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Control valve assembly

A technology for controlling valves and components, applied in servo motors, thin material processing, servo meter circuits, etc., can solve problems such as limited or compromised functions of upstream components when back pressure rises

Active Publication Date: 2015-01-07
CLARK EQUIP CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It is known that in some open center hydraulic control valve assemblies, when a downstream valve element is actuated to provide fluid to a downstream actuator, backpressure may rise to the point where the functionality of the upstream element is limited or compromised

Method used

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Embodiment Construction

[0012] The concepts disclosed herein are not limited in their application to the details of construction and arrangement of components set forth in the following description or illustrated in the following drawings. That is, the embodiments disclosed herein are illustrative in nature. The concepts illustrated in these embodiments can be practiced or carried out in a variety of ways. Phrases and terms used herein are for the purpose of description and should not be regarded as limiting. As used herein, words such as "comprises," "comprising," and "having" and variations thereof are meant to encompass the terms listed thereafter and equivalents thereof as well as additional terms. Unless otherwise specified or limited, the terms "mount," "connect," "support," and "couple" and variations thereof are used broadly and encompass direct and indirect mounting, connecting, supporting, and coupling. Furthermore, "connected" and "coupled" are not limited to physical or mechanical conne...

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Abstract

A power machine and a power conversion system for a power machine are disclosed. In an exemplary embodiment, the power conversion system includes a pump configured to provide a source of pressurized hydraulic fluid and a control valve assembly to receive the hydraulic fluid. The control valve assembly includes a first valve element configured to direct hydraulic fluid to an actuator when the first valve element is in first and second actuated positions. The control valve assembly also includes a second valve element downstream of the first spool. The first valve element is moveable between an unactuated position and the first and second actuated positions and is configured to direct hydraulic fluid received from the actuator through the second actuated position to the second valve element and to direct hydraulic fluid received from the actuator through the first actuated position to bypass the second valve element.

Description

technical field [0001] The disclosed embodiments relate to power machines employing a control valve assembly to control hydraulic fluid flow to various actuators operatively coupled to the control valve assembly. Background technique [0002] Some power machines, including skid steer loaders, track loaders, steered axle loaders, excavators, telehandlers, rear travel loaders, trenchers, etc., use engine-powered hydraulic power conversion systems. In some power machines, hydraulic power transfer systems use an open center series control valve assembly that receives pressurized fluid from a pump. The control valve assembly typically has multiple valve elements to discharge hydraulic fluid to different work functions of the power machine. For example, where there is a lift cylinder for raising and lowering the boom, a swing cylinder for controlling the tilt position of the machine frame and thus the tilt position of the suspended machine relative to the boom, and one or more ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B11/16
CPCF15B2211/3122F15B11/16Y10T137/87185Y10T137/87177F15B2211/3133F15B2211/31588F15B2211/88
Inventor 詹森·R·库姆斯约瑟夫·A·圣奥宾乔纳森·J·拉克尔罗德尼·科赫
Owner CLARK EQUIP CO INC