Abstract: The invention relates to a fuel delivery pump for a fuel injection pump for internal combustion engines, with a pair of rotating displacing elements, which deliver fuel from an intake chamber connected to a storage tank, along a supply conduit that is formed between the end face of the rotating displacing elements and the circumference wall of the pump chamber, into a pressure chamber connected to the fuel injection pump, and with a bypass conduit, which is integrated into a housing of the fuel delivery pump and connects the intake chamber to the pressure chamber, and which is opened by means of a pressure valve disposed in it, wherein the intake chamber is closed with a check valve that operates counter to the fuel delivery direction.

Abstract: A device for pumping an absorbent solution from the low pressure side of an absorption heat exchange system to the high pressure side of that system without relying on pressure from the low pressure side. The device preferably includes a diaphragm pump disposed in an absorbent fluid pathway to pull absorbent solution from the low pressure side and to push absorbent solution into the high pressure side. The diaphragm of the diaphragm pump is powered by a piston-driven hydraulic pump which pushes and pulls oil into and out of the diaphragm pump. The hydraulic pump preferably has sufficient power to pull absorbent solution from the low pressure side of the heat exchange system without relying on any pressure from the low side. Check valves are used to permit the one-way flow of absorbent solution from the low pressure side to the high pressure side of the system.

Abstract: A scroll compressor (A) includes a barrier wall (25) which divides the internal cavity of a casing (1) into a discharge chamber (22) and a suction chamber (23) and has a discharge opening (25b) for providing the communication of the compartments (22) and (23), a check valve (27) operable to prevent a flow of gas from the discharge chamber (22) into the suction chamber (23), and a scroll compression mechanism (3) which is provided in the suction chamber (23), which a space (36) left between the mechanism (3) and the barrier wall (25), for discharging compressed gas into the space (36). In addition, a valve (31) is provided in the space (36) which has a seal member (32) operable to interrupt the communication of an inner compartment (34) with an outer compartment (35) of the space (36) during the correct operation period while on the other hand providing the communication during the reverse operation period.

Abstract: A fuel delivery pump for a fuel injection pump for internal combustion engines, which includes a pair of gears that mesh with each other and are driven to rotate in a pump chamber. The gears deliver fuel from an intake chamber connected to a storage tank, along a supply conduit that is formed between the end face of the gears and the circumference wall of the pump chamber, into a pressure chamber connected to the fuel injection pump. A conduit is integrated into a housing of the fuel delivery pump and connects the intake chamber to the pressure chamber. The conduit can be opened by means of a pressure valve disposed in it, wherein the pressure valve is functionally connected to a throttle valve that throttles the fuel supply into the intake chamber as a function of the controlled pressure on the control valve via the pressure chamber.

Abstract: A hydraulic refill valving apparatus can be removed from the front of a metering pump without requiring the entire displacement chamber to be removed from the pump drive mechanism. The valving apparatus separately mounts a mechanically actuated refill valve and a refill check valve such that they can be removed from the front of the pump with relative ease, leaving the displacement chamber connected to the drive mechanism with the sealing gasket therebetween. By separating the refill valve and refill check valve functions into two separate assemblies, the apparatus is made more reliable in that it is less susceptible to problems encountered with relatively high viscosity working fluid.

Abstract: An air pumping station for a pneumatic toy vehicle powered by a re-fillable compressed air bottle or canister includes a stabilizing base having a flat ground engaging horizontal lateral bottom including a horizontal projecting geometry proportioned for placement under the feet of the user. The station also includes a fluid-tight vertical cylindrical housing. The station includes a reciprocating piston having a first end in fluid tight relation to interior walls of the housing and a second end defining hand-grippable pumping handles. The station has an air intake valve for the cylindrical housing. The pumping station includes an element for selectable clamping and unclamping of the toy vehicle to at least a first surface of the cylinder, however offset therefrom by a sufficient distance to avoid the reciprocal movement of the piston and grippable pumping handles. The cylinder includes an air exhaust aperture in fluid communication with the base of the cylinder.

Abstract: A high pressure hydraulic diaphragm pump having a pressure chamber on one side of a diaphragm and a fluid delivery chamber on the other side of the diaphragm with a reciprocating piston assembly including a piston member being provided for pressurizing the hydraulic fluid in the pressure chamber and having the pressure chamber connected with a pressure regulator which maintains the desired discharge pressure of the fluid and in which the piston assembly is combined with a diaphragm positioning mechanism for maintaining the diaphragm at a desired position relative to the piston member so as to assure full stroke of the diaphragm during normal operation of the pump.

