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Hydraulic system with back pressure control

A hydraulic system, hydraulic technology, applied in the general field of hydraulic systems

Active Publication Date: 2016-01-20
PARKER HANNIFIN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Previous hydraulic systems did not utilize backpressure control, or utilized backpressure control in the form of fixed or hydraulically controlled backpressure valves

Method used

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  • Hydraulic system with back pressure control
  • Hydraulic system with back pressure control
  • Hydraulic system with back pressure control

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Embodiment Construction

[0018] A hydraulic system including an electronically controlled backpressure valve that enables the backpressure in the return line of the system to be varied by a control unit. This system allows active control of the pressure in the return line to generate different back pressures for different situations. A higher return line pressure can be set to improve make-up or recirculation flow via the anti-cavitation valve. This can improve the controllability of functions that benefit from backpressure, such as shedding loads. Back pressure can be maintained high under these conditions to reduce pumping requirements, thereby improving productivity and / or reducing cavitation. In other cases, back pressure can be reduced to improve efficiency. The control unit controlling the backpressure valve may consider any of a wide variety of possible inputs when setting the backpressure valve. The setting of the backpressure valve (the pressure upstream of the backpressure valve in the re...

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PUM

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Abstract

A hydraulic system (10) comprising: an electronically controlled backpressure valve (60) such that the backpressure in the return line (36) of the system is varied via a control unit (64). This system allows active control of the pressure in the return line to generate different back pressures for different situations. A higher return line pressure can be set to improve makeup or recirculation flow through the anti-cavitation valve (50). This can improve the controllability of functions that benefit from backpressure, such as shedding loads (12). When setting the backpressure valve, the control unit used to control the backpressure valve may take into account any of a wide variety of possible inputs.

Description

technical field [0001] The present invention relates to the general field of hydraulic systems. Background technique [0002] Hydraulic systems are used for a wide variety of purposes. Given the ubiquity and variety of uses of hydraulic systems, improvements in the efficiency and / or performance of hydraulic systems would be desirable. [0003] Previous hydraulic systems did not utilize backpressure control, or utilized backpressure control in the form of fixed or hydraulically controlled backpressure valves. At best, these systems provide crude passive backpressure control. Contents of the invention [0004] According to an aspect of the invention, a hydraulic system includes an actively controlled backpressure control valve. [0005] According to another aspect of the invention, a hydraulic system includes an electronically controlled backpressure control valve. [0006] According to yet another aspect of the present invention, a hydraulic system includes: a control v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B21/08
CPCF15B11/00F15B2211/3127F15B2211/3144F15B2211/50518F15B2211/50545F15B2211/5156F15B2211/6306F15B2211/632F15B2211/6336F15B2211/6346Y10T137/86027Y10T137/7837F15B15/18
Inventor 罗杰·洛曼吉尔马诺·弗兰佐尼加尔默·哈希亚
Owner PARKER HANNIFIN CORP