Abstract: A hydraulic system for the pitch angle adjustment of a rotor blade of a wind turbine) includes a variable displacement pump, a hydraulic accumulator, a dynamic valve, a control valve, a tank and a pitch cylinder. The variable displacement pump is connected to the control valve via a first connecting line and the control valve is connected to the tank via a second connecting line and to a piston side of the pitch cylinder via a third connecting line and to a rod side of the pitch cylinder via a fourth connecting line. In a first switching position, the first connecting line is connected to the third connecting line and in a second switching position, the first connecting line is connected to the fourth connecting line and the second connecting line is connected to the third connecting line.

Abstract: A valve section includes a pressure channel, a load pressure signaling channel, a compound load pressure channel, a spool valve, a pressure compensator, a first and a second hydraulic connection and a first line connecting the pressure channel to the spool valve. The pressure compensator is disposed in the first line. A first pressure signal via a first pilot control line and a third pressure signal are applied to the pressure compensator on the closing side. A second pressure signal via a second pilot control line and a fourth pressure signal are applied to the pressure compensator on the opening side. A fifth pilot control line branches off between the pressure compensator and the spool valve and is connected to the second pilot control line. A first hydraulic resistor is disposed in the fifth pilot control line and a second hydraulic resistor is disposed in the second pilot control line.

Abstract: A hydraulic system is provided for supplying at least one hydraulic consumer with at least one supply pump, a consumer connection, a return connection, a cooling circuit and a tank. The at least one cooling circuit comprises a cooling pump, a circulation cooling line connected to the tank and a heat exchanger. The cooling pump and the heat exchanger are disposed in the circulation cooling line. Downstream of the cooling pump and upstream of the heat exchanger, a branch line connected to the consumer connection branches off from the circulation cooling line and the cooling circuit comprises a switching valve. The switching valve can be switched between a closed position and an open position, wherein the circulation cooling line is closed in the closed position, so that the cooling pump is only connected to the branch line. In the open position, the cooling pump is connected to the heat exchanger.

Abstract: A hydraulic valve assembly includes a connection section, a first valve section, at least one second valve section, and a hydraulic pilot control device with a pilot valve device. The first valve section has a first spool piston and a first spool diverter. The second valve section has a second spool piston and a second spool diverter. The first spool diverter and the second spool diverter are each switchable to at least a first spool diverter switching position and a second spool diverter switching position. Pilot pressure is applied in parallel to the first spool diverter and the second spool diverter via the hydraulic pilot control device in a first switching position of the pilot valve device for switching together into the first spool diverter switching position.

Abstract: The present invention relates to a hydraulic valve assembly (10) with a connection block (12) and at least one valve section (14.1 . . . 14.n), wherein the hydraulic valve assembly (10) comprises a main electronics holder (16) with a main electronics module (18) disposed therein, and wherein the valve section (14.1 . . . 14.n) comprises a valve section electronics holder (20.1 . . . 20.n) with a valve section electronics module (22.1 . . . 22.

Abstract: A hydraulic valve bank has at least two valve sections, a connection section, and a pressure channel for pressurizing the valve sections. The pressure channel connects the connection section to each valve section for pressurizing them. Each valve section has a spool, an electrohydraulic pilot control for actuating the spool and an upstream pressure compensator. The valve bank is a load-sensing system and has a load pressure collecting channel for signaling the highest load pressure. A common pilot pressure signal is applied to the electrohydraulic pilot control of each valve section via the connection section. A single pilot control pressure influencing valve changes the common pilot pressure signal, and is connected to the pressure channel to be acted upon in a first switching direction, and to the load pressure collecting channel to be acted upon in a second switching direction. A mobile hydraulic system includes such a hydraulic valve bank.

