Abstract: A shaft arrangement for a steering gear has an input shaft, an output shaft and a torsion rod. The torsion rod is connected in a rotationally secure manner to the input shaft in an input-side connection region of the shaft arrangement. The torsion rod is connected in a rotationally secure manner to the output shaft in an output-side connection region of the shaft arrangement. The input-side connection region is spaced apart from the output-side connection region. The shaft arrangement has a rotation prevention member, wherein the rotation prevention member limits a rotation of the input shaft relative to the output shaft to a maximum rotation angle and, when the maximum rotation angle is reached, can transmit a torque from the input shaft to the output shaft.

Abstract: A hydraulic machine (1) such as a pump or motor includes a working section (6) such as a gerotor. A spool (3) is rotatable about an axis (4) within a bore of the machine housing (2). The spool includes hydraulic fluid directing passages that enable operation of the machine. The spool includes first and second axially spaced apart circumferential grooves (14, 15). A plurality of first axial grooves (16) extend in intersecting relation with the first circumferential groove and a plurality of second axial grooves (17) extend in intersecting relation with the second circumferential groove. The first and second axial grooves are arranged in alternating relation about the circumference of the spool. The circumferential grooves are bounded radially inwardly by respective bottom walls (19, 22) that have a greater radial distance from the axis with axial proximity to the intersecting grooves.

Abstract: An inflating pump includes an enclosure having an exterior shell and an enclosing wall located in the exterior shell and enclosing an airflow passage, and a discharge space formed between the exterior shell and the enclosing wall; an air blower connected to the enclosing wall; two air delivery pipes; and an airflow switching mechanism including a fixed seat having a plurality of chambers separately communicable with the airflow passage, the discharge space, the air blower and the two air delivery pipe, and a turnable member being turnable relative to the fixed seat for some of the chambers to communicate with one another to allow airflow pushed out from the air blower to flow through the airflow passage, the discharge space or the two air delivery pipes. Therefore, the inflating pump can inflate and deflate an inflatable air bed when the air blower constantly produces airflow in the same direction.

Abstract: The present disclosure provides a milk distribution system, components thereof, and methods of use thereof.

Abstract: A hydraulic tool can include a hydraulic cylinder, a piston within the hydraulic cylinder, and a rotary valve. The piston can be configured to move between a retracted position and an extended position. The piston can include a piston ram and a piston rod that define a ram side and a rod side inside the hydraulic cylinder. The rotary valve can be moved between a first position and a second position. The first position can be configured to direct flow at a first variable speed and a first variable force to the ram side of the hydraulic cylinder and the second position can be configured to direct flow at a second variable speed and a second variable force to the rod side of the hydraulic cylinder.

Abstract: A gas dosing apparatus is provided that includes an inlet configured to receive gas, and a directional control valve connected to the inlet and having a first position and a second position. The gas dosing apparatus also includes a fixed volume reservoir connected to the directional control valve and receiving gas from the inlet, via the directional control valve, while the directional control valve is in the first position. The gas dosing apparatus further includes an outlet connected to the directional control valve and outputting a gas dose received from the fixed volume reservoir, via the directional control valve, while the directional control valve is in the second position.

Abstract: The invention relates to a valve for controlling a coolant circuit of a refrigerating system, having a housing, which has at least one inlet opening and at least one outlet opening, having a regulating chamber provided in the housing, which extends between the at least one inlet opening and the at least one outlet opening, having a valve arrangement, which is insertable at least partially into the regulating chamber, having a rotary slide arrangement, arranged in the regulating chamber, which has a control disc, which is rotatable in relation to the at least one rotary slide support, the at least one rotary slide support is provided non-rotationally to the housing and the at least one rotary slide support is mounted floatingly to the housing.