Abstract: A bicycle tire pump includes a cylinder having two passages defined therethrough which are separated by a board, two openings respectively defined in a top of the cylinder and communicating with the two passages into which two pistons are respectively and movably received. A head is mounted to the top of the cylinder and has two ways defined therein which respectively communicate with the two passages in the cylinder and an outlet of the head. A bolt extends through one of the two passages and is threadedly connected to the head. The bolt has a longitudinal passage defined therethrough which communicates with one of the two ways.

Abstract: A unique method of operating a scroll compressor includes the steps of opening a capacity modulation unloader valve slightly before shutdown of the scroll compressor. By opening the unloader valve, the occurrence of unpowered reverse rotation is reduced or eliminated. Most preferably, the unloader valve communicates an economizer line to a suction inlet line.

Abstract: The dimension of a compressor is decreased, to facilitate the installation of the compressor in a limited space, by installing a relief valve (50) in such a manner that the relief valve (50) does not protrude from the outer peripheral surface of a closed housing (1) of a compressor, in which a compression mechanism, incorporated in a closed housing, is driven by an external drive source via an electromagnetic clutch.The means for achieving the above object is to assemble the relief valve (50) to the closed housing (1) in such a manner that the relief valve (50) does not protrude from the outer peripheral surface of the housing (1) in order to discharge gas to the outside when the gas pressure in the closed housing (1) increases abnormally.

Abstract: The invention is a water wheel supplying energy to a pump. The pump will typically be used to apply chemical treatments to the water stream. Some examples of chemicals to be added are acids or bases to bring the pH to an acceptable level, precipitation aids for suspending metal out of water, coagulants to aid in filtering dissolved solids out of water, flocculants to aid in filtering dissolved ions out of water, chlorine, or coloring to prevent growth of algae.

Abstract: A vacuum apparatus including at least one vacuum pump having at least one stage and high-vacuum and fore vacuum connections, and a connection line communicating a point located between the high vacuum and fore vacuum connections with the high vacuum connection; and a method for controlling a suction speed of the at least one vacuum pump.

Abstract: A pump comprises a pair of coaxial pistons, one slidably positioned in the other for simultaneous compression causing similarly directed air flow, independent passages and valves for permitting air flow from each piston into the pump head for increased air flow, and a switching device for selectively opening one passage to ambient to decrease the air flow into the pump head. The pump thus has two modes, namely a high volume mode when the two pistons operate simultaneously to direct combined air flow and a high pressure mode when the passage is opened to ambient to direct air flow from only one of the two pistons.

Abstract: The invention relates to a variable-displacement screw-type compressor with at least one main rotor and at least one subsidiary rotor which are fitted in the same housing, mesh together and convey a medium to be compressed from an inlet to an outlet, in which the inlet is bounded by at least one housing segment fitted to slide in the housing which follows the shape of the rotor casings on its sealing side facing the rotors. At least one housing segment is guided and movable transversely to the rotor axes.

Abstract: In a displacement pump for pumping pressure medium out of a container to a consumer, in particular a servo-assisted steering system for motor vehicles, a pump package (2) is inserted into the interior of a housing (1). The pump package (2) comprises a rotor (3), a cam ring (4) and a plurality of operating rods (5). Between the cam ring (4) and the rotor (3), work chambers divided by the operating rods (5) are formed, which are bounded in the axial direction by control plates (8, 9). A bypass flow limiting to valve (11) is used to regulate an effective flow. A throttle (12) of the bypass flow limiting valve (11) is formed by at least one bore. The throttle (12) is embodied in a throttle insert (13), which to adjust a characteristic effective flow curve can be mounted in various positions between a pressure chamber of the pump and the bypass flow limiting valve (11). To that end, the throttle insert (13) is integrated with a control plate (9).

Abstract: An air compressor system having an actuator for controlling the energization of the primary and start windings of the compressor motor and the state of a relief valve is disclosed. No power is applied to either of the windings and said valve is closed when the actuator is disposed in the first position. Movement of the actuator to the second position energizes both of the windings and opens the relief valve so that the motor and compressor can reach full speed before a load is applied. When the actuator is released and moved to the third position, the start winding is deenergized and the relief valve is closed to allow an air storage tank to be filled.

