Direct-acting load control valve with integrated relief function in the main spool

Abstract

The invention discloses a direct-acting type load control valve used for integrating an overflowing function into a main valve core. The valve comprises a spiral block, a control piston, a push rod, a valve sleeve spring, the main valve core, a valve sleeve, a control valve left end cover, a control valve spring, a control valve core, a control valve body, a control valve push rod, a control valve push rod spring, a valve body, an overflowing ball valve core, an overflowing piston, a main valve spring, a main valve spring sleeve and a pretightening force adjusting bolt. According to the invention, a control oil circuit is simplified and is integrated into a control module, so that the processing technological requirement of the control oil circuit is reduced; the control oil circuit is improved from the principle, so that the pilot ratio is improved, and the control pressure required when a load is released is reduced; the overflowing function which is completed by a single valve core is integrated into the main valve core to reduce the number of valve parts, the size of the valve body is smaller, and the structure is more compact.

Description

technical field [0001] The invention relates to a hydraulic control element, in particular to a direct-acting load control valve with an overflow function integrated into a main valve core. Background technique [0002] The load control valve, also known as the balance valve, is a hydraulic valve specially designed to control the flow of hydraulic oil back to the oil source under negative load conditions. Negative load or overrunning load refers to the situation that the direction of the load force is the same as the direction of the load movement, which often occurs in engineering hydraulics and travel hydraulic systems. In addition, this kind of hydraulic valve usually needs to have an overflow function to ensure that the hydraulic actuator is not damaged by high pressure. [0003] The flow of the load control valve needs to be controlled by the control oil circuit of the load control valve under the overload condition. When it is applied to a high-pressure system, in ord...

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Problems solved by technology

[0006] In order to overcome the shortcomings of many parts, complex structure and high control pressure requirements in the traditional direct-acting load control valve in the background technology, the purpose of the present invention is to provide a direct-acting load control valve that integrates the overflow function