Abstract: A sensor system for swimming pools and spas is detailed herein. The sensor system can include one or more sensors positioned in a sensor housing located within a cavity of a pipe and in-line with an inlet and an outlet of the pipe. The sensor housing can divert a portion of water flowing through the cavity to an interior of the sensor housing and to an area around the sensors and maintain at least some of the diverted water in the area around the sensors even if the water is not flowing through or is drained from the pipe.

Abstract: A fluid valve for a sample separation apparatus includes a first valve component and a second valve component, which are adjacent to one another and movable relative to one another. The valve components are configured such that, in at least one switching state, at least one switchable fluid channel is formed between the valve components, and at least one part of a surface of at least one of the first valve component and the second valve component is provided with a coating containing gold and/or platinum.

Abstract: A respiratory system, primarily to provide a mechanical insufflation/exsufflation therapy, may include a first pressure generating source, a second pressure generating source and a primary valve to switch between insufflation/positive pressure flow and exsufflation/negative pressure flow, and to generate oscillations alongside either of these cycles. The respiratory system can optionally employ a secondary valve either on a fluidic path of the first pressure generating source or on a fluidic path of the second pressure generating source. An interfacing assembly acts as a fluidic conduit between the pressure generating sources and the patient. A control unit is configured to generate required pressurized flow and oscillations as per the user settings. The aforesaid valves can be manipulated into multiple orientations/positions, which are aligned and/or adjusted with respect to the respective pressure generating sources as per the therapy requirements.

Abstract: Apparatus for injection molding of plastic materials comprising a mold including at least one plate, a hot runner distributor of the fluid plastic material, at least one injector and an actuator for controlling the opening and the closing of the injector, supported by the distributor and whose cooling is carried out by means of thermal exchange contact with the plate. Provided for the cooling of the jack actuator provided for is at least one cover made of thermally conductive material at least partly surrounding the actuator in an axially slidable manner and it is maintained in thermal exchange contact with the plate by means of a magnetic or an electro-magnetic force.

Abstract: A metal sleeve including a metal body which surrounds an inner channel running between a proximal and a distal opening. The inner channel has at least one groove set back into the metal body, running in the longitudinal direction of the inner channel and stepped on both sides by a distal and a proximal front edge. The proximal front edge of the groove is produced by impact extrusion.

Abstract: A multiple channel selector valve includes a stator and a rotor that is rotatable with respect to the stator. The rotor face includes first and second fluid flow paths for transferring fluids to selected sets of passages in the stator. The fluid flow paths in the rotor face are specifically configured to accommodate high fluid flow rate regimes while reducing flow restriction.

Abstract: A valve comprising housing body, partition plate, and collecting device. The housing body defines a housing cavity. The partition plate is provided in the housing cavity. A leakage passage extends along the partition plate through the housing body. The collecting device comprises a lower piece, an upper piece, and a connector connecting them. The upper piece and the lower piece cover a leakage passage upper port and a leakage passage lower port, respectively. The lower piece comprises a collecting cavity communicating with the leakage passage lower port. The lower piece and lower part of the housing body are provided with lower fitting assembly. The upper piece and upper part of the housing body are provided with an upper fitting assembly. The lower piece and the upper piece are fitted on the housing body in place by means of the lower fitting assembly, the upper fitting assembly and the connector.

Abstract: A valve body element having a central bore. The valve body element includes first and second structures that are each formed of a compacted powdered metal material. The first structure has a plurality of L-shaped first passage portions that extend radially outwardly from a first portion of the central bore and intersect an axial end of the first structure. The second structure defines a remaining portion of the central bore and includes a flange. The flange defines a joining section, into which the axial end of the first structure is received, and a plurality of second passage portion. Each of the second passage portions is coupled in fluid communication to a corresponding one of the first passage portions. The remaining portion of the central bore in the second structure is in fluid communication with the first bore portion of the central bore in the first structure.