Abstract: An electronically controlled diesel engine for a vehicle which may act as an air compressor in addition to acting as a power source for the vehicle. When acting in the air compressor function, one end cylinder is converted to the function to provide compressed air to air tanks on the vehicle. The air from this combination compressor and power cylinder may be used to fill air tanks which provide air for braking in vehicles such as heavy trucks. The combination compressor and power cylinder has an exhaust isolation valve in the exhaust manifold to isolate an air collection area and a relief/check valve engaged on an upstream side to the air collection area and to an air tank in the air system for the vehicle on the downstream side. An electronic controller means controls the fuel injector for the combination compressor and power cylinder and the exhaust isolation valve. Various types of diesel engines may be modified to become an electronic engine-air compressor system in accordance with this invention.

Abstract: The dual stage, dual mode air pump is selectively operable in a low pressure, high volume mode or a high pressure, low volume mode. It includes a pump head, an outer tube that is engaged to the pump head, an inner tube that is engaged to the pump head and a middle tube that is slidably engaged to both the outer tube and the inner tube. A mode pump switch is utilized to allow the pump operator to change the mode of the pump. In the preferred embodiment, the mode switch is disposed within the pump head. It includes an air passageway having a manually switchable valve disposed therein. In the high volume, low pressure mode the valve switch is closed, whereupon pumped air passes into a pneumatic article engaged to the end of the pump. When the valve switch is opened, the pump is operable in the low volume high pressure mode, and a portion of the pumped air is outletted into the ambient environment, rather than being pumped into the pneumatic article.

Abstract: In a scroll type compressor wherein a fixed scroll (8) has an end plate (8b) and an involute vane (8a) fixed to the end plate and is coupled to a movable scroll (5) so as to define a pair of working spaces therebetween, the end plate of the fixed scroll are formed a pair of cylinders each of which communicates with the working spaces via bypass holes (15a) and (15b) formed in the end plate of the fixed scroll. In each of the cylinders, a cylindrical piston valve member (10) is slidably received for opening and closing the bypass holes. Opening or closing of each bypass hole is determined depending on a position of an axial end of the piston valve member relative to the corresponding bypass hole.

Abstract: The position of a screw compressor slide valve in a refrigeration system is controlled using compressor discharge gas sourced from a location where the gas is relatively oil-free and has undergone little or no pressure drop subsequent to its discharge from the compressor's working chamber.

Abstract: The stroking speed of an antisurge control valve is impeded by the combined damping effects of signal dead time and the inherent lag of ancillary pneumatic components within a primary control loop. Furthermore, as control valve actuator size increases, the negative influence of these two impediments (dead time and lag) is amplified. As a result, control valve response times are adversely affected; and the possibilities of surge-induced compressor damage and process upsets are heightened. For these reasons, this disclosure relates to a method for protecting turbocompressors from impending surge, and for preventing subsequent process upsets, by improving antisurge control. But more specifically, it describes a technique for decreasing damping effects by evacuating control valve actuators (diaphragm or piston) through restrictions having a lower resistance to compressible-fluid flow rather than through volume boosters--consequently, increasing a control valve's opening speed to that of an emergency shutdown.

Abstract: Simplified capacity control mechanisms for scroll compressors include a fork operable to open and close vents associated with a pair of scroll compression chambers. A single fork opens and closes both vents simultaneously. In the past, separate members have been utilized to open and close the two individual valves, and they have sometimes been actuated in a non-synchronous manner. A control associated With the fork is operable to move the fork between the open and closed positions by simple electronic controls. In several embodiments, the electronic controls are operated simply to stop and start the electric motor for driving the compressor. Pressure forces on and associated valve element move the fork to the desired position between the open and closed positions. No separate control wires, or separate electronic valves, need to pass into the scroll housing. In another embodiment, an electric solenoid is actuated to move the fork between open and closed positions.

Abstract: A fuel pump is disclosed which comprises a plunger reciprocable under the influence of a cam surface. The cam surface is shaped to include a first region and a second region. As the plunger moves under the influence of the first region, a pressure wave is generated which is able to reach a spill valve prior to the plunger moving under the influence of the second region to generate a pressure sufficient to open a delivery valve.

