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7900549 Cushion ring and fluid-pressure cylinder  
A cushion ring which is used between a rod-side cylinder head and a piston rod of a fluid-pressure cylinder and which is externally fitted on the piston rod to cushion a shock in the vicinity of...
7895833 Hydraulic drive apparatus  
A hydraulic drive system is mounted on a hydraulic excavator, and is provided with a directional control valve 23 for a boom, a directional control valve 24 for an arm, a boom control device 25 for...
7886652 Positioning control mechanism for single-acting air cylinder  
An electromagnetic operation-type automatic pressure-adjusting valve outputting an air pressure corresponding to an amount of electric power is connected in an air flow path connecting a pressure...
7887302 High pressure variable displacement piston pump  
A variable flow pump includes: a housing with inlet and outlet chambers interconnected by a main bore and a non-rotating cylinder block positioned in the main bore. The cylinder block includes: a...
7882778 Hydraulic actuator with floating pistons  
A hydraulic actuator is configured to provide redundant boost control to an aircraft within approximately the same space required by a single hydraulic cylinder. The hydraulic actuator includes a...
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...
7878422 Variable dampening rate suspension system  
A variable rate suspension system for a boom sprayer including a lift assembly and chassis. The suspension system includes a needle valve fluidly connected to a hydraulic accumulator and a first...
7877997 Wastegate control system based on variable valve actuation  
A hydraulically operated wastegate valve control system for a turbocharged internal combustion engine is disclosed. The control system includes a hydraulically operated wastegate valve configured...
7878263 Pressure-fluid-operated percussion device  
A pressure-fluid-operated percussion device includes a frame allowing a tool to be arranged movably in its longitudinal direction. Pressure liquid is fed to the percussion device and returned to a...
7874241 Electronically controllable and testable turbine trip system  
A tripping control system for use with, for example, turbines, includes a block circuit having two or more redundant blocking valves disposed or connected in series within a pressure supply line to...
7874152 Hydraulic system with compensation for kinematic position changes of machine members  
A machine, such as a backhoe, has a series of components connected in series and moved by separate hydraulic actuators. A position estimator determines the present position of each component from...
7874155 Systems and methods for energy storage and recovery using rapid isothermal gas expansion and compression  
The invention relates to systems and methods for rapidly and isothermally expanding and compressing gas in energy storage and recovery systems that use open-air hydraulic-pneumatic cylinder...
7870817 Actuator using fluid cylinder and method of controlling the same  
An actuator using a fluid cylinder in which rigidity may be attained with a simple configuration, includes a fluid cylinder, a first choke valve device, and a second choke valve device. The first...
7870729 Hydraulic control device  
The invention relates to a hydraulic control device for a priority, first hydraulic consumer and a subordinate, second hydraulic consumer, pressure medium being deliverable to the first or the...
7866151 Anti-saturation valve assembly for load sensing hydraulic system  
An anti-saturation valve assembly (51) for use in a hydraulic system having priority (17) and auxiliary (25) load circuits, the priority circuit providing a priority load signal (19). The...
7866252 Gasket, cover with gasket, and pneumatic cylinder with cover and gasket  
A gasket includes a damping buffer (1) for a piston (2) that can be charged with a pressure medium and that can be moved back and forth axially in a cylinder pipe (3) and includes at least one...
7866251 Power plant  
A power plant produces power by using high pressure gas to push a piston. The power plant uses a supply device to provide the high pressure gas to a cylinder and controls an admission valve and an...
7863767 Turbine driven electric power production system and a method for control thereof  
A turbine (2) driven electric power production system (1),—said turbine (2) arranged for being driven by a fluid (3) having a fluid speed (v) varying in time,—said turbine (2) connected to a hyd...
7862308 Rotary reciprocating pump  
A rotary reciprocating pump comprises: i) a pump housing having intake and discharge ports; a shaft driven rotary piston carder, rotatably carrying pistons circularly arranged therearound; ii) a...
7861641 Impulse generator and method for impulse generation  
The invention relates to an impulse generator for a rock breaking tool, the impulse generator (2) comprising a main chamber (4) for receiving a first pressurizeable fluid volume (6), an in the main...
7861642 Valve block, tool attachment, a working machine and the use of a valve block  
A valve block disposed adjacent a tool attachment of a working machine, where the tool attachment is adapted for connection to different types of hydraulically maneuvered tools or implements with...
7856918 Pneumatic brake booster comprising a force sensor  
A pneumatic brake booster 1 comprising: a sealed structure 3 comprising a rigid casing 11 forming a funnel 19 furnished with an opening and a movable wall 13 dividing the sealed structure 3 into a...
7854115 Post-pressure compensated hydraulic control valve with load sense pressure limiting  
An array of valve sections in a hydraulic system are connected to a supply line, a tank return line, and a load sense line. One valve sections includes a control valve with a metering orifice...
7849686 Valve assembly and a hydraulic actuator comprising the valve assembly  
A valve assembly (2) forming a bridge circuit and a hydraulic actuator comprising at least one valve assembly (2) are disclosed. The valve assembly (2) is fluidly connectable between a fluid source...
7849687 Electrohydraulic solar panel carrier adjusting device  
A solar panel carrier T is provided at a sub-structure U such that it can be rotated and tilted by means of hydrostatic rotation and tilt motors M, M′. In an electrohydraulic adjusting device for t...
