Load maintaining valve

A technology of load holding valve and holding valve, applied in the field of hydraulic valves, which can solve the problems of low pressure loss of balance valves, unadjustable oil pipes or shutting down flow of oil cylinders, etc., to achieve stable and reliable performance

Inactive Publication Date: 2016-05-18
SHANGHAI LIXIN HYDRAULIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing balance valve cannot provide low pressure loss when loading, cannot use fine flow control

Method used

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Embodiment Construction

[0035] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0036] For the load holding valve in this solution, by opening two one-way valve ports, the load chamber is pressurized and the load is pushed, so that the pressure caused by the load acts on the one-way valve core and pushes it to the main valve core. Therefore, the oil is blocked in the oil cylinder and becomes a non-leakage state; when it is necessary to unload, the main valve core is pushed away from the one-way valve core by a sufficiently high control pressure.

[0037] At the same time, the load holding valve also has a plug-in safety valve, which can be opened when overload or vibration occurs, so that the load can be unloaded without controlling oil when overload or vibration occurs.

[0038] In addition, in actual implementation, the v...

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PUM

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Abstract

The invention discloses a load maintaining valve. The load maintaining valve comprises a valve body and a balance adjustment assembly arranged in the valve body. Two inner cavity main holes are formed in the valve body. A load cavity is pressurized by opening two one-way valve ports of the load maintaining valve, and a load is pushed. The pressure caused by the load acts on a one-way valve element in the balance adjustment assembly, and the one-way valve element is pushed towards a main valve element in the balance adjustment assembly, so that oil is sealed in an oil cylinder, and a leak-free state is achieved. When unloading is required, the main valve element is pushed away from the one-way valve element by generating control pressure which is high enough. Compared with a traditional balance valve, the load maintaining valve has the most outstanding characteristics that the load maintaining valve is not affected by the back pressure of an oil return path, and the performance is stable and reliable.

Description

technical field [0001] The invention relates to a hydraulic valve, in particular to a load holding valve. Background technique [0002] The load holding valve is a common balancing valve in hydraulic valves, and it is widely used in construction machinery, metallurgical industry, etc. The load is loaded by one-way, and the spool is closed quickly without control oil in the reverse direction, and unloaded by control oil. [0003] However, the existing balance valve cannot provide low pressure loss when loading, cannot use fine flow control to ensure micro-motion performance, and cannot adjust or close the lowering flow of the oil cylinder when the oil pipe bursts. [0004] Therefore, it is an urgent problem in this field to provide a new balance valve to overcome the defects of the existing balance valve. Contents of the invention [0005] In view of the above problems existing in the existing balance valve, the object of the present invention is to provide a load holding...

Claims

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Application Information

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IPC IPC(8): F15B13/02
Inventor 叶正森徐晋易朱剑根高建中何俊翟俊华
Owner SHANGHAI LIXIN HYDRAULIC
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