Abstract: An improved valve assembly for automatically priming a hydraulic pump during a suction-fed application wherein the pump must draw fluid from within a holding tank for subsequent pressurization and transmission by the pump. The valve assembly of the present invention is provided in fluid communication with the outlet line of the pump and is capable of sensing the difference between fluid and air such that the air disposed within the pump at start-up may be quickly and efficiently bled from the system before the valve automatically closes once the fluid has been drawn into the pump in an amount sufficient to bring the pump into a fully primed condition. The valve assembly includes a housing member, a poppet member, a biasing means, and sealing means. The housing member includes a bore extending between an inlet aperture and an outlet aperture, and a slotted shoulder member extending radially inward from the inlet aperture.

Abstract: A pumping device includes a tubular member and a piston reciprocatingly received in the tubular member, the piston together with the tubular member defining a chamber. A head is securely, sealingly mounted to an end of the tubular member. The head includes a compartment defined therein and in fluid communication with the chamber of the tubular member. An elastic nozzle is securely mounted in the compartment and includes a through hole for receiving a valve of a bicycle tire. The elastic nozzle further includes a recessed clamping section defined in an inner periphery thereof for securely clamping the valve during reciprocating motion of the piston in the tubular member.

Abstract: An inlet pipe (7) and a discharge pipe (9) of a centrifugal compressor (1) are provided with respective solenoid valves (16, 17) for allowing a flow of fluid in a direction of flow under operation of fluid compression. One end of a bypass pipe (20) is connected to a part of the inlet pipe (7) located between the solenoid valve (16) and an impeller room (6). The other end of the bypass pipe (20) is connected to a part of the discharge pipe (9) located between the impeller room (6) and the solenoid valve (17). The bypass pipe (20) is provided with a solenoid valve (21) which closes under operation of fluid compression of the centrifugal compressor (1) while opening under deactivating operation of the centrifugal compressor (1).

Abstract: A fluid transfer system employing a roller pump for squeezing an elastically deformable tube by a roller to allow fluid to be transferred from a transfer source to a transfer destination, said fluid transfer system being characterized by comprising: a short-cut passageway connecting between an inlet passageway and an outlet passageway of said tube fitted onto said roller pump; and a passageway switching means for selectively bringing fluid into fluid communication with said short-cut passageway.

Abstract: A refrigerant compressor includes a compressor housing divided by a valve plate into a first chamber and a second chamber. The valve plate includes suction conduits linking the first chamber with the suction chamber and discharge conduits linking the first chamber with the discharge chamber. A suction valve member bends to open and close the suction conduits in response to changes in discharge chamber pressure and the resulting pressure difference between the first chamber and the suction chamber. A suction valve control mechanism includes a regulator for regulating the opening and closing of the suction conduit between a maximum opening position and a minimum opening position in response to changes in discharge chamber pressure. Consquently, a starting torque shock to the compressor is reduced while maintaining high volumetric efficiency of the compressor.

Abstract: A flow rate control device for a pump includes a housing, a choke tubular passageway connected between a pump pressure chamber and an output chamber, a spool valve which is slidably provided in the housing, and which has both ends exposed in the pump pressure chamber and the pressure reducing chamber, respectively, the spool valve causing a pressure medium to flow from the pump pressure chamber into the by-pass port as much as the spool valve slides in an axial direction thereof. In the device, the choke tubular passageway is formed in a central shaft member arranged in the housing, and a sleeve member is provided around the central shaft member, the sleeve member being moved, from the pump pressure chamber towards the pressure reducing chamber, with respect to the central shaft member, in such a manner as to change the opening area of the choke tubular passageway.

Abstract: There is disclosed a preform for an air pump and relief valve assembly which has an assembly body with a substantially flat bottom and molded entirely of a flexible plastic to form a bulbous extremity on one end of the body and open at its bottom and a relief valve recess adjacent the opposite end of said body and open to a valve port in said bottom wall with at least one, and preferably two, internal passages open to the interior of the bulbous extremity and extending through said assembly body to a second port open at the bottom wall, with a substantially planar base flange extending about said body and peripherally about said bulbous extremity and said relief valve recess. The preform can be sealed to a flat sheet of plastic to complete the pump and relief valve and for this purpose has a transverse tunnel located between said internal passage and the bottom wall.

