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8806866 Systems and methods for efficient two-phase heat transfer in compressed-air energy storage systems  
In various embodiments, foam is compressed to store energy and/or expanded to recover energy.
8807012 Harmonic engine  
An engine based on a reciprocating piston engine that extracts work from pressurized working fluid. The engine includes a harmonic oscillator inlet valve capable of oscillating at a resonant...
8807013 Boom cylinder control circuit for construction machine  
Disclosed is a boom cylinder control circuit for a construction machine including a boom cylinder having an ascending-side chamber and a descending-side chamber. The boom cylinder control circuit...
8801408 Piston pump for a vehicle brake system  
The invention relates to a piston pump for a motor vehicle braking system having a housing section and a piston guided displaceably in the housing section. The invention further has an intake...
8800958 Slow-acting on/off valve  
Disclosed is a slow-acting ON/OFF valve which includes a valve-opening pressure chamber that makes an actuating member (which actuates a valve body that comes into contact with and moves away from...
8800425 Percussion device  
The invention relates to a percussion device having a body and a percussion piston moving therein, pressure fluid spaces in the rear and front ends of the percussion piston and pressure fluid...
8800957 Pneumatically actuated liquid dispensing valve  
A liquid dispensing valve (12) including a liquid inlet (90) for receiving the liquid and a liquid outlet (92) for discharging the liquid. A valve member (44) is mounted for movement relative to...
8800426 Hydraulic load control valve device  
A hydraulic load control valve (10) accommodated between a hand valve (H) and a hydraulic engine (D) has got at least one proportional load control valve (E), controlled by the pump pressure...
8794491 Dispensing module and method of dispensing with a pneumatic actuator  
An adhesive dispensing module includes a pneumatic actuator for actuating reciprocating movement of a piston on a dispenser valve member. The pneumatic actuator includes a valve element and a...
8794124 Hydraulic pump or motor  
The present embodiments disclose an axial hydraulic pump including a residual pressure regenerating circuit (30) which is a pipe line communicating with a top dead center side communication port...
8794123 Double valve constructed from unitary single valves  
A double valve includes a first unitary valve assembly and a second unitary valve assembly. Each unitary valve assembly includes a first outlet port, a second outlet port, and a spool. A first...
8790091 Pump having port plate pressure control  
A pump is disclosed. The pump may have a housing, a body rotatably disposed within the housing and at least partially defining a plurality of barrels, a plurality of plungers associated with the...
8783161 Wobble plate type variable displacement compressor  
Disclosed is a wobble plate type variable displacement compressor that uses a constant velocity universal joint mechanism, which comprises an inner ring and an outer ring, balls that are held...
8776665 Brake installation with master cylinder and brake booster but no push rod  
Brake installation consisting of a master cylinder associated with a brake booster furnished with a motor driving an actuator piston and acting on the primary piston of the master cylinder by...
8776890 Systems and techniques to actuate isolation valves  
A tool that is usable in a well and may include an operator, a switch, a resilient device and an indexer. The switch may be configured to selectively communicate a first force to the operator,...
8777588 Flow-optimized cylinder drum for hydrostatic piston engines  
The invention relates to a cylinder drum (1′) for a hydrostatic piston engine, having at least one kidney-shaped control port/cylinder bore transition (5′, 5″, 5′″) which leads into a cylinder...
8776666 Hydraulic motor driving device  
A motor capacity change-over actuator 10 varies a capacity of a hydraulic motor 1 in accordance with the inflow/outflow of a working fluid into/out of a drive pressure chamber 72. A motor capacity...
8776513 Fluid-pressure actuator unit  
A fluid-pressure pump 2 rotated by an electric motor 9 drives a fluid-pressure cylinder 3. A discharge flow restrictor 15 is provided in a discharge passage 12 through which a working fluid from...
8770087 Hydraulic servo-drive device and variable turbo-supercharger using the same  
A hydraulic servo drive device includes: a pilot spool for switching supply and shutoff of oil; a servo piston slid in accordance with the pilot spool; a stroke sensor for detecting a displacement...
8770088 Reciprocating compressor  
A reciprocating compressor having an aperture control valve for an inlet passage. Sectional area of the inlet passage is maintained near the outlet holes of the aperture control valve,...
8770543 Proportional poppet valve with integral check valves  
A poppet valve assembly includes a body and first and second check valves. The body includes opposing first and second axial end portions. The first end portion has a first circumferential...
8763388 Hydraulic system having a backpressure control valve  
A hydraulic system for a machine is disclosed. The hydraulic system has a source of pressurized fluid, a fluid actuator, and a tank. The hydraulic system utilizes a directional control valve to...
8763513 Hydraulic control system and method  
A control system for controlling the movement of a system such as a hydraulic servo controlled gimbal systems. The system includes a plurality of actuators and sensors that sense the position of...
8763719 Pile driving systems and methods employing preloaded drop hammer  
A pile driving system for driving a pile. The pile driving system comprises a housing assembly, a hammer, a helmet member, and a lifting system. The housing assembly defines at least one vent...
8763390 Heat exchange with compressed gas in energy-storage systems  
In various embodiments, compressed-gas energy storage and recovery systems include a cylinder assembly for compression and/or expansion of gas, a reservoir for storage and/or supply of compressed...
