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| Number | Title | Issue Date |
| 8091355 | Flow compensated restrictive orifice for overrunning load protection A hydraulic circuit for an actuator that has a piston and piston rod that will move a load in a first direction, and which can be externally loaded in an opposite direction, includes a flow compensated valve between the actuator and a control valve. When the piston ... | 01/10/2012 |
| 7827787 | Hydraulic system A ground engaging vehicle including a movable member, a hydraulically driven actuator, a hydraulic pump, a plurality of valves and at least one hydraulic conduit. The hydraulically driven actuator is coupled to the movable member and the actuator has a first chamber... | 11/09/2010 |
| 7353744 | Hydraulic control The invention concerns a hydraulic control (1) with a supply connection arrangement (7) having a high-pressure connection (P) and a low-pressure connection (T), a working connection arrangement having two working connections (A, B) connectable with a c... | 04/08/2008 |
| 7308882 | Oil feeding system of engine An oil feeding system of an engine equipped with a transmission configured to change a rotational speed of rotation of a crankshaft and to output the rotation, including an oil pump configured to be driven in cooperation with the rotation of the crankshaft, an oil p... | 12/18/2007 |
| 7272531 | Aggregation of asset use indices within a process plant A method of monitoring an entity within a process plant wherein the entity includes a plurality of lower level entities, includes acquiring a plurality of use indices, acquiring a plurality of weighting values, and creating an aggregate use index from a combination ... | 09/18/2007 |
| 7251935 | Independent metering valve control system and method A hydraulic control system has an actuator with first and second chambers, first and second valves having elements movable to fill and drain the first and second chambers, and at least one sensor configured to generate a load signal indicative of a load on the fluid... | 08/07/2007 |
| 7219591 | Hydraulic control arrangement What is disclosed is a hydraulic control arrangement for controlling a hydraulic consumer, comprising an adjustable supply measuring orifice and an adjustable drain measuring orifice as well as a pressure compensator arranged in a pressure medium delivery. The contr... | 05/22/2007 |
| 7221988 | Creation and display of indices within a process plant A process control system uses an asset utilization expert to collect data or information pertaining to the assets of a process plant from various sources or functional areas of the plant including, for example, the process control functional areas, the maintenance f... | 05/22/2007 |
| 7210292 | Hydraulic system having variable back pressure control A hydraulic system for a work machine having a linkage system is disclosed. The hydraulic system has a tank configured to hold a supply of fluid and at least one hydraulic actuator associated with the linkage system to affect movement of the linkage system. The at l... | 05/01/2007 |
| 7204084 | Hydraulic system having a pressure compensator A hydraulic system for a work machine is disclosed. The hydraulic system has a source of pressurized fluid and a fluid actuator with a first chamber and a second chamber. The hydraulic system also has a first valve configured to selectively fluidly communicate the s... | 04/17/2007 |
| 7206646 | Method and apparatus for performing a function in a plant using process performance monitoring with process equipment monitoring and control A process control system uses a data collection and distribution system and an asset utilization suite to collect data or information pertaining to the assets of a process plant from various sources or functional areas of the plant including, for example, the proces... | 04/17/2007 |
| 7165486 | Apparatus and method for hydraulically controlling a vehicle restraint A valve circuit, including a first and second circuit portion, for hydraulically controlling a loading dock vehicle restraint. The first circuit portion permits raising and lowering of the vehicle restraint. The second circuit portion permits extension and retractio... | 01/23/2007 |
| 7146808 | Hydraulic system having priority based flow control A hydraulic system has a source, a plurality of fluid actuators, and a controller. The controller is configured to receive an input indicative of which of the plurality of fluid actuators are a first and a second type of fluid actuator, to receive an input indicativ... | 12/12/2006 |
| 7134380 | Valve arrangement and hydraulic drive The invention concerns a valve arrangement for controlling a hydraulic drive, the supply and the outflow of the hydraulic drive being separately controllable. It is endeavoured to improve the valve arrangement in such a manner that it is intrinsically tight, at the ... | 11/14/2006 |
| 7104054 | Hydraulic cylinder cushioning A system for damping the extension and retraction of a hydraulic cylinder of a work vehicle at the ends of the cylinder's stroke. ... | 09/12/2006 |
| 7043906 | Hydraulic equipment A hydraulic apparatus realizes the same function as that of a variable discharge pump by regulating a hydraulic device such as a control valve in a state always operated at a substantially constant number of revolutions with a high efficiency regardless of the type ... | 05/16/2006 |
| 7036310 | Hydraulic controller for hydraulic actuator A hydraulic controller for a hydraulic actuator (6) incorporated in a power transmission mechanism, wherein an accumulator (16) is connected to an oil supply passage (14) for the hydraulic actuator (6) for supplying oil from a pump (10... | 05/02/2006 |
| 7010911 | Fluid pressure control circuit A fluid pressure control circuit includes a fluid pressure device which is operated by a fluid pressure; a control valve which is connected to the fluid pressure device via a connecting passage, and which changes a flow rate of predetermined fluid that is to be supp... | 03/14/2006 |
| 6994648 | Fluid pressure control circuit A pair of feedback chambers is provided in a supply/discharge switching control valve, and the hydraulic pressure is introduced from a portion on the upstream side of the orifice provided in the communication passage through the second feedback passage, and is intro... | 02/07/2006 |
| 6789387 | System for recovering energy in hydraulic circuit A method is provided for recovering energy in a hydraulic circuit. The hydraulic circuit includes a pump having a swashplate and being in fluid communication with a hydraulic actuator via a valve. The method includes sensing an overrunning load condition in the hydr... | 09/14/2004 |