Abstract: The position of a slide valve in a screw compressor in a refrigeration system is controlled using a gaseous medium sourced from two or more sources of such fluid, both of which are in open flow communication with the slide valve actuating piston when the slide valve load solenoid is open. Preferred gas sources are a closed compression pocket in the working chamber of the compressor and the discharge passage downstream of the compressor's working chamber. Gas at sufficiently high pressure is available whenever the compressor is operating to ensure that the compressor will load under all conditions within the compressor's operating envelope.

Abstract: The invention concerns a device for opening and closing a closure cap (16) fitted over a cleaning aperture (10) in the floor of the discharge container (12) of a pump (14) for thick-bodies fluids. The cap (16) is linked to a hydraulic drive unit (20) and can be swung out hydraulically, when a control valve (48) is actuated, into the open position in which the discharge outlet is left open. The cap (16) is swung back into the closed position by means of a hand-operated lever (23), the hydraulic drive unit (20) being returned at the same time to its initial position.

Abstract: At least two progressing cavity pumps or pump sections are connected in series. The flow volume rate of the second pump or pump section is less than the flow volume rate of the first pump or pump section. If there are more than two pumps or pumps sections, the flow volume rate of the third pump or pump section would be less than the flow volume rate of the second pump or pump section, and so on. The cascade arrangement of progressing cavity pumps can be achieved by interconnecting separate pump assemblies end to end. The cascade arrangement of progressing cavity pump sections can be achieved by the attachment of the rotor/stator pairs of each pump section in series with suitable universal mechanisms and housings. Such a cascade arrangement of progressing cavity pumps or pump sections allows and compensates for the compressibility of the gas in the two-phase or multi-phase fluid being pumped, especially in pumping operations requiring high differential pressures.

Abstract: A scroll machine has an intermediate pressure cavity which is operable to open and close a leakage path between the discharge zone and the suction zone of the scroll machine. The leakage path is closed when intermediate pressurized fluid is supplied to the cavity and the leakage path is open when the cavity is open to the suction zone of the compressor. A valve (102) which can be mechanical or electrical is used to open and close a passageway extending between the cavity and the suction zone of the machine. A high pressure relief valve is incorporated into the design of the compressor to prevent slugging. The high pressure relief valve will release the intermediate pressurized fluid to suction and/or discharge when the pressure within the intermediate pressure cavity exceeds a predetermined value.

Abstract: A compressor has a compression chamber and a discharge region. The discharge region receives the compressed gas discharged from the compression chamber. A relief valve is mounted to inside of the wall in the discharge region. The relief valve connects the discharge region with the exterior of the compressor so as to discharge the excessively raised pressure in the discharge region.

Abstract: A pump assembly (20) includes a rotor (40) and a stator (38) which are disposed within a housing (24) and partially define pumping chambers (56). Fluid is conducted through an inlet passage (104) to an inlet cavity (58) which is connected with the pumping chambers (56). Fluid is conducted from the pumping chambers (56) to an outlet (62) from the pump assembly (20). A tubular passage liner (112) is disposed in the inlet passage (104) and has a straight passage (138) through which fluid flow is conducted to the inlet cavity (58). The tubular passage liner (112) prevents erosion of the housing (24) during conduction through the inlet passage (104) of inlet fluid and fluid bypassed from the outlet (62) of the pump assembly (20). Projections (204 and 206) at one end of the tubular passage liner (112) are engageable with the stator (38) to limit movement of the tubular passage liner relative to the stator.

Abstract: The internally axed single-rotation machine has inlet and outlet channels , 6), which extend arcuately round the circular cylindrical housing space (11) enclosing the rotors (1, 2) to such an extent that the tangentially connecting inlet and outlet connections (12, 13) cross and the outlet channel (6) extends over part of the inlet channel (5). In the vicinity of this approach between the outlet and inlet channels (6, 5) there is a flow connection (19), which continues the arcuate shape of the outlet channel (6) to that of the inlet channel (5). The gas pressure in the outlet channel (6) is variable by a control element (20) located in said flow connection (19). The single-rotation machine pressure control is associated with minimum noise generation and minimum flow losses and a particularly compact construction is obtained.

