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control valve assembly

A technology for controlling valves and components, used in servo motors, thin material handling, servo meter circuits, etc., to solve problems such as limited or compromised functions of upstream components due to increased back pressure

Active Publication Date: 2017-05-10
斗山山猫北美公司
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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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PUM

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Abstract

A power machine (100) and a power conversion system (106) for the power machine are disclosed. In an example embodiment, a power conversion system includes: a pump (206) configured to provide a source of pressurized hydraulic fluid; and a control valve assembly (204, 300) to receive the hydraulic fluid. The control valve assembly includes a first valve element (308) configured to direct hydraulic fluid to an actuator (314) when the first valve element is in first and second actuated positions (342, 346). The control valve assembly also includes a second valve element (310) downstream of the first valve element. The first valve element is movable between a non-actuated position (344) and first and second actuated positions, and is configured to direct hydraulic fluid received from the actuator to the second valve through the second actuated position element, and 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 Patents(China)
IPC IPC(8): F15B11/16
CPCF15B11/16F15B2211/3122Y10T137/87185Y10T137/87177F15B2211/3133F15B2211/31588F15B2211/88
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 斗山山猫北美公司