Abstract: A cryocooler includes a displacer capable of reciprocating in an axial direction, a cylinder that accommodates the displacer, a drive piston that drives the displacer in the axial direction, a drive chamber that accommodates the drive piston, a rotary valve that includes a first valve element that is one of a valve rotor rotatable around a rotary valve rotation axis and a valve stator, and a second valve element that is the other of the valve rotor and the valve stator, a reversible motor that is coupled with the rotary valve so as to rotate the rotary valve around the rotary valve rotation axis. The rotary valve includes a coupling mechanism that couples the first component and the second component with each other. The first relative angle is designed to cool the cryocooler, and the second relative angle is designed to heat the cryocooler.

Abstract: A cooling-water control valve device includes a valve member, a housing for accommodating the valve member, a pipe unit, a valve seat member, a spring and so on. The pipe unit has, at its axial end on a side facing to the valve member, an outside cylindrical portion and an inside cylindrical portion, which is coaxially arranged with the outside cylindrical portion at a radial-inside position of the outside cylindrical portion. An annular accommodation space is formed between the inside cylindrical portion and the outside cylindrical portion. The spring and the valve seat member are arranged in the annular accommodation space.

Abstract: A liquid medicine injection apparatus of the present invention is directed to improvement of a precise and detailed technology that can implement two functions of a high liquid medicine injection pressure and easy filling of the apparatus with a liquid medicine in a single apparatus without a separate additional unit, i.e., a technology for effectively adjusting an internal pressure of the apparatus depending on a liquid medicine filling mode and a liquid medicine injection mode. In the liquid medicine injection apparatus of the present invention, when an internal pressure of the apparatus exceeds a preset pressure due to a gas generated in a gas-generating unit of the apparatus, a switch member in the liquid medicine injection apparatus can operate as a pressure regulating valve, thereby constantly keeping the internal pressure of the apparatus at the preset pressure.

Abstract: A rotary valve system includes a first body having a first plurality of fluid channels. The first fluid channels have a common first inlet to receive a fluid and a first outlet. The system includes a second body coupled to the first body. The second body has a second plurality of fluid channels. The second fluid channels have a second inlet and a second outlet. The system includes a plate assembly having a plate coupled between the first body and the second body. The plate is movable between at least a first, open position in which the first outlet of at least one of the first fluid channels is in fluid communication with the second inlet of at least one of the second fluid channels and a second, closed position in which the second inlet of each of the second fluid channels is substantially completely obstructed by the plate.

Abstract: A sliding metal seal valve comprises one or more non-circular (oblate) metal seals. Use of non-circular (oblate) sliding metal seals, permits the rotor of a rotary sliding metal seal valve to have a smaller diameter which permits a smaller overall valve size. Reduced rotor diameter also reduces the torque required to turn the rotor, permitting smaller actuator motors to be used. Axially sliding valves such as bar valves may also employ such non-circular sliding metal seals to permit a reduction in the width of such valve.

Abstract: A multiway valve for controlling a refrigerant circuit (12) of an air conditioning system with heat pump function has a housing (14), first inlet opening (21) connected by a first fluid channel (22) to a regulating chamber (19), a second connection opening (22) connected by a second fluid channel (26) to the regulating chamber (19), another connection opening (29, 33) connected by another fluid channel (30, 34) to the regulating chamber (19), an actuator (37) that actuates a transmission element (39) by a drive motor (38), which extends in the housing (14) between the drive motor (38) and the regulating chamber (19), and a rotary valve assembly (55) in the regulating chamber (19) and coupled to the transmission element (39) to be driven by a rotary motion, into consecutive and divergent switching or control positions between the inlet opening (21) and the connection openings (25, 29, 33).

Abstract: The invention relates to a connecting valve (10), comprising at least four connections (101-104) for fluid circulation tubes, which comprises a single control member (120) designed to allow the selective creation of several configurations of communication pathways within the valve, between certain tube connections; these configurations notably include: • a first configuration in which a first tube connection, referred to as “main inlet” (103) is placed in communication with only a second tube connection, referred to as “main outlet” (104), • a second configuration in which the main inlet is placed in communication with a third tube connection (101), referred to as “bypass outlet”, and a fourth tube connection (102) referred to as “bypass return” is placed in communication with the main outlet, and • a third configuration in which the main inlet is placed in communication both with the main outlet and with the bypass outlet, and the bypass return is placed in communication with the main outlet.