Abstract: The compressor has a cylinder chamber, a control plate provided with an inlet hole, a gas exchange chamber, and gas supply passages. The cylinder chamber is in communication with the gas exchange chamber via the inlet hole in the control plate. The gas exchange chamber is in communication with the outside via the gas supply passages. When the displacement is small, a part of refrigerant gas inside the cylinder chamber is bypassed to the gas exchange chamber from the inlet hole in the control plate. Therefore, great pressure variations are induced in the gas exchange chamber, but the gas exchange chamber is in communication with the outside via the considerably long gas supply passages. These passages mitigate the pressure variations transmitted to the outside. Furthermore, the passages act also as a muffler. Consequently, pressure variations inside the gas exchange chamber are prevented from being transmitted to external piping and so on; otherwise noise would be produced.

Abstract: An IV pump actuates a disposable cassette having two parallel fluid paths that include first and second pumping chambers. The disposable cassette (12) has a housing(14) that includes a back portion (152) in which is defined a fluid path (60) between an inlet port (16) and an outlet port (18). An elastomeric membrane (150) is sealed between the back portion and a front portion (52). The elastomeric membrane is exposed through the front portion at a first pumping chamber (82), a second pumping chamber (84), inlet valves (70, 76), and outlet valves (86, 92). The inlet valves operate in a fully open mode, a fully closed mode, and a cracking mode. The cracking mode of the inlet valve occurs as the elastomeric membrane is initially forced further into the pumping chamber. If the pressure of the fluid in the pumping chamber exceeds a predetermined cracking pressure, the inlet valve is forced open so that the fluid flows from the pumping chamber back toward the inlet port.

Abstract: A pump apparatus includes a pump having a suction port and a discharge port for discharging the fluid sucked from the suction port, a return passage connecting the discharge port with the suction port for returning a portion of the fluid discharged from the discharge port into the suction port, a return flow control valve disposed in the return passage for controlling an amount of the portion of the fluid returned to the suction port through the return passage and an expanded chamber formed in the return passage and located between the suction port and the return flow control valve. The expanded chamber has a sectional area larger than that of the return passage.

Abstract: A reciprocating pump particularly useful in ventilator apparatus includes a piston reciprocatable axially within a cylinder and dividing its interior into an inlet chamber and an outlet chamber, a wall fixed within the inlet chamber, and a drive housing fixed to the wall. The drive housing includes a motor, a rotor rotatable by the motor, a nut rotatable within the drive housing, and a screw threadedly coupled at one end to the nut and fixed at its opposite end to the piston. The piston is substantially unrestrained for axial and rotary movement such that forward and reverse rotation of the nut by the motor reciprocates the screw and the piston axially of the cylinder, and also permits the screw and the piston to rotate with respect to the cylinder to thereby even out wear between the piston and cylinder.

Abstract: An adjustable one-way rotary liquid pumping device including a housing, a cover fixedly engaged with the housing, a first bearing a first bearing fitted in the housing, a second bearing fitted in the cover, an axle extending through the housing and the cover and supported by the two bearings, a rotor fixedly mounted on the axle and having a plurality of pawls, a collar enclosing the rotor, a seat having two protuberances supporting the collar thereby locating the collar at an eccentric position with respect to the axle, a plurality of rollers each fitted between every two of the pawls of the rotor, a plurality of springs urging respective rollers against an inner wall of the housing and an inclined side of the pawls, and an adjustable valve fitted through the housing, the collar, and the seat, whereby the liquid can be pumped in one direction only and the speed of the axle can be adjusted as required.

Abstract: A scroll-type refrigerant compressor having a movable scroll unit and a stationary scroll unit which has a fixed stationary end plate in which a plurality of bypass ports and a discharge port are formed through which the refrigerant compressed in the pockets formed between the movable and stationary scroll units is discharged via check valves covering the bypass ports and the discharge port and preventing a reverse flow of the discharged refrigerant into the pockets. The compressor further having a suction port fluidly connected to an evaporator of an air-conditioning system, a delivery port fluidly connected to a condenser of the air-conditioning system, and a fluid channel for providing a fluid communication between the suction and delivery ports via a solenoid-operated valve for blocking and unblocking the fluid channel. The compressor can be switched from the ordinary 100% capacity to 0% capacity and vice versa.

Abstract: An improved sampling pump has utility for withdrawing fluid from a pressurized source and outputting fluid to a sampling container. The fluid pump assembly of the present invention includes an operator unit for reciprocating a plunger, and a side body port positioned within the pump body for receiving a removable filter. A pressure regulator has an inlet positioned within a side body port of the pump body and regulator outlet port in fluid communication with the operator unit. A collar rotatable with respect to a regulator housing is provided for reducing installation costs and for optionally removing condensate from the regulator. An adjustable discharge valve is pressure balanced for increasing the reliability of the pump. An improved seal is utilized for dynamic seal engagement between the pump body and the pump plunger.