8756930 Hydraulic system having implement and steering flow sharing  
A hydraulic system for a machine is disclosed. The hydraulic system may have a first pump with variable displacement and being load-sense controlled, and a first hydraulic circuit associated with...
8757045 Wobble plate type variable displacement compressor  
A wobble plate type variable displacement compressor uses a constant velocity universal joint mechanism, which comprises an inner ring and an outer ring, balls that are held between guide grooves...
8757988 Capacity control valve  
A capacity control valve for a variable-capacity compressor such as used in an air-conditioning system in a motor vehicle is provided, wherein foreign matter is prevented from being caught in the...
8752475 Method and system for improving vehicle braking  
An engine with a positive pressure assisted brake booster is disclosed. In one example, an operator applying vehicle brakes is assisted by positive pressure provided by a compressor coupled to an...
8752372 Regenerative hydraulic circuit for dump truck bin lift cylinder  
An articulated dump truck is provided with an electro-hydraulic bin control system including a proportional control valve for the bin lift cylinders and including a solenoid-operated regenerative...
8752371 Independent metering valve with flow limiter  
An independent metering valve (IMV) assembly is disclosed that includes a metering stem including an inlet. The IMV assembly also includes a hydro-mechanical control valve in communication with a...
8746127 Valve return spring with filter support for a pneumatic brake booster assembly  
A brake system includes a vacuum booster, a valve positioned within the vacuum booster, the valve including a valve member connected to a rod, the rod configured to move in a linear direction, an...
8746661 Hydro-pneumatic piston accumulator  
The invention relates to a hydro-pneumatic piston accumulator (1), particularly for vehicle suspension systems, consisting of an accumulator housing (2) and a separating piston (6), which is...
8742750 Speed sensor pick-up for fluid device  
A speed pick-up ring includes a main body having a plurality of targets and defining a plurality of notches. Each notch is disposed between adjacent targets. Each notch includes a base wall, a...
8739680 Hydraulic pressure feedback for servovalves  
A spool for a servovalve. The spool includes a first end land and a second end land. The spool includes an intermediate land having a first side and a second side opposite the first side. The...
8739681 Valve apparatus  
A valve apparatus for setting and monitoring the clamping pressure of a clamping device (9) for workpieces to be clamped, in particular in lathes, has at least one pressure control valve (1A, 1B)...
8739679 Apparatus to eliminate back drive in push pull system of rotor aircraft and related methods  
Apparatus and methods for eliminating back drive in a push pull type control system, are provided. An exemplary apparatus includes a control rod including a pair of spaced apart piston...
8739678 Hood-lifting actuator with disarmable return braking arrangement  
The triggered stroke actuator comprises a cylinder (12) housing a movable assembly constituted by a piston (13), a rod (16) projecting from one end of the cylinder (12), and a slidable element...
8733300 Internal combustion engines  
An internal combustion engine comprises a chamber having a longitudinal centerline, inlet valving operable to admit constituents of a combustible mixture into the chamber for combustion therein to...
8734127 Hydraulic pump-motor and method of preventing pulsation of hydraulic pump-motor  
A pressure regulating restriction for allowing a cylinder bore and a valve plate discharge port to communicate with each other before the cylinder bore communicates with the valve plate discharge...
8727740 Cylinder assembly for providing uniform flow output  
An assembly in accordance with an embodiment of the present invention for providing a substantially uniform output flow from at least one piston of a pump powered by a prime mover includes at...
8731787 Transporter vehicle  
A control valve device comprises two direction control valves. The direction control valve includes an expansion side variable throttle portion and a contraction side variable throttle portion....
8726786 Stack valve having bucket parallel movement function  
A stack valve 1 includes an ascending dividing valve 14 which is provide on an ascending junction path 23 and controls the flow rate of a pressure fluid supplied to a head-side chamber 4a of a...
8726785 Hydraulic drive system and diagnostic control strategy for improved operation  
A method and apparatus are provided for hydraulic fluid supply between a hydraulic pump and a hydraulic drive unit, switching hydraulic fluid flow direction to the hydraulic drive unit or stopping...
8714195 Fluid control valve  
A fluid control valve wherein a main valve body includes: a high-pressure passage providing communication between a suction port and a sleeve in which a spool is fitted; a tank passage providing...
8696337 Plunger type water pump  
A plunger type water pump mainly comprises a cavity body, a rotary main shaft and a plunger flow-distributing unit. The plunger flow-distributing unit comprises a flat valve assembly, a...
8695478 Method of operating a motor vehicle brake system  
In order to impart a pleasant brake pedal feeling to the operator in the transition from a ‘conventional mode’ to a ‘brake-by-wire’ mode, it is disclosed that the travel (s) covered upon...
8695333 Method for when necessary automatically limiting a pressure in a hydraulic system during operation  
A method is provided for, when necessary, automatically limiting a pressure in a hydraulic system during operation. A system is arranged to deliver pressurized hydraulic fluid to at least one...
8689673 Energy conversion devices and systems including the same  
Methods and apparatus for converting energy from a stream of compressed gas into mechanical work as systems incorporating such methods and apparatus.
8689674 Axial piston machine with rotation restraint mechanism  
A reciprocator restraint assembly for a Z-crank axial piston machine is described. The assembly includes two gimbal arms each linked together at gimbal link joint that intersect at a point T....