Class / Patent application number | Description | Number of patent applications / Date published |
091468000 | Self-acting valve (432) (446) (451) (452) | 18 |
20080271596 | 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 choke valve device is disposed between a fluid pressure source and a first chamber, and the second choke valve device is disposed between the fluid pressure source and a second chamber. An opening of a valve of a discharge valve mechanism included in each of the choke valve devices is set so as to be in inverse proportion to a target pressure in the chamber in which the fluid pressure is adjusted by the choke valve device. | 11-06-2008 |
20090145292 | Hydraulic System for controlling a belt-driven conical-pulley transmission - A hydraulic system for controlling a belt-driven conical-pulley transmission. A pump draws a working medium from a working medium tank or through a cooler return valve from a cooler return line. The cooler return valve is a minimum pressure valve that holds closed a connection between the cooler return line and a pump inlet line through the cooler return valve, as long as the pressure in the cooler return line remains below a specified minimum pressure. The cooler return valve also opens the connection between the cooler return line and the pump inlet line through the cooler return valve as soon as the specified minimum pressure in the cooler return line is exceeded. | 06-11-2009 |
20100050858 | 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 and second lift arm cylinder. A control block provides hydraulic fluid to the system and lift arm cylinders. Dampening of vertical accelerations encountered by the chassis and transmitted to the boom sprayer through the lift assembly is controlled by adjusting the rate hydraulic fluid flows from the cylinders into the accumulator using the needle valve. | 03-04-2010 |
20100139476 | VALVE ARRANGEMENT HAVING INDIVIDUAL PRESSURE SCALE AND LOAD-LOWERING VALVE - The invention discloses a valve arrangement for supplying pressure medium to a hydraulic load ( | 06-10-2010 |
20100326267 | HYDRAULIC CYLINDER - An object of the present invention is to provide a hydraulic cylinder enabling a reduction in a stress generated by the pressure of hydraulic fluid at a welded portion of a case containing a damping valve. A piston ( | 12-30-2010 |
20110120297 | Hydraulic Circuit - A hydraulic circuit includes a control valve connected to a pump, a hydraulic reservoir, hydraulic work connections and a cylinder. A controllable check valve is connected between the work connections and the control valve. An overpressure safety device is connected between each work connection the corresponding check valve. In order to prevent sagging of a load on the cylinder, the overpressure safety device discharges hydraulic fluid between the check valve and the work connection to reduce an overpressure. The overpressure safety device includes an overpressure valve and a throttle connected downstream of this valve to throttle the flow of hydraulic fluid discharged through the overpressure safety device. | 05-26-2011 |
20110197751 | RECIPROCATING PISTON MACHINE - A reciprocating piston machine is proposed, in particular, for motor vehicles, comprising
| 08-18-2011 |
20110265642 | Double-Acting Subterranean Pump - The invention relates to a double-acting pump system for use in moving a fluid. The pump system includes a means for inputting power at a location remote from the double-acting pump. The system allows for manual power input, such as through a local pumping unit. The double-acting pump may define an interior volume and include a first end chamber in fluid communication with the local pumping unit, a second end chamber in fluid communication with the local pumping unit, a central chamber having a separating section, and a driving element (e.g., a double-ended piston) slidably located within the interior volume of the double-acting pump. The separating section may include an inlet valve section (e.g., two inlet valves) and an outlet valve section (e.g., two outlet valves). | 11-03-2011 |
20120011997 | Fluid Working Machine with Cylinders Coupled to Split Exterior Ports by Electrohydraulic Valves - An apparatus includes a first plurality of cylinders, each coupled to a shared first port by a separate first valve and to a shared second port by a separate second valve. Each first and second valve has a chamber to which pressure from either the associated cylinder or the respective port is dynamically applied to select different operating modes. Each one of a second plurality of cylinders is coupled to the first port by a separate third valve and to a shared third port by a separate fourth valve. Each third and fourth valve has a chamber to which pressure from either the associated cylinder or the respective port is dynamically applied to select different operating modes. Selecting an operating mode enables the apparatus to act as a bidirectional pump or a hydraulic motor. Selectively controller the valves can deactivate an individual cylinder, while other cylinders remain active. | 01-19-2012 |
20120024145 | HYDRAULIC MOTOR DRIVING DEVICE - A motor capacity change-over actuator | 02-02-2012 |
20120036993 | COMPRESSOR VALVE ARRANGEMENT - An arrangement for a compressor ( | 02-16-2012 |
20120042773 | Pump Piston Device - A pump piston device is for reciprocating movement in a pump cylinder. Between the pump piston and the pump cylinder, an annular space is formed which is defined by a first seal and a second seal, the annular space being pressurized, and the first seal and the second seal being in a common piece of material which constitutes the pump piston. | 02-23-2012 |
20120060683 | VACUUM PUMP WITH VENTILATING MEANS - A vacuum pump for supplying a machine assembly with a negative pressure includes a housing and a housing cover surrounding a delivery chamber. The delivery chamber includes a low-pressure region having a working inlet connected to the assembly, and a high-pressure region having a working outlet. A delivery member moveable within the delivery chamber, which, when moved, suctions air into the delivery chamber through the working inlet and expel it at an increased pressure through the working outlet. An outlet valve is arranged at or downstream or the working outlet and at least makes it difficult for air to flow back into the delivery chamber. The delivery chamber is connected to the external environment of the vacuum pump via a ventilating connection in order to establish at least partial pressure equalization with the external environment when the delivery member is stopped and a negative pressure prevails in the delivery chamber. | 03-15-2012 |
20120090457 | ANNULAR SPRING ELEMENT FOR A HYDRAULIC BELT TENSIONER - A hydraulic tensioning system ( | 04-19-2012 |
20120152107 | FLOW REGENERATION HYDRAULIC CIRCUIT - A hydraulic circuit capable of both a regeneration mode of operation and a full force mode of operation includes a poppet valve controlled by a control valve operating in conjunction with a shuttle valve. The opening of the poppet valve enables the regeneration mode of operation, and the closing of the poppet valve enables the full force mode of operation. | 06-21-2012 |
20130055887 | MULTIPLE VALVE HEAD COMPRESSOR APPARATUS - A multiple valve compressor head having a casing defining an intake chamber in selective communication with a cavity through a plurality of one-way intake valves and an exhaust chamber in selective communication with the cavity through a plurality of one-way exhaust valves is disclosed. The casing further defines an inlet port for the entry of gas into the intake chamber and an outlet port for forcing out compressed gas from the exhaust chamber. In operation, the multiple valve compressor head is in operative engagement with a reciprocating diaphragm that draws the gas into the intake chamber and then the cavity during the intake stroke of the diaphragm, while expelling compressed gas from the cavity and through the outlet port during the exhaust stroke of the diaphragm. | 03-07-2013 |
20130092019 | Cylinder Head for a Compressor - A cylinder head for a compressor includes a closure device that can be adjusted between an unactuated position (off-load) in which the compressor delivers air and an actuated position (off-load) in which the compressor is running in an idle mode, a pneumatic control device having a control cylinder and a control piston that can be moved in the control cylinder, a spring device that prestresses the closure device into the unactuated position (on-load), and a driver configured to couple the control piston to the closure device. The closure device closes a compressed air passage in the unactuated position (on-load) and clears the compressed air passage in the actuated position (off-load), and the driver is permanently connected to the closure device and can be driven by the control piston. | 04-18-2013 |
20140305299 | TELESCOPING FLUID PORTING TUBE - Provided is an electro-hydraulic control system ( | 10-16-2014 |