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Hydraulic system and pressure limiting valve

A hydraulic system and pressure limiting valve technology, applied in the field of hydraulic systems, can solve the problems of increasing the complexity of the switch structure, installation space, manufacturing cost, and pressure accumulation, so as to improve the pressure accumulation function, minimize production or manufacturing costs, and reduce quantity Effect

Inactive Publication Date: 2013-12-18
LIEBHERR FRANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, a disadvantage of the known designs described above is that separate valves must always be used for the maximum pressure limitation, pressure build-up and bypass functions
This increases the complexity of the switch structure and leads to the necessary installation space and manufacturing costs

Method used

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  • Hydraulic system and pressure limiting valve
  • Hydraulic system and pressure limiting valve
  • Hydraulic system and pressure limiting valve

Examples

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Embodiment Construction

[0033] figure 1 A schematic diagram of a hydraulic circuit according to the prior art is shown. Via the hydraulic pump 1 , three hydraulic consumers 2 , 3 , 4 are fed, which are controlled jointly or each individually via at least one 4 / 3-way valve as main control valve. The system pressure in line 5 is controlled via the delivery rate of pump 1 and the switching position of a directional valve, not shown. For the sake of safety, a pressure limiting valve 6 is set. When the system pressure exceeds the maximum limit pressure, the pressure limiting valve is switched and the volume flows into the tank.

[0034] The system pressure in line 5 is additionally controlled via a pressure accumulation valve 7 . In order to achieve the desired target pressure inside line 5, valve 7 partially closes the flow to the tank. Such as figure 1 The hydraulic circuit shown uses separate valves 6, 7 for two functions, namely for maximum pressure limitation and pressure buildup. Possible valve...

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PUM

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Abstract

A hydraulic system has at least one consumer and at least one hydraulic pump. A pressure limiting valve for limiting the maximum system pressure is connected with the at least one hydraulic pump, and the pressure limiting valve is pilot-controlled for switching a bypass. The invention also concerns a pressure limiting valve for limiting the system pressure inside such a hydraulic system.

Description

technical field [0001] The invention relates to a hydraulic system with at least one consumer and at least one hydraulic pump, wherein a pressure limiting valve for limiting the maximum system pressure is connected to the at least one hydraulic pump. Background technique [0002] Hydraulic circuits and their hydraulic components are designed for a definable maximum system pressure. Exceeding the maximum system pressure may result in damage to the circuits and components used. For this reason, a pressure limiting valve is provided, which directs the output flow of the hydraulic pump to the hydraulic tank if the existing system pressure exceeds the maximum pressure limit value. [0003] As an additional safety measure, bypass closure via an additional valve is usually required. By actuating the valve provided, the output flow of the hydraulic pump is circulated directly into the hydraulic tank, whereupon the system pressure will drop. [0004] Furthermore, depending on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B20/00F15B13/02
CPCF15B11/0423F15B2211/50518F15B2211/50536F15B2211/5157F04B49/035
Inventor 弗兰克·赫尔布林西蒙·哈佩尔克里斯托弗·米勒
Owner LIEBHERR FRANCE