Abstract: A hydraulic system for the pitch angle adjustment of a rotor blade of a wind turbine) includes a variable displacement pump, a hydraulic accumulator, a dynamic valve, a control valve, a tank and a pitch cylinder. The variable displacement pump is connected to the control valve via a first connecting line and the control valve is connected to the tank via a second connecting line and to a piston side of the pitch cylinder via a third connecting line and to a rod side of the pitch cylinder via a fourth connecting line. In a first switching position, the first connecting line is connected to the third connecting line and in a second switching position, the first connecting line is connected to the fourth connecting line and the second connecting line is connected to the third connecting line.

Abstract: A hydraulic system for a rotor brake of a wind turbine, where the hydraulic system has a pressure chamber, a manually operable pump device and a connection for connection to the rotor brake. The manually operable pump device is connected to the pressure chamber and the connection. The manually operable pump device comprises a coupling section for actuation. The coupling section is configured to be connected to an external device.

Abstract: An additional hydraulic device for a pitch system of a wind turbine, the additional hydraulic device including a hydraulic motor, a hydraulic accumulator for storing hydraulic energy, a valve unit, a return line and a reservoir. The return line is connected to the reservoir. The valve unit is switchable to a drive switching position, and the hydraulic motor is connected to the hydraulic accumulator in the drive switching position. The energy stored in the hydraulic accumulator drives the hydraulic motor in the drive switching position so that the hydraulic motor delivers an additional force component.

Abstract: A hydraulic valve bank has at least two valve sections, a connection section, and a pressure channel for pressurizing the valve sections. The pressure channel connects the connection section to each valve section for pressurizing them. Each valve section has a spool, an electrohydraulic pilot control for actuating the spool and an upstream pressure compensator. The valve bank is a load-sensing system and has a load pressure collecting channel for signaling the highest load pressure. A common pilot pressure signal is applied to the electrohydraulic pilot control of each valve section via the connection section. A single pilot control pressure influencing valve changes the common pilot pressure signal, and is connected to the pressure channel to be acted upon in a first switching direction, and to the load pressure collecting channel to be acted upon in a second switching direction. A mobile hydraulic system includes such a hydraulic valve bank.

Abstract: A hydraulic valve assembly includes a connection section, a first valve section and a pressure line. The first valve section has a first spool piston, a first spool diverter, at least one first consumer port and at least one second consumer port. The first spool diverter can be switched at least into a first spool diverter switching position and a second spool diverter switching position. A shut-off valve is disposed in the pressure line and blocks the pressure line in a blocking position and can be switched from the blocking position into a first release switching position and a second release switching position. The shut-off valve switches into the first release switching position when the first spool diverter is in the first spool diverter switching position and into the second release switching position when the first spool diverter is in the second spool diverter switching position.

Abstract: A valve section for a hydraulic system includes at least a first hydraulic port and a second hydraulic port, a spool, a pressure channel, a collector channel, an inlet pressure compensator disposed between the pressure channel and the spool, and an outlet pressure compensator disposed between the spool and the collector channel. The spool selectively connects the first hydraulic port to the pressure channel and the second hydraulic port to the collector channel or connects the first hydraulic port to the collector channel and the second hydraulic port to the pressure channel. The inlet pressure compensator and the outlet pressure compensator are controllable via a signal pressure device. An external additional force component dependent on an operating state of the hydraulic system acts on the hydraulic port connected to the collector channel on the signal pressure device such that the inlet pressure compensator blocks the pressure channel.

Abstract: A hydraulic valve assembly includes a connection section, a first valve section, at least one second valve section, and a hydraulic pilot control device with a pilot valve device. The first valve section has a first spool piston and a first spool diverter. The second valve section has a second spool piston and a second spool diverter. The first spool diverter and the second spool diverter are each switchable to at least a first spool diverter switching position and a second spool diverter switching position. Pilot pressure is applied in parallel to the first spool diverter and the second spool diverter via the hydraulic pilot control device in a first switching position of the pilot valve device for switching together into the first spool diverter switching position.

