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| Number | Title | Issue Date |
| 7320335 | Electrohydraulic control device A electrohydraulic control device H for the direction control of a hydro-motor, particularly for working pressures u to more than about 450 bar in a portable working device, comprises working lines A, B and a pressure line P and a respective load holding valve LA, L... | 01/22/2008 |
| 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 |
| 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 |
| 7140169 | Feeder controls for a forage harvester An agricultural harvesting machine, such as a forage harvester comprises a set of feedrolls (20, 21, 26, 27) for feeding harvested crop material to a rotating cutterhead (36). The feedrolls are driven by a hydraulic drive means comprising a hydrostatic... | 11/28/2006 |
| 7090475 | Hydraulic control circuit for a hydraulic engine with at least two speeds A hydraulic control circuit for a radial piston engine with two speeds. The changeover between the speeds takes place through the alteration of the absorption volume, the delivery side being connected to the discharge side with a bypass connection by a valve arrange... | 08/15/2006 |
| 6996982 | Method and device for switching hydraulic fluid supplies, such as for a hydraulic pump/motor A spool valve includes a first valve port coupled to a fluid source at a first pressure range, a second valve port coupled to a fluid source at a second, lower, pressure range, and first and second output ports coupled to a hydraulic device. The valve includes a val... | 02/14/2006 |
| 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 |
| 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 |
| 6964281 | Multiple hydraulic spool valve assembly with a monolithic body An assembly of a plurality of hydraulic control valves is housed in a single-piece body. For each control valve, a spool bore and an aperture for a pressure compensation valve are provided in the monolithic body. Each spool bore is connected to several return passag... | 11/15/2005 |
| 6922923 | Change-over valve for boom cylinder of excavating/slewing work truck In an excavating/slewing work truck, the boom falls freely at the time of lowering operation without requiring any power but the flow rate of a pump increases excessively when the speed is balanced with other acutuators and power loss is inevitable for enhancing the... | 08/02/2005 |
| 6915730 | Spool-type hydraulic directional control valve having reduced cavitation A spool-type hydraulic directional control valve having improvements to reduce cavitation when the spool is in the float position. The flow area of a first passageway on the valve spool is appropriately sized to reduce the flow hydraulic fluid flow from the head end... | 07/12/2005 |
| 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 |
| 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 |
| 6505645 | Multiple hydraulic valve assembly with a monolithic block A valve assembly has a single piece body that houses a plurality of hydraulic valves. Each valve includes a spool which controls the flow of fluid between a pair of work ports in one side of the body and a pump inlet and a tank outlet. The valves are oper... | 01/14/2003 |
| 6314997 | Multiple valve apparatus A multiple valve apparatus is formed of a priority valve mechanism for dividing an operating liquid into a priority flow and a surplus flow, at least one switching valve mechanism attached to the priority valve mechanism, a parallel line for guiding the s... | 11/13/2001 |
| 6267141 | Hydraulic directional control valve A hydraulic directional control valve with a regulating balance comprising a plunger which can be displaced in a housing (13) under the action of a differential pressure (Ɗp) between the intake pressure (P) and the highest load pressure (LS), and which i... | 07/31/2001 |
| 6192929 | Hydraulic controller The present invention provides a hydraulic controller comprising: a plurality of switching spools; a plurality of cylinder ports of a switching valve; a compressed oil passage common to the switching valves having an intermediate chambers, at least a chec... | 02/27/2001 |
| 6176261 | Hydraulic control device In a hydraulic control device for the direction control of at least one highest hydraulic pressure hydro-motor with working pressures above about 400 bar from a pressure source the hydro-motor is connectable via at least one consumer line and two leakage-... | 01/23/2001 |
| 6164068 | Variable pressure hydraulic systems A variable pressure hydraulic system includes a hydraulic pressure source which is selectively connected to a hydraulic system or to drain, via a control valve and a pressure transducer; the control valve in a first position isolating the pressure source ... | 12/26/2000 |
| 6161586 | Tournament oil path constituting apparatus A tournament oil path constituting apparatus in which while a laminated block is constituted by laminating a number of oil path plates, a number of shuttle valve holes and connection grooves made continuous to the shuttle valve holes are formed at overlap... | 12/19/2000 |
| 6158462 | Hydraulic pressure control device The present invention is directed to a hydraulic pressure control device which can overcome problems, such as a shock to an actuator or a pressure boost phenomenon involving a rapid increase in pump delivery pressure, conventionally encountered when a dir... | 12/12/2000 |
| 6135149 | Pressure compensating valves Pressure compensating valves disposed at inlet sides of directional control valves are each configured with a step-shaped spool having a larger diameter portion and smaller diameter portions and pressure receiving chambers are provided to sandwich the lar... | 10/24/2000 |