Abstract: A positive displacement pump includes two fluid flow paths, two center sections with a common fluid valve, a changeover valve, and three fluid displacement members. Each center section contains a diaphragm shaft, and the two sections are separated by the third diaphragm. In low-pressure mode the pump operates as a typical positive displacement pump with pumping fluid supplied to one center section and the changeover valve allowing the fluid to freely circulate within the second center section. In high-pressure mode, the changeover valve is switched and the changeover valve allows the common fluid valve to supply pumping fluid to both center sections to drive the fluid displacement members therein, which generates a higher outlet fluid pressure.

Abstract: A valve includes a valve body having a groove and a fluid guiding element, wherein the fluid guiding element defines at least three channels and a cavity for receiving the valve body therewithin, so as to enable the communication among the channels to be adjusted by rotating the valve body.

Abstract: Provided are: a flow path switching valve that reduces the pressure load in a contact surface outer peripheral section of the flow path switching valve and inhibits friction between constituent components; and a liquid chromatographic device using the flow path switching valve. The flow path switching valve is provided with a stator having a plurality of through holes and a seal having conduction grooves for causing the through holes to conduct. The seal has a first portion present vertically beneath a region comprising at least a surface of contact with the stator, and a second portion having lower rigidity than the first portion, on the outside of the first portion. Due to this configuration, it is possible to reduce the pressure load when a flow path of a liquid is switched under high-pressure conditions, and inhibit the phenomenon of friction itself.

Abstract: An inflatable assembly may include a housing that has a plurality of adjustment inflatables that may form a range of shapes at different levels of inflation. The inflatable may also include one or more sensors disposed on the housing and one or more valves disposed in the housing. The valves are controllable and configured to direct fluid flow into the plurality of adjustment inflatables. The assembly may also include a processor that receives data from the one or more sensors disposed on the housing and adjust one or more positions of the one or more valves based on the data to control fluid flow into one or more of the plurality of adjustment inflatables.

Abstract: An anti-jackknife steering system for an articulated bus is provided. A hydraulic turntable is used for actively generating a calculated force to balance the inertia of a front frame and a trailer frame. Consequently, the joint angle is adjusted to an optimal range, and the possibility of causing an oversteering event or a jackknife event is largely reduced. Moreover, a wheel brake device cooperates with the hydraulic turntable to assist in the steering action of the articulated bus on a snowy road. Consequently, while the articulated bus is driven on a slippery road, the possibility of causing collision is minimized.

Abstract: A water monitoring device monitors and maintains swimming pool chemistry. The device includes sensors that detect water chemistry. The water monitoring device can communicate with computers and servers. This system can be used to determine if corrections to the water chemistry are required to maintain water sanitation. The device can monitor: pH, air temperature, water temperature, free chlorine levels, oxidation reduction potential, alkalinity, oxygen demand, water movement and velocity, and electrical conductivity.

Abstract: A switching valve is described that has a stator which is arranged in a housing and which has multiple connection ports. The switching valve also has a rotatable rotor which is arranged in the housing and which, in predetermined switching positions defined by associated angular positions, interacts with the stator for the fluidic connection or separation of predetermined connection ports. The rotor is rotatably mounted, and acted on with a predefined pressing force in the direction of the stator, by means of a bearing and pressing device arranged in the housing. The bearing and pressing device has a spring device which exerts a load on the rotor or on an element that is capable of performing a wobbling movement.

