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| Number | Title | Issue Date |
| 7237472 | Linear hydraulic stepping actuator with fast close capabilities The invention provides a choke system with hydraulic circuits which provide choke valve positioning that can be varied by the use of incremental steps. The incremental movement action in either the opening or closing direction is accomplished through the use of one ... | 07/03/2007 |
| 6327956 | Hydraulic control with improved regenerative valve apparatus and method An improved method and apparatus utilizing regenerative hydraulic control principles are disclosed. A regenerative valve is operatively connected in a hydraulic control circuit with a primary hydraulic cylinder for controlling the speed at which the pisto... | 12/11/2001 |
| 6024541 | Hydraulic axial piston pumps A hydraulic axial pump/motor comprises a plurality of revolving as well as reciprocating pistons, operatively associated with a stationary port plate. The port plate comprises at least a first, elongated, arcuate suction port and at least a second elongat... | 02/15/2000 |
| 5784943 | Arrangement in a hydraulic cylinder A hydraulic actuator includes three cylinder spaces: a first cylinder space (6) located between a ring piston and a cylinder; a second cylinder space (7) between the ring piston and an auxiliary piston inside a hollow piston rod connected to the ring pist... | 07/28/1998 |
| 5692427 | Flow reinforcement directional control valve for a hydraulic circuit A flow reinforcement directional control valve that is capable of reinforcing a pressure fluid to two actuators, can be formed as compact and yet is capable of flowing a return fluid out of a single actuator into a tank is provided, wherein a valve block ... | 12/02/1997 |
| 5673605 | Motor cavitation prevention device for hydraulic systems A motor cavitation prevention device for hydraulic systems is disclosed. The device exerts no influence upon return fluid of any actuators other than the hydraulic motor thereby preventing undesired pressure loss of the return line. The device has valve m... | 10/07/1997 |
| 5634776 | Low noise hydraulic pump with check valve timing device A low noise hydraulic pump is disclosed which can be an piston pump or a vane pump, including a flow generation assembly with at least one pumping chamber for creating positive displacement of hydraulic fluid into a hydraulic system. The pump also include... | 06/03/1997 |
| 5148676 | Confluence valve circuit of a hydraulic excavator A service valve circuit of a hydraulic excavator connected beforehand for use in controlling a special attachment in addition to a prescribed actuator control valve. The service valve circuit comprises a confluence valve 17 for performing electromagnetic ... | 09/22/1992 |
| 5131227 | Priority arrangement and method for a fluid handling system A prioritizing method and arrangement for a hydraulic system including two independent hydraulic fluid supply units (4, 5) adapted to jointly and severally supply hydraulic fluid to at least two hydraulic components (2, 3). A cross-communication between t... | 07/21/1992 |
| 5024140 | Hydraulic control mechanism for a hydraulic actuator The invention is directed to a hydraulic control mechanism for a work vehicle. The work vehicle is provided with a work implement that is operated by a hydraulic actuator. The positioning of the work actuator is controlled by a pilot control system that s... | 06/18/1991 |
| 4989495 | Hydraulic positioning system with normal and high supply and exhaust flow paths The hydraulic piston cylinder assembly which operates the governor of a turbine which powers a hydropower generator has a servo valve capable of flowing only a portion of its flow requirements during normal low power fluctuation conditions of the turbine'... | 02/05/1991 |
| 4986072 | Hydraulic actuator circuit with flow-joining control A hydraulic actuator control circuit capable of increasing the flow rate of the working fluid supplied to hydraulic actuators when the load on the hydraulic actuators increases beyond predetermined values includes a first valve group having a plurality of... | 01/22/1991 |
| 4813339 | Pulse-width-modulation control of parallel three-way valves to supply single-acting quick-response actuator Parallel, pulse-width-modulation controlled three-way valves each both supply and exhaust a pressure chamber of a fluid actuator. The phase difference of the oscillator carrier waves of the pulse width modulation input circuit effectively increases the fr... | 03/21/1989 |
| 4656833 | Hydraulic brake system for automotive vehicles A hydraulic brake system for automotive vehicles with a master brake cylinder (51) and with a hydraulic power booster (49) connected upstream of the master brake cylinder, in which a pressure medium pump (18) which may be driven by an electric motor (17) ... | 04/14/1987 |
| 4559965 | Multiple compensating unloading valve circuit A multiple compensating unloading valve circuit including multiple fixed displacement pumps and corresponding compensator unloading valves which are phased so that one pump supplies the fluid demand for the circuit until the demand exceeds that pump's cap... | 12/24/1985 |
| 4559648 | Safety control valve for an artificial heart A safety drive for an artificial heart, if the right drive should fail it is simply put out of operation, while if the left drive fails, the right drive, which is still functioning, is switched over to the left circulatory pump and thus serves as a system... | 12/24/1985 |
| 4478318 | Vehicle brake system An improved brake control apparatus for a brake system having redundant brake application fluid circuits 30, 32 and a brake retraction fluid circuit 62. A valve assembly 34, including a slidable two position valve element 60 communicates one brake applica... | 10/23/1984 |