| 6105613 | Distributor for a hydraulic hoist which is controllable with regard to position and applied force, for tractors and agricultural machines A distributor for a hydraulic hoist which is controllable with regard to position and applied force, for tractors and agricultural machines, comprises a compact body having at least one inlet duct for a pressurized fluid, at least one discharge duct and a... | 08/22/2000 |
| 6098403 | Hydraulic control valve system with pressure compensator An improved pressure-compensated hydraulic system includes a separate valve section which feeds hydraulic fluid from a variable displacement pump to one of several hydraulic actuators. Each valve section has a main valve spool and a pressure compensating ... | 08/08/2000 |
| 6089248 | Load sense pressure controller DANA 90 A load sense pressure controller used with a hydraulic control valve such as a hydraulic direction control valve includes a body in the form of a barrel having a threaded first end and a threaded second end. An externally threaded first plug is th... | 07/18/2000 |
| 5996623 | Hydraulic directional-control valve A hydraulic directional-control valve comprises a first inlet part, a second inlet part, a tank port, a work part and a valve member which is movable from a neutral position to a operating position. In the neutral position, the valve member connects the f... | 12/07/1999 |
| 5957159 | Directional control valve with flow distribution valves A pair of directional control valves 8 and a pair of hold check valves 9 are disposed respectively between a pair of metering notches 6, which are formed in a land 4-1 of a spool 2 and have functions of both flow rate control and direction control, and a ... | 09/28/1999 |
| 5890362 | Hydraulic control valve system with non-shuttle pressure compensator An improved pressure-compensated hydraulic system for feeding hydraulic fluid from a variable displacement pump to multiple hydraulic actuators. A separate valve section controls the fluid flow between the pump and a different actuator. Each valve section... | 04/06/1999 |
| 5845678 | Pressurized fluid supply system A direction control valve is formed by providing a main spool for establishing and blocking communication between an inlet port, first and second actuator ports and first and second tank ports. A pressure compensation valve comprising a check valve portio... | 12/08/1998 |
| 5778929 | Directional control valve assembly having a pressure compensation valve A directional control valve assembly having a pressure compensation valve in which there are provided a directional control valve in which a main spool is slidably inserted in a spool bore that is formed with a pump port, a first and a second load pressur... | 07/14/1998 |
| 5778930 | Add-in device for a hydraulic control arrangement An add-in device for a hydraulic control arrangement provides a function unit (24) to be arranged between successive modules, which function unit takes the connection between the pump channels of the preceding and the subsequent module by way of at least ... | 07/14/1998 |
| 5765594 | Hydraulic control valve A hydraulic control valve for controlling flow between a pump, a hydraulic device, and a vessel containing hydraulic fluid. The control valve has an elongated valve slide which is slidably mounted in an elongated valve housing. The valve has three positio... | 06/16/1998 |
| 5752546 | Fluid control valves Fluid control valves are combined to form a layered multi-directional valve, each having a high-pressure port connected to a high-pressure source, a tank port opened to a low-pressure region, an actuator port, a spool capable of connecting said actuator p... | 05/19/1998 |
| 5735305 | Unloading system for hydraulic circuit An unloading system including an unload valve draining a part of supplied pressurized fluid to a tank and a switching valve for draining a pressurized fluid for biasing the unload valve in a direction for reducing a flow rate of the fluid supplied to the ... | 04/07/1998 |
| 5592967 | Control valve with variable priority function In a hydraulic device including at least two actuators both adapted to be operated by a single pump, one of the actuators having priority over the other actuator, a control valve for the one actuator including a load hold check valve adapted to assign a v... | 01/14/1997 |
| 5586577 | Mono-block control valve with side bypass passage An improved mono-block control valve having a side bypass passage substituting for a typical center bypass passage is disclosed. The side bypass passage simplifies the passage structure of the valve body into a two-dimensional structure, thereby remarkabl... | 12/24/1996 |
| 5515879 | Load sensed multi-purpose pressure control valve A pressure control valve having a housing with a main inlet passage and a bypass outlet passage. A combined control is located in the housing to control the flow of fluid from the main inlet passage to the bypass outlet passage. The combined control inclu... | 05/14/1996 |
| 5501136 | Control system for a hydraulic motor A control means for a hydraulic motor connected to an external load comprises a directional valve (10) for selectively feeding hydraulic fluid to the motor from a pressure source and including load pressure sensing means (24, 25) connected to a load compe... | 03/26/1996 |
| 5487403 | Variable discharge pump with low unload to secondary A load sensed variable output gear pump system including a pump within a housing, an inlet passage extending to a pump inlet and an outlet passage extending from a pump outlet. A secondary outlet passage is located in the housing and a bypass outlet passa... | 01/30/1996 |
| 5471839 | Valve apparatus and hydraulic drive system A valve apparatus has a casing (11; 41) formed therein with at least one pair of spool bores (12a, 13c, etc.; 42a, 43a), a single common pump port (19), at least one tank port (16t) and a plurality of actuator ports (22a, 23a, etc.) including a pair of ac... | 12/05/1995 |