Abstract: A shear valve, for use in a high performance liquid chromatography system, comprises a first shear valve member and a second shear valve member. At least one of the first and second shear valve members is adapted to be moved with respect to the other. One of the first and second shear valve members comprises a plurality of ports, and the other comprises at least one fluid path for fluidly coupling respective ones of the ports in dependency on a relative movement position of the first and second shear valve members with respect to each other. The first shear valve member is at least partially coated with or comprised of silicon carbide.

Abstract: A high torque active mechanism for an orthotic and/or prosthetic joint using a primary brake which can be provide by magnetorheological (MR) rotational damper incorporating and an additional friction brake mechanism driven by the braking force generated by the MR damper. This combination of MR damper and friction brake mechanism allows an increase in torque density while keeping the same level of motion control offered by the MR damper alone. The increased torque density achieved by this high torque active mechanism allows to minimize the size of the actuating system, i.e. its diameter and/or breath, while maximizing its braking torque capability. In this regard, the friction brake mechanism is advantageously positioned around the MR damper, such that the dimension of the package is minimized.

Abstract: A rotary valve adapted for use in utility scale fluidic systems improves over conventional valving schemes by affording reductions in weight, pressure drop, cost, and actuation time, as well as providing improvements in decompression performance, higher pressure capability, and longer operational life. One embodiment of a three way valve assembly utilizes electric actuation to adjust decompression in real time and facilitate port shaping. The valve assembly utilizes a pressure balanced rotor and seals to reduce actuation and bearing loads, as well as increase seal life.

Abstract: A rotary valve includes a valve cap, a valve body, a rotary valve disk, and an actuator. The valve body includes first and second sets of fluid flow passages, with each set having a drain, a fluid inlet, a fluid outlet and a fourth passage connected to the fluid outlet passage. The rotary disk includes first and second connecting passages. The actuator and rotary disk have first and second positions in which various passages of each set of fluid flow passages aligned with and connected by the connecting passages and a third position in which the fluid outlet passage of each set of fluid flow passages is connected to the drain passage of the other set of fluid flow passages.

Abstract: A pilot-controlled valve having a valve system switches a pressure medium flow between at least one working connection, a supply pressure connection and a ventilation connection, and includes at least one valve member of ceramic material operated rotationally/linearly by pilot control, at least one connecting channel is bringable into flow connection to the working connection, which, based on the valve member's position, produces a flow connection of the working connection to a first flow channel connected to the ventilation connection or to a second flow channel that is connected to the supply pressure connection, at least one section of the first and second flow channels being in at least one static valve body of ceramic material, at least the first flow channel is sealed from the second flow channel by at least one seal that is in a region outside a direct inflow by the pressure medium.

Abstract: A leveling valve for discharging and supplying air from and to a plurality of utilization elements comprises a valve disc arrangement configured to direct air between a source of pressurized air, an exhaust port, and the utilization elements. The valve disc arrangement comprises a first and a second valve disc, which are rotatable with respect to each other such that the valve is switchable between multiple switching positions, and, in some switching positions, either the source of pressurized air or the exhaust port are in fluid communication with the utilization elements. The valve discs provide a stepped increase in flow cross-section in a respective flow path to or from the utilization elements. The stepped increase is dependent on the angle of rotation between the valve discs.

Abstract: A flow channel switching valve is provided including a stator and a rotor inside a housing, in which the rotor is rotated by a rotor drive portion while sliding on the stator. A rotor drive shaft holding the rotor is biased to a housing top side by an elastic member. A drive shaft stopper is provided that limits movement when the rotor drive shaft moves to the housing top side from a normal position when a housing top is attached to a housing body.

Abstract: A shear valve for use in a high performance liquid chromatography system. The shear valve includes a first valve member having a plurality of first fluid-conveying features, and a second valve member having one or more second fluid-conveying features. The second valve member is movable, relative to the first valve member, between a plurality of discrete positions such that, in each of the discrete positions, at least one of the one or more second fluid-conveying features overlaps with multiple ones of the first fluid conveying features to provide for fluid communication therebetween. At least one of the first and second valve members is at least partially coated with a protective coating that includes an adhesion interlayer and a diamond-like carbon (DLC) layer. The DLC layer is deposited on the adhesion interlayer via filtered cathodic vacuum arc (FCVA) deposition.

