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Valve control valve circuit for operating a single acting hydraulic cylinder

一种液压缸、方向控制阀的技术，应用在液压系统领域，能够解决泄漏大、工具位置偏移等问题

Inactive Publication Date: 2012-07-18
HUSCO INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Over this length of time, the total leakage that occurs in a spool type valve can be large enough to produce a significant shift in the position of the tool

Method used

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  • Valve control valve circuit for operating a single acting hydraulic cylinder
  • Valve control valve circuit for operating a single acting hydraulic cylinder
  • Valve control valve circuit for operating a single acting hydraulic cylinder

Examples

Experimental program
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Embodiment Construction

[0018] definition

[0019] The term "directly connected" means that associated parts are joined together by a conduit without any intervening elements such as valves, holes or other devices that restrict or control the flow of fluid outside the inherent limitations of any conduit .

[0020] As used herein, the term "hydraulic cylinder" generally refers to a hydraulic actuator comprising a cylinder in which a piston moves in response to hydraulic fluid being supplied to or expelled from the cylinder, and, In this cylinder, a piston rod is connected to a piston so as to extend from or be retracted into the cylinder as the piston moves.

[0021] The term "selective check valve" refers to a valve that has two selectable states in which fluid can flow through the valve in one direction only, while the other state allows free flow in the opposite direction . Selective check valves may include, for example, pilot operated check valves or dual state electrohydraulic valves.

[002...

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PUM

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Abstract

Provided is a valve control valve circuit for operating a single acting hydraulic cylinder. A system for operating a single acting hydraulic cylinder includes a directional valve that has one extreme position in which a workport is connected to a tank return conduit, another extreme position where the workport is connected to a pump supply conduit, and a closed intermediate a position where the workport is disconnected from both the pump and the tank. The directional valve is pilot operated and is biased toward the one extreme position by a spring. An electrically operated primary pilot valve applies pilot pressure to the directional valve alternately from the pump supply conduit and the tank return conduit. A pilot operated check valve has a first state which restricts fluid flow only from the workport toward the chamber and a second state in which fluid can flows from the chamber to the workport. The system has a pressure compensation that also provides self priming of the directional valve.

Description

technical field [0001] The present invention relates to hydraulic systems having single-acting hydraulic cylinders, and more particularly to arrangements of valves for controlling the operation of such hydraulic cylinders. Background technique [0002] A variety of agricultural implements can be used to be pulled by a tractor and used to work the soil in a field where crops are to be planted or where crops have already been planted. The implement is attached to a standard three-point hitch on the rear of the tractor and the hitch can be hydraulically operated to raise and lower the implement. [0003] To raise and lower the tractor hitch, the operator operates the manual interface in a manner that indicates the desired direction and speed of hitch movement. The manual interface sends an electrical signal to the controller, which then applies electrical current to the solenoid-operated directional control valve. The directional control valve either sends pressurized fluid t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B13/02F15B21/08
CPCF15B2211/7128F15B2211/45F15B11/08F15B2211/41563F15B2211/329A01B63/1006F15B2211/50518F15B2211/7052F15B2211/30505Y10T137/7762F15B1/033
Inventor J·格林伍德M·J·雷兹D·J·斯凯杰克
Owner HUSCO INT INC