| 4473090 | Hydraulic power system for implement actuators in an off-highway self-propelled work machine All but the circle drive motor of the implement actuators of a motor grader are divided into two groups each consisting of those which need not be operated simultaneously. The power system has three fixed displacement pumps for driving the circle drive mo... | 09/25/1984 |
| 4461148 | Hydrostatic drive systems A hydrostatic drive system consisting of at least two component systems is provided, each component consisting of an adjustable pump, where the loading of the pump adjusting cylinder is regulated by a hydraulically controlled servo control valve, one side... | 07/24/1984 |
| 4453450 | Fluid motor A fluid motor (10) having a housing (12) with first (14), second (16) and third (18) chambers therein. A first partition (22) separates the first chamber (14) from the second chamber (16). A second partition (24) separates the second chamber (16) from the... | 06/12/1984 |
| 4453451 | Hydraulic steering system with automatic emergency pump flow control A vehicle hydraulic system wherein there is provided a primary pump coupled to a steering control valve through which steering of the vehicle is effected. A main priority valve is used to meter the flow of pressurized hydraulic fluid from the primary pump... | 06/12/1984 |
| 4406212 | Hydraulic apparatus Hydraulic apparatus (7), for use where a hydraulic actuator (42) is powered by a first hydraulic supply (40) or selectively and alternatively by a second hydraulic supply (41) independent of the first, which, when a fault occurs, will establish whether th... | 09/27/1983 |
| 4401009 | Closed center programmed valve system with load sense A closed center programmed valve system having a load sense fluid source for control of the raising and lowering of load means by a raise and a lower normally closed two stage valve assembly. Each of the second stages of the valve assemblies has a poppet ... | 08/30/1983 |
| 4338855 | Relief valve mechanism for a hydraulic booster A relief valve mechanism for a hydraulic booster provides in an open position a by-pass passage leading to a power steering and relieves excess pressure on the upstream side of the hydraulic booster. The relief valve in the open position forms a second th... | 07/13/1982 |
| 4326558 | Steering system including accumulator for supplying emergency reserve of fluid A hydraulic fluid power system includes an accumulator which stores a reserve of pressure fluid at pump standby pressure. The charging and discharging of the accumulator is controlled by an emergency steering valve which is operable in response to a prede... | 04/27/1982 |
| 4303089 | Steering including accumulator for supplying emergency reserve of fluid A hydraulic fluid power steering system includes an accumulator which stores a reserve of pressure fluid at pump standby pressure. The charging and discharging of the accumulator is controlled by an emergency steering valve which is operable in response t... | 12/01/1981 |
| 4242867 | Standby supply system for delivering pressure fluid to a user component The standby supply for delivering pressure fluid to a user component includes a fluid pump as a primary fluid source coupled to the user component by a first check valve, an accumulator as a secondary fluid source coupled to the pump by a second check val... | 01/06/1981 |
| 4226166 | Control unit for the supply of a work unit fed in parallel from a hydraulic station common to other units Hydraulic control. The unit is characterized in that it is provided, between an inlet well and an outlet well for pressurized fluid, with an obturator urged in the closed position by a resilient member arranged to act against the pressurized fluid in the ... | 10/07/1980 |
| 4168867 | Vehicle anti-skid brake control device An anti-skid brake control device includes a servo mechanism for controlling pressure reducing operation of the device. The servo mechanism includes a constant pressure chamber connected to an engine intake manifold, a variable pressure chamber alternatel... | 09/25/1979 |
| 4161867 | Hydraulic brake booster A hydraulic brake booster mechanism for use with an open or circulating fluid pressure system includes a divider valve for the fluid flow interposed between a source of continuously circulating fluid pressure and a power steering mechanism, a control valv... | 07/24/1979 |
| 4073543 | Switching device for the indirect alteration of the mechanical brake pedal transmission A shifting apparatus for the indirect changing of the mechanical brake pedal transmission ratio in case of failure of the servo-assist of a motor vehicle brake force booster system, in which the shifting apparatus can be installed at any suitable place of... | 02/14/1978 |
| 4054151 | Concentrating vortex shaker A concentrating vortex shaker for the simultaneous shaking and concentration of a multiplicity of liquid samples comprises a heat-conductive block having a plurality of openings for receiving laboratory vessels containing sample liquids and removably moun... | 10/18/1977 |
| 4034566 | Hydraulic boosting apparatus in braking system A hydraulic boosting apparatus in a braking system, which apparatus has an accumulator which provides an oil pressure accumulated in a high pressure circuit, the oil pressure being supplementarily used in addition to an oil pressure from the usual hydraul... | 07/12/1977 |
| 4007593 | Motor vehicle open center series hydraulic circuit A motor vehicle fluid power circuit is disclosed which includes a primary pump, a closed center brake booster, and an open center steering valve. These components are hydraulically connected in series with the fluid flowing from the pump to the closed cen... | 02/15/1977 |
| 3995529 | Reserve system activation and modulation for hydraulic feedback brake boosters A hydraulic brake booster is disclosed which is normally actuated by a primary pressure source, but which may be actuated by a secondary pressure source during failure of the primary pressure source. The booster includes a spool valve which controls commu... | 12/07/1976 |
