摘要:
A fluid control device provided with a plurality of switching valves and a plurality of relief valves, wherein a sub-relief passage communicating with a tank when the switching valves are in any state other than neutral is branched from a parallel passage for guiding a high-pressure hydraulic fluid to the switching valves, a sub-relief valve is provided within the sub-relief passage, and a check valve that minimizes the flow of hydraulic fluid toward a hydraulic pressure supply source is provided between switching valves and the point of branching of the sub-relief passage in the parallel passage, whereby the number of components and man-hours for assembly can be reduced due to the sub-relief passage having no check valve, hydraulic fluid can be prevented from heading toward a pump from an actuator even when the plurality of switching valves are operated simultaneously, and with no need for high hydraulic fluid pressure, high-pressure hydraulic fluid is prevented from being guided to an actuator having comparatively low pressure-resistant performance.
摘要:
A hydraulic circuit for lifting and lowering a load is disclosed. The hydraulic circuit may include a hydraulic pump, a fluid reservoir, a load-sense valve, and a hydraulic actuator having a first chamber and a second chamber. The hydraulic circuit may also include a first control valve assembly having first and second lowering positions, the valve being disposed between the hydraulic pump and the hydraulic actuator. A second control valve assembly may also be provided that is disposed between the first control valve assembly and the first chamber of the hydraulic actuator. In one embodiment, the second control valve assembly has a first position and a second position. In one embodiment, the load can be selectively lowered by the hydraulic circuit without use of the hydraulic pump when the first control valve assembly is in the first lowering position and the second control valve assembly is in the second position.
摘要:
A method of controlling a plurality of downhole tools in a wellbore, using first and second codes transmitted by hydraulic line to first address and then actuate the desired tool. A dedicated line is provided for terminating all actuated tools.
摘要:
Disclosed is a hydraulic control device for an agricultural implement; a progressive distribution mechanism is used to achieve a positive displacement, preferably a uniform movement of a plurality of hydraulic cylinders.
摘要:
A control system for varying cylinder valve timing of an internal combustion engine is provided. The control system includes a cam phase actuator having first and second actuator ports to adjust a rotational phase of a camshaft relative to a crankshaft, a first control valve, a second control valve, and a dynamic regeneration valve. In one embodiment, the dynamic regeneration valve is configured to enable the cam phase actuator to switch between operating in an oil pressure actuated mode and a cam torque actuated mode when adjusting the rotational phase of the camshaft relative to the crankshaft.
摘要:
A fluid storage reservoir (102) that creates a regenerative loop inside the reservoir to maintain a pressurized main suction chamber of the hydraulic fluid reservoir is provided. This reservoir includes two separate chambers (104, 106) which are operably fluidly connected by one or more check valves (120, 122). In the main suction chamber (104), the design arranges the return flow (Qr) larger than suction flow (Qs1) in order to pressurize this chamber. This pressure can be adjusted by the check valve setting (CV1). This regenerative reservoir can provide sufficient pressure when large system flow occurs.
摘要:
[Problem] To permit guiding oil of a high pressure in an oil passage section, which communicates a valve device and a filter to each other, to a relief valve by a relatively inexpensive structure even when clogging occurs in a filter arranged in an oil passage communicating the valve device and the relief valve to each other. [Solution] A hydraulic pump (20) and a charge valve (25), to which pressure oil is fed from the hydraulic pump (20) via an oil passage (26), are arranged. Arranged in the charge valve (25) are a valve device, for example, an on/off valve (33) switchable according to pressure oil delivered from the hydraulic pump (20), a relief valve (34) specifying a maximum of switching pressure for the on/off valve (33), and a filter (36) arranged in an oil passage (35) communicating the on/off valve (33) and the relief valve (34) to each other. In the oil passage (35), a check valve (37) is arranged in parallel with the filter (36) such that a flow of pressure oil from a side of the on/off valve (33) toward a side of the relief valve (34) is allowed but a flow of pressure oil from the side of the relief valve (34) toward the side of the on/off valve (33) is prevented.
摘要:
Hydraulikventil (1), umfassend ein erstes Ventil (2) und ein zweites Ventil (3), sowie eine Niederdruckleitung (4) und eine Hochdruckleitung (5), wobei das erste Ventil (2) einen ersten Ventilsitz (100) und einen zweiten Ventilsitz (200) aufweist, wobei der erste Ventilsitz (100) und der zweite Ventilsitz (200) durch ein erstes Verschlussteil (8) wechselweise verschließbar sind, sodass der jeweils geöffnete Ventilsitz (100, 200) des ersten Ventils (2) mit einer ersten Ausgangsleitung (6) hydraulisch verbunden ist, das zweite Ventil (3) einen dritten Ventilsitz (300) und einen vierten Ventilsitz (400) aufweist, wobei der dritte Ventilsitz (300) und der vierte Ventilsitz (400) durch ein zweites Verschlussteil (9) wechselweise verschließbar sind, sodass der jeweils geöffnete Ventilsitz (300, 400) des zweiten Ventils (3) mit einer zweiten Ausgangsleitung (7) hydraulisch verbunden ist, die Hochdruckleitungen (5) mit dem ersten Ventilsitz (100) und mit dem dritten Ventilsitz (300) verbunden ist, die Niederdruckleitung (4) mit dem zweiten Ventilsitz (200) und mit dem vierten Ventilsitz (400) verbunden ist, das zweite Verschlussteil (9) von einem Kolben (10) betätigbar ist, wobei der Kolben (10) eine Druckkammer (11) in einen ersten Kammerbereich (12) und in einen zweiten Kammerbereich (13) teilt, der erste Kammerbereich (12) mit der ersten Ausgangsleitung (6) verbunden ist, und der zweite Kammerbereich (13) mit dem vierten Ventilsitz (400) verbunden ist.