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| Number | Title | Issue Date |
| 7987764 | Flow control apparatus for heavy construction equipment A flow control apparatus for heavy construction equipment is provided, which can prevent overspeed and abrupt operations of an actuator due to an excessive flow rate during an initial operation of the actuator when a composite work is performed by simultaneously ope... | 08/02/2011 |
| 7946215 | Actuator controller Actuator controller comprising a body (12) with an inlet port (14) coupled to a source of pressurized fluid and in flow communication with primary and secondary spool bores (16, 20); primary and secondary spools (60, 62); first and second... | 05/24/2011 |
| 7882777 | Hydraulic pressure control apparatus and hydraulic circuit A supply passage, a discharge passage, an actuator passage, and a spool bore are defined in a housing. The spool bore accommodates a spool and communicates with the supply passage, the discharge passage, and the actuator passage. Load pressure detection circuit sect... | 02/08/2011 |
| 7621211 | Force feedback poppet valve having an integrated pressure compensator The force feedback poppet valve includes a valve body having a main chamber, a first port, and a second port. The force feedback poppet valve further includes a main poppet disposed within the main chamber and movable between an open position and a closed position t... | 11/24/2009 |
| 7614336 | Hydraulic system having augmented pressure compensation A hydraulic system is disclosed having a source of pressurized fluid, at least a one hydraulic actuator, and a first valve. The first valve has a first valve element movable relative to a first valve bore between a plurality of positions from a first position in whi... | 11/10/2009 |
| 7603940 | Hydraulic controller arrangement What is disclosed is a hydraulic controller arrangement for the pressure medium supply of a hydraulic consumer, e.g., of the rotating gear of a mobile work machine. At low pressure medium flow rates, the pressure medium flow rate draining from the consumer is backed... | 10/20/2009 |
| 7380489 | Hydraulic circuit for option device of heavy construction equipment Disclosed is a hydraulic circuit for an option device of heavy construction equipment which can facilitate manipulation of the option device such as a breaker and optionally control a flow rate by supplying hydraulic fluid from a hydraulic pump to the option device ... | 06/03/2008 |
| 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 |
| 7337807 | Hydraulic control valve with regeneration function The present invention A hydraulic control valve with a regeneration function, including a main body formed of a supply fluid passage to which pressurized fluid is supplied, at least one port, a tank fluid passage for discharging the pressurized fluid to an outside s... | 03/04/2008 |
| 7325397 | Device for continuously supplying compressed air from a portable container to a pneumatic tool by greatly reducing pressure of compressed air and then precisely adjusting same A two stage pressure regulating device is disclosed. The device is adapted to supply compressed air from a portable container having a pressure of about 150 kg/cm2 to a pneumatic tool by first greatly reducing pressure of compressed air in the container t... | 02/05/2008 |
| 7264019 | Controlled-flow hydraulic distributor The hydraulic distributor exhibits a cylindrical and internally-hollow body (2) having an inlet chamber (3) for a fluid and an outlet chamber (4) which are interconnected directly (by a communication conduit), or indirectly by an external distri... | 09/04/2007 |
| 7263924 | Hydraulic circuit and its valve gear To simplify a circuit structure and a path structure in a hydraulic circuit having a pilot check valve and an overload relief valve and to reduce the size of a gear. The hydraulic circuit includes a pump port; a tank port; a first actuator port; a second actuator po... | 09/04/2007 |
| 7249554 | Hydraulic control arrangement What is disclosed is a hydraulic control arrangement for controlling a consumer, comprising a continuously adjustable directional control valve, an individual pressure compensator associated to the latter, as well as shut-off blocks arranged downstream from the dire... | 07/31/2007 |
| 7243493 | Valve gradually communicating a pressure signal A valve is provided for a hydraulic system having a source of pressurized fluid, a fluid actuator, and a proportional pressure compensating valve. The valve has a bore in fluid communication with the source and the fluid actuator. The valve also has a valve element ... | 07/17/2007 |
| 7219593 | Saturation-proof hydraulic control device that is composed of two or more elements The invention refers to the field of hydraulic control devices and refers to a saturation-proof hydraulic control device with two or more elements; each element is composed of a six-way, two-position spool (4) of the proportional type, a pressure compensator ... | 05/22/2007 |
| 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 |
| 7210393 | Progressive-starting unit for pneumatic systems A progressive-starting unit for pneumatic circuits comprises a line inlet and a line outlet interconnected with each other by a regulating valve that is piloted by a pneumatic piloting inlet. The piloting inlet is controlled by the outlet of a progressive-starting d... | 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 |
| 7204185 | Hydraulic system having a pressure compensator A hydraulic system having 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 source with the first chamber and a second valve con... | 04/17/2007 |
| 7194345 | Compressed air processing system for motor vehicles A compressed air processing system for motor vehicles includes a pressure control unit, an air dryer, a multi-circuit protection valve and an electronic control unit. The electronic control unit controls the valves of the pressure control unit, the valves of the air... | 03/20/2007 |
| 7182097 | Anti-saturation directional control valve composed of two or more sections with pressure selector compensators The invention relates to the field of hydraulic directional control valves and refers to an anti-saturation directional control valve (V) composed of two or more sections in each of whom there is a pressure selector compensator with a six-way two-position spool (... | 02/27/2007 |