Abstract: Exchanger devices include a plurality of fixed exchange ducts and a rotating valve assembly for directing flow to and from the plurality of exchange ducts. Methods of exchanging pressure between fluid streams may include directing fluids through an exchange device and pressurizing a fluid in the plurality of exchange ducts of the exchanger device.

Abstract: A downhole hydraulic control tool comprising a substantially tubular body adapted for connection in a tubing string, the body including a throughbore arranged coaxially with a bore of the tubing string and one or more pockets arranged on a wall of the body, the pockets including a hydraulic power source and at least two control lines, wherein the device includes a pump to drive the hydraulic fluid through the control lines and a switchable flow mechanism for switching the flow of pumped fluid between the at least two control lines, and a switchable flow mechanism and a method of operating one or more downhole devices from a downhole located hydraulic control tool.

Abstract: A pneumatic control valve device for systems for arbitrarily lifting and lowering the vehicle body of air-suspended vehicles, with a control device having at least one mechanical control element for the positions lift, lower, drive and stop, and with a spring device for returning the control element after it has been released, in which the spring device returns the control element after it has been released into the drive position, a position securing device is provided, the position securing device mechanically locking the control element, the position securing device, in the locked state, preventing the control element from returning under the spring force of the spring device into the drive position, but permitting this in the unlocked state, however always permitting the control element to be manually adjusted, the position securing device can be changed from the locked state into the unlocked state by an electric signal.

Abstract: A pilot regulator system includes a housing having a fluid inflow port, a ball valve to regulate fluid flow among two fluid outflow ports, two regulator outputs each associated with one of said two fluid outflow ports, and a regulator selection aperture. An extension portion, generally horizontal to the regulator outputs, is connected to the regulator selection aperture, and includes an open end for access to a selection member that can be moved between two positions to select fluid flow to one of two regulator outputs. The extension portion also has a groove and the selection member has an extension extending through the groove so as to be movable by either the extension or the selection member itself. The extension portion has an expansive cross-sectional element to guide a remote vehicle to the selection member for movement thereof.

Abstract: A multi-port rotary disc valve adapted to allow fluid flow from at least one fluid source to a plurality of destinations, comprises a stator with fluid flow ports including a plurality of individual ports and at least one common port. Each of the individual ports is adapted for fluid communication with at least one of the destinations, and the one common port is adapted for fluid communication with the source. The individual ports are arranged in spaced apart relationship within an individual ports' stator sector having a stator sector angular length. The valve further comprises a rotor having at least a first, a second and a third rotor sector with channels arranged therein, being opened to the atmosphere or adapted to connect the fluid flow ports of the stator between them in a plurality of predetermined combinations.

Abstract: The present invention relates to a leveling valve including a first port, a second port, a third port, a valve, and a clutch. The clutch is provided with an engaged position and a disengaged position. At least a portion of the clutch may move relative to the valve when the clutch is in the disengaged position. The clutch moves the valve when the clutch is in the engaged position. The valve is movable between a first position, a second position, and a third position. When the valve is in the first position, the valve blocks a first pathway, which extends from the first port, from connecting with a second pathway, which extends from the second port. When the valve is in the second position, the valve allows the first pathway to connect with the second pathway. When the valve is in the third position, the valve allows the second pathway to connect with a third pathway, which extends from the third port.

Abstract: A multi-stage height control valve for a pneumatic control system of a vehicle includes an air reservoir port, an exhaust port, an air spring port and a pilot port operatively connected to a rotor valve which is in turn operatively connected to the vehicle. The air reservoir port fluidly communicates with an air tank. The air spring port fluidly communicates with the air springs of the vehicle. The exhaust port opens to atmosphere. The pilot port fluidly communicates with a control/warning device such that, when a secondary ride height is reached by the vehicle, the pilot port signals the control/warning device in order to maintain the vehicle at the secondary ride height. The pilot port alternatively provides an air pressure boost in order to quickly re-inflate the air springs of the vehicle to return the vehicle to the primary design ride height.