| 6761029 | Swing control algorithm for hydraulic circuit A fluid control system may comprise a pump, a tank, and an actuator including a working chamber. The system may be operative to control rotational movement of a swing structure and movement of an least one implement. A valve assembly may be configured to control flu... | 07/13/2004 |
| 6745564 | Hydraulic variable control apparatus for heavy construction equipment A seat valve body mounted in a hydraulic line between a pump line and feeder lines to control hydraulic fluid supplied to variable throttles and to auxiliarily control hydraulic fluid flowing in a load line comprises a first seat valve having a variable control thro... | 06/08/2004 |
| 6732512 | Velocity based electronic control system for operating hydraulic equipment A control system for operating a hydraulic system includes a user input device which generates an input signal indicating desired movement of a hydraulic actuator. A mapping routine converts the input signal into a velocity command indicating desired actuator veloci... | 05/11/2004 |
| 6662705 | Electro-hydraulic valve control system and method A system and method for controlling an electro-hydraulic valve arrangement to perform a pump check function are provided. The system includes an electro-hydraulic valve arrangement disposed between a source of pressurized fluid and a hydraulic actuator. P... | 12/16/2003 |
| 6609369 | System and method of pressure compensation for electro hydraulic control systems A pressure compensator for use in a control system for an electro hydraulic-implemented work element being operated through the use of operator input control mechanisms generating operator input signals upon the application thereof, the control system inc... | 08/26/2003 |
| 6499295 | Hydro-transformer The present invention relates to a hydro-transformer including a hydraulic machine, a switching valve and a control means. A work port of the switching valve, which may optionally be connected hydraulically with a pressure port of the switching valve or a... | 12/31/2002 |
| 6347517 | Hydraulic circuit with a self-calibrating device for agricultural or earthmoving machinery A hydraulic circuit with one or more electrically operated hydraulic distributors is provided for an agricultural or earthmoving machine. A pump unit supplies pressurized fluid to the hydraulic distributors which, in turn, supply the pressurized fluid, on... | 02/19/2002 |
| 6119802 | Hydraulic drive system for a vehicle A hydraulic drive system for a vehicle includes a pressurizing circuit and a working circuit. The pressurizing circuit incorporates a pump driven by a prime mover having a nominal horsepower rating. The prime mover is either shut off or idled when the pre... | 09/19/2000 |
| 6095029 | Method for supplying a device or system with an alternating, pulsating, or cyclic flow of power or energy The invention relates to a method for supplying a device or system with a pulsating or cyclic flow of power or energy that alternates in the manner of a noise, with the noise having a spectral amplitude or intensity distribution that is essentially the in... | 08/01/2000 |
| 5943860 | Pressure loss compensation device of a fluid pressure circuit and cam arrangement incorporating the same A pressure loss compensation device for a fluid pressure circuit automatically compensates a pressure loss of a working fluid pressure as required or regularly, in the fluid pressure circuit. A cylinder device forming the pressure loss compensation device... | 08/31/1999 |
| 5848531 | Hydraulic drive system for construction machines A hydraulic system for a construction machine includes a hydraulic pump driven by a prime mover, actuators driven by a hydraulic fluid delivered from the hydraulic pump, flow control valves for controlling flow of the hydraulic fluid to the actuators and ... | 12/15/1998 |
| 5839279 | Hydraulic actuator operation controller A hydraulic actuator operation controller is shown to make it possible to easily change the operation speeds of a hydraulic actuator for a control input of an operating instrument. A signal input from a control input detection device for detecting the con... | 11/24/1998 |
| 5727387 | Apparatus for controlling an implement of a work machine An apparatus for controllably moving an implement is provided. The implement is connected to a work machine and is movable between first and second implement positions in response to operation of a hydraulic actuator. The apparatus includes a joystick wit... | 03/17/1998 |
| 5634773 | Superhigh pressure control system First and second boosters 1, 2 which, through reciprocating motions of oil hydraulic cylinders 6a, 6b, pressurize water sucked into plunger chambers 3a, 3b to a superhigh pressure level are connected in parallel to a water discharge line 8, First and seco... | 06/03/1997 |
| 5617723 | Method for controlling an implement of a work machine A method for controlling an apparatus (100) for controllably moving an implement (102) is provided. The implement (102) is connected to a work machine (104) and is movable between first and second implement positions in response to operation of a hydrauli... | 04/08/1997 |
| 5607027 | Hydraulic drive system for a vehicle A hydraulic drive system for a vehicle includes a pressurizing circuit and a working circuit that are interconnected by suitable valving. The pressurizing circuit incorporates a fixed displacement pump which is driven by a prime mover having a nominal hor... | 03/04/1997 |
| 5556077 | Air lifting and balancing unit An air lifting and balancing unit including a cylinder, a piston in the cylinder, a ball screw affixed to the piston, a ball nut mounted for rotation on the ball screw, a drum mounted on the ball nut, a chain driven by the drum, and centrifugally actuated... | 09/17/1996 |
| 5537819 | Hydraulic device for working machine A hydraulic device for operating an actuator in a working machine such as a hydraulic shovel or the like has a solenoid-operated proportional flow regulating valve connected to a pipe between a hydraulic pump and a directional control valve for changing t... | 07/23/1996 |
| 5533333 | Method and regulator for regulating the air pressure of a pressurized vessel A regulator for controlling the air pressure of compressed air in an air reservoir which serves as a source of motive compressed air for an air driven device is provided. A method is provided for maintaining sufficient operating pressure of a pressurized ... | 07/09/1996 |
| 5520368 | Air lifting and balancing unit with constant force pneumatic circuit An air lifting and balancing unit including a cylinder, a piston in the cylinder, a ball screw affixed to the piston, a ball nut mounted for rotation on the ball screw, a drum mounted on the ball nut, a chain driven by the drum, and centrifugally actuated... | 05/28/1996 |