| 7174826 | Hydraulic crowd control mechanism for a mining shovel A crowd control mechanism for a power shovel includes an extendible dipper handle having an extended position and a retracted position. A double acting hydraulic cylinder having a an extendible ram has one of the cylinder and the ram fixed to the dipper handle and t... | 02/13/2007 |
| 7121812 | High pressure pump having replaceable plunger/valve cartridges A high pressure fluid jetting system generally includes a fluid cylinder pump, a drive assembly, a pressurized liquid supply and an applicator gun. The drive assembly includes a diesel engine or electric powered motor which drives a rotatable drive shaft. The drive ... | 10/17/2006 |
| 7036625 | Integrated hydraulic control system An integrated hydraulic control system includes a steering control unit and a priority flow divider integrated into a unitary casing. An interface fluidly couples the casing for the steering control unit and priority flow divider directly to a control valve casing. ... | 05/02/2006 |
| 7017470 | Flow control apparatus for construction heavy equipment Disclosed is a flow control apparatus for construction heavy equipment capable of maintaining constant set flow rate regardless of changes in load pressure and pump pressure. The flow control apparatus is composed of a control valve, a flow control valve, and a load... | 03/28/2006 |
| 6994116 | Distributing valve for the load-independent control of a hydraulic consumer in terms of direction and speed A directional control valve for a hydraulic load has, in a piston bore of a valve housing, a control piston which can be displaced axially in opposite directions from a central position and which has first fine control grooves for opening a connection between a load... | 02/07/2006 |
| 6978609 | Electrohydraulic servo door drive for operating a door, a window, etc. The invention pertains to an electrohydraulic servo door drive for operating a door, a window, or the like, with a hold-open function, where a valve is installed in the hydraulic circuit to implement the hold-open function. To create an electrohydraulic servo door d... | 12/27/2005 |
| 6971407 | Hydraulic valve arrangement The invention concerns a hydraulic valve arrangement with a supply connection arrangement, which has a high-pressure connection (P) and a low-pressure connection (T), a working connection arrangement, which has two working connections (A, B), which can be connected ... | 12/06/2005 |
| 6915729 | Variable flow control apparatus for actuator of heavy construction equipment The present invention relates to a variable flow control apparatus for an actuator of a heavy construction equipment capable of implementing constant flow of hydraulic fluid from a hydraulic pump to an actuator even when a pilot pressure capable of driving a seat va... | 07/12/2005 |
| 6904938 | Locking block There is disclosed a stop block for controlling a hydraulic consumer in which a main piston having an advanced opening can be lifted off a valve seat in a return function by means of a push piston. A pressure chamber confined by the main piston on the one hand and b... | 06/14/2005 |
| 6899012 | Fluid flow control valve assembly with independent feedback pressure A fluid flow control valve assembly that can be actuated using an electrically operated or pneumatically operated flow control valve includes a valve body having a fluid supply passageway, a fluid exhaust passageway, and a fluid bypass passageway. A pilot operated r... | 05/31/2005 |
| 6880332 | Method of selecting a hydraulic metering mode for a function of a velocity based control system The flow of fluid to a hydraulic actuator is controlled by a valve assembly which operates in different metering modes at various points in time. The metering mode to use in selected in response to the hydraulic load that acts on the valve associated with the hydrau... | 04/19/2005 |
| 6874526 | Hydraulic control device A hydraulic control device (10, 90) for load pressure-independent control of a double-acting motor, in which by replacing the pressure balance regulator throttle slide valve element (68, 93) but using the same housing (13), the control device ca... | 04/05/2005 |
| 6860291 | Directional control valve comprising an internal pressure regulator A directional control valve includes a pressure regulator piston configured as a hollow slide with a radial passage positioned in such a way that a connection from the internal chamber of the pressure regulator piston to a pump pressure annular channel (P) can be re... | 03/01/2005 |
| 6854270 | Hydraulic valve system A hydraulic valve system (1) has a supply connection arrangement 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 motor (2), with a direc... | 02/15/2005 |
| 6845702 | Hydraulic controller The present invention intends to improve a hydraulic control unit and prevent the occurrence of hunting as well as to reduce the size of the hydraulic control unit. The hydraulic control unit is used in a several-directional-control-valves-assembled-type hydr... | 01/25/2005 |
| 6837045 | Electrohydraulic lifting control device for industrial trucks In an electrohydraulic lifting control device (S) for stacker trucks, which comprises, for lifting control, an electrically operable three-way flow regulator (R1) in a lifting branch (1) between a pressure source (P) and a hydraulic cylinder (Z) as wel... | 01/04/2005 |
| 6786132 | Control device for hydraulically operated hoisting mechanisms A control device for hydraulically operated hoisting mechanisms used to raise and lower loads includes an electrically controllable throttle valve connected to a return line of the hoisting mechanism, and a pressure scale with at least one blocking position and one ... | 09/07/2004 |
| 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 |
| 6532989 | Hydraulic distributor A hydraulic distributor that has a regulating balance including a housing hollowed in the distributor body and containing coaxially a fixed central core. A tubular plunger is interposed sliding freely, coaxially, between the core and the housing and co-op... | 03/18/2003 |