Abstract: Fuel injection system for an internal combustion engine with direct fuel injection, with an electromagnetic control valve for pressurization of a medium-pressure space, and a hydraulic amplification plunger comprising a medium-pressure plunger adjacent to the medium-pressure space and a high-pressure plunger adjacent to a high-pressure space, which latter is connected to a fuel delivery line on the one side and a nozzle space surrounding the fuel needle on the other side, the high-pressure space connecting to a fuel bypass line in at least one intermediate position of the high-pressure plunger. To improve rate shaping, especially at the beginning and end of injection, the proposal is put forward that in addition to the high-pressure plunger a pressure-dependent bypass valve be located in the flow path between the high-pressure space and the fuel bypass line, which bypass valve opens the flow connection between high-pressure space and fuel bypass line for a narrow range of pressures in the high-pressure space.

Abstract: A hydraulic pump having a flow control valve for recirculating a fraction of the discharge of a rotating group of the pump and an externally adjustable pressure relief valve. The flow control valve includes a cylindrical bore in a housing of the pump, a discharge passage intersecting the bore, a recirculation passage intersecting the bore, and a valve spool slideable in the bore. A valve body on the housing closes an open end of the cylindrical bore and cooperates with the valve spool in defining a spring chamber connected to the discharge passage. A spring in the spring chamber biases the valve spool to a position corresponding to zero recirculation. The relief valve includes a stepped bore in the valve body, a valve seat in the stepped bore, a valve element, a spring biasing the valve element against the valve seat, and a spherical metal spring seat interference fitted in the stepped bore.

Abstract: An air compressor in which oil loss due to the pressure in the cylinder becoming negative during an unload can be prevented, thereby protecting an outlet-side unloader valve. An air leak hole with a specific ventilating resistance is formed between a valve body and a valve seat of an intake-side unloader valve when the intake-side unloader valve is closed. Also, a valve seat portion is provided, which cuts off a sliding portion of the outlet-side unloader valve from the outlet passage when the outlet-side unloader valve is opened.

Abstract: A fuel pumping apparatus comprises a pumping plunger reciprocable in a bore to supply fuel to the cylinders of an associated engine. A spill valve arrangement is provided to control fuel delivery, the spill valve arrangement including a valve member coupled to a first piston which is slidable within a first cylinder. Passage means are provided in the first piston interconnecting the ends of the first cylinder permitting restricted flow therebetween. A second piston slidable within a second cylinder is arranged to engage an end of the first piston, a spring biasing the second piston towards the first piston and biasing the valve member into engagement with a valve seat. In use, at high engine speed the pressure of fuel between the pistons increases, separating the pistons permitting fuel to escape through a passage provided in the second piston. Such an escape of fuel results in additional fresh, cool, fuel being drawn into the pumping apparatus thus cooling the pumping apparatus.

Abstract: A scroll-type machine is disclosed which is particularly well suited for use as a compressor in refrigeration and air conditioning systems and incorporates a unique arrangement for modulating the capacity thereof. In one group of embodiments the capacity of the scroll-type machine is modulated by relative axial movement between the scroll members so as to form a leakage path across the wrap tips and opposed end plates. In another group of embodiments, modulation is achieved by reducing the orbital radius of one of the scroll members to thereby form a leakage path across the flank surfaces of the wraps. Both types of scroll separation may be accomplished in a time pulsed manner to thereby enable a full range of modulation with the duration of the loading and unloading periods being selected to maximize the efficiency of the overall system.

Abstract: A linear hydraulic actuator has a reciprocating pump which provides pressurized hydraulic fluid contained in a reservoir to a hydraulic cylinder in which slides a piston which supplies the actuator output. A diverter valve in flow communication with the pressurized hydraulic fluid has an adjustment shaft allowing manual adjustment of the rate of flow of pressurized hydraulic fluid to the cylinder. Preferably the pump is immersed in the hydraulic fluid held by the reservoir, and the adjustment shaft of the diverter valve penetrates a wall of the reservoir to allow external adjustment of the diverter valve.