Abstract: A rotary compressor has two compression capacities according to two different rotational directions of the driving shaft. The rotary compressor includes a driving shaft with an eccentric portion. A roller rotates on the shaft along an inner circumference of the cylinder. A vane installed in the cylinder continuously contacts the roller. An upper and a lower bearing are respectively disposed on the top and bottom of the cylinder. A disc shaped valve rotates between two positions and has at least one suction port for selectively supplying refrigerant inside the compression chamber according to the rotational direction of the driving shaft and at least one discharge port communicates with the compression chamber for discharging the compressed refrigerant. The refrigerant is supplied through a communication hole to a port formed on the outer valve.

Abstract: A rotary control valve and associated actuator control system. An actuator control system comprises a rotary control valve including a generally planar face seal, and an actuator operatively connected to the rotary control valve. Another actuator control system comprises a control valve including multiple faces having multiple ports formed therein. Fluid communication is selectively permitted and prevented between the ports in response to relative displacement between the faces. A differential area is configured to apply a biasing force which maintains sealing engagement between the faces, and which increases in response to an increase in pressure applied to the control valve.

Abstract: A rotary valve for controlling air supply in an inflatable device comprises a first rotor (11) and the second rotor (12) driven by motor (13) with a drive pulley (14) fixed directly onto its drive spindle (15). A toothed belt (16) driven by the drive pulley (14) engages with the toothed perimeter profile of the first rotor (11), to rotate rotors (11) and (12) relative to a stator (10). As the first and/or second rotor(s) are rotated, channels and ports on the airtight interfaces between the rotors (11, 12) and the stator (10) are connected and disconnected as required by the desired inflation sequence, including all the ports sealed in one position or all the ports exhausting to atmosphere in another position. The valve can be used in conjunction with any type of inflating device, where complex porting or air routing is required, the valve achieving this in a simpler manner.

Abstract: A rotary compressor for changing a compression capacity of the compressor includes a driving shaft being rotatable clockwise and counterclockwise, and having an eccentric portion of a predetermined size; a cylinder forming a predetermined inner volume; a roller installed rotatably on an outer circumference of the eccentric portion so as to contact an inner circumference of the cylinder; a vane installed elastically in the cylinder to contact the roller continuously; a first bearing installed in the cylinder, for rotatably supporting the driving shaft; a second bearing installed in the cylinder, for rotatably supporting the driving shaft and guiding the fluid into the fluid chamber; discharge ports communicating with the fluid chamber; and a valve assembly having openings separated by a predetermined angle from each other, the valve assembly having a center which is eccentrically installed by a predetermined distance from a center of the cylinder.

Abstract: There is provided a buffered rotary valve in which a valve is additionally installed in a rotary valve for supplying a fluid of high pressure and a fluid of low pressure being input from a compressor, thereby reducing the amount of fluid being supplied and unnecessarily consumed, and enhancing the efficiency of a freezing system.

Abstract: An improved electro-hydraulic intake and exhaust valve actuator for a “camless” internal combustion reciprocating engine. The present invention integrates an electric motor driven “plug type” rotary control valve and a single acting hydraulic cylinder in one housing for the actuation of an engine valve. The geometry of the hydraulic ports in the rotary control valve may be tailored for desired valve actuation profiles. The electronic control of the rate of rotation and angular position of the rotary control valve are used to infinitely vary the engine valve operating parameters. Thus, engine valve timing, speed, cycle duration and lift may be varied. A rotary control valve permits high speed operation and accommodates a broad range of valve sizes. Availability of a wide range of commercial open frame brushless electric motors and dedicated integrated circuit controllers contribute to the cost effectiveness of the present design.