Abstract: A hydraulic valve assembly includes a connection section, a first valve section and a pressure line. The first valve section has a first spool piston, a first spool diverter, at least one first consumer port and at least one second consumer port. The first spool diverter can be switched at least into a first spool diverter switching position and a second spool diverter switching position. A shut-off valve is disposed in the pressure line and blocks the pressure line in a blocking position and can be switched from the blocking position into a first release switching position and a second release switching position. The shut-off valve switches into the first release switching position when the first spool diverter is in the first spool diverter switching position and into the second release switching position when the first spool diverter is in the second spool diverter switching position.

Abstract: A preselection valve is for a hydraulic valve assembly with a switching element, a pressure input line, a first pressure output line and a first load pressure line with a load pressure inlet and output. The switching element is switchable from neutral to a first switching position. The pressure input line is connected to the first pressure output line in the first position. The preselection valve has a second and third load pressure line and a load pressure increasing device. The second load pressure line branches off the pressure input line upstream of the switching element. The load pressure increasing device is connected to the third load pressure line, which connects the pressure increasing device to the first load pressure line. The second load pressure line is connected to the pressure increasing device in the first switching position and the second load pressure line is blocked in the neutral position.

Abstract: A preselection valve is for a hydraulic valve assembly with a switching element, a pressure input line, a first pressure output line and a first load pressure line with a load pressure inlet and output. The switching element is switchable from neutral to a first switching position. The pressure input line is connected to the first pressure output line in the first position. The preselection valve has a second and third load pressure line and a load pressure increasing device. The second load pressure line branches off the pressure input line upstream of the switching element. The load pressure increasing device is connected to the third load pressure line, which connects the pressure increasing device to the first load pressure line. The second load pressure line is connected to the pressure increasing device in the first switching position and the second load pressure line is blocked in the neutral position.

Abstract: A proportional hydraulic valve has a valve housing, an actuating device and a valve piston axially movable in a piston chamber of the valve housing. The valve housing has at least one pressure connection and at least one connection port. The valve piston blocks a flow path between the pressure connection and the connection port or releases it proportionally by moving the valve piston proportionally to an actuating force generated by the actuating device between a closed position and an open position. The valve piston has a first and a second spool area with a circumferential recess in the axial direction after the first and before the second spool area. The recess together with the piston chamber forms a pressure chamber and the pressure connection opens into the pressure chamber. A first diameter of the first spool area is larger than a second diameter of the second spool area.

Abstract: A hydraulic valve assembly includes a first spool valve and a first selector valve for actuating a first hydraulic consumer port or a second hydraulic consumer port, and a second spool valve and a second selector valve for actuating a third hydraulic consumer port or a fourth hydraulic consumer port. A shut-off valve is arranged in a common pressure channel. A branch channel with first and second pressure branch channels branches off the pressure channel upstream of the shut-off valve. The first selector valve connects the first pressure branch channel to a first connection line in a first switching position and connects the second pressure branch channel to a second connection line in a second switching position. The second selector valve, in a first switching position, connects the first connection line to the control channel and, in a second switching position, connects the second connection line to the control channel.

Abstract: A proportional hydraulic valve has a valve housing, an actuating device and a valve piston axially movable in a piston chamber of the valve housing. The valve housing has at least one pressure connection and at least one connection port. The valve piston blocks a flow path between the pressure connection and the connection port or releases it proportionally by moving the valve piston proportionally to an actuating force generated by the actuating device between a closed position and an open position. The valve piston has a first and a second spool area with a circumferential recess in the axial direction after the first and before the second spool area. The recess together with the piston chamber forms a pressure chamber and the pressure connection opens into the pressure chamber. A first diameter of the first spool area is larger than a second diameter of the second spool area.

Abstract: The present disclosure provides, in a first aspect, a pressure-controlled 2-way flow control valve for hydraulic applications, wherein the 2-way flow control valve has applied thereto a first pressure signal in the closing direction of the 2-way flow control valve by means of a first output-side tapping and a second pressure signal in the opening direction by means of an LS pressure reporting duct. A pressure signal corrupting the first or second pressure signal is applied to the 2-way flow control valve in the closing or opening direction by means of a second tapping which is effective at least over part of the control stroke of the 2-way flow control valve.