet and forced out through the outlet; a crankshaft, operatively connected to the drive shaft; a shuttle, configured to be displaced transversely by rotational movement of the crankshaft, and positioned to deflect the diaphragm by its transverse movement; and a guide configured to inhibit non-transverse motion of the shuttle. In some implementations, the compressor occupies a total volume of less than about 15 cubic inches.