7845169 Drift compensation control method for a machine  
A method of controlling a machine having a hydraulically actuated linkage includes lowering a load suspended by the leakage at least in part by leaking hydraulic fluid from a portion of a hydraulic...
7845268 Asymmetric volume booster arrangement for valve actuators  
An asymmetric volume booster assembly includes an actuator movable in a first direction and a second direction, a first booster in fluid communication with the actuator, and a second booster in...
7836690 Positioning control mechanism for double-acting air cylinder  
Between an air source and a first pressure chamber of a double-acting main cylinder having a length measurement sensor for measuring an acting position of a piston, a supply solenoid valve is...
7832427 Control valve arrangements  
A valve arrangement includes a valve member, which rotates continuously in one sense. The generally cylindrical head of the valve member, within the housing, is formed to co-operate with various...
7827903 Fluid operated device with improved seal valve  
A seal valve arrangement is provided for a hydraulic device (10). The hydraulic device has an inner bore (14). The seal valve arrangement includes an element (45) disposed in the bore. The element...
7827901 Free swinging piston heat machine  
The invention relates to positive-displacement free-piston heat machines with variable working chambers, which could be applied as an internal or external combustion engine, compressor, pump. The...
7827785 Hydraulic system with warm up circuit  
A hydraulic control system in which a pump for pressurized hydraulic fluid connects with a valve assembly having a valve element displaceable in a chamber to selectively direct fluid to a load...
7828245 Dual motor dual concentric valve  
An actuator control system has a dual concentric servo valve having a spool and at least one motor adapted to selectively displace the spool.
7823803 Integrated breakaway cylinder and method for constructing a boom assembly  
An integrated breakaway cylinder for controlling a boom of a self-propelled sprayer and method for constructing a boom assembly is disclosed in the present application. The integrated breakaway...
7823385 Turbocharger with wastegate  
This invention relates to an actuator assembly for a turbocharger pressure control valve assembly and a method of assembling a pressure control assembly of a turbocharger. The assembly comprises an...
7818967 Method for controlling a crane actuator  
The invention relates to a method and an apparatus for controlling an actuator (7, 8) of a crane by control means (10) in a situation where the lifting power of the actuator (7, 8) of the crane is...
7814751 Motor vehicle braking system with spring adjusted brake pedal feel  
A compliance spring is disposed between the brake pedal and the primary piston of a master cylinder, preferably between the push rod and the primary piston of the master cylinder. Selection of the...
7814823 Feedback link for swash plate-type variable displacement hydraulic rotary machine  
A feedback link which transmits a movement of a servo piston to a control sleeve of a regulator is constituted by a link lever formed of a rigid material and an expansion spring formed of a spring...
7814750 Device for supplying pressure to a piston actuator  
A device for supplying pressure from an energy storage device to a piston gear shifting actuator by way of a valve device is provided. A pressure regulating and/or control device is used to...
7811318 Apparatus and method for pneumatically driving an implantable medical device  
A driver is disclosed for powering a pneumatically operated implantable device, such as an artificial heart with a left and a right ventricle. The driver includes a pair of compressors that each...
7810424 Device for increasing pressure in cylinders with control unit  
In order to increase the pressure of the hydraulic medium in cylinders, especially those of the hydraulic longwall construction used in underground mining and tunnel construction, a control unit 21...
7810585 Bi-directional rotary steerable system actuator assembly and method  
Methods and apparatuses to direct a drill bit of a directional drilling assembly are disclosed. The methods and apparatuses employ the use of bi-directional actuators that are capable of displacing...
7802426 System and method for rapid isothermal gas expansion and compression for energy storage  
The invention relates to systems and methods for rapidly and isothermally expanding gas in a cylinder. The cylinder is used in a staged hydraulic-pneumatic energy conversion system and includes a...
7798052 Fluid pressure cylinder  
First and second cushion rings are arranged respectively on both end surfaces of a piston constituting part of a fluid pressure cylinder, through fitting grooves. The first and second cushion rings...
7793740 Ride control for motor graders  
A ride control arrangement for a machine having a frame, a ripper, a hydraulic actuator operative to move the ripper includes at least one accumulator assembly, and a valve mechanism operatively...
7794212 Multi-piston pump/compressor  
A pump/compressor that utilizes a wedge at a fixed angle to operate the pump's pistons at a fixed stroke. Alternatively the wedge can be moved axially to increase or decrease the clearance volume....
7789190 Hydraulic steering  
The invention concerns a hydraulic steering (1) with a steering unit (2) with feedback behavior, a steering motor (8) connected to the steering unit (2) via working pipes (L, R), a steering member...
7789011 Method for operation of a selector cylinder of an electro-pneumatic selector unit for a motor vehicle gearbox  
A method for actuating a shift cylinder (1) of an electro-pneumatic control unit for the gearbox of a motor vehicle. The gearbox comprising a main gearbox, a group gearbox or other shifting...
7788914 Apparatus operating hydraulic actuator for valve  
The present invention relates to an apparatus operating a hydraulic actuator for valve, which can manually operate the hydraulic actuator for opening and closing the valve by which a flow rate is...
7785083 Dynamic fluid device  
The dynamic fluid device has a first pumping arrangement and second pumping arrangement arranged in parallel with each other to pump a pressurized fluid to user devices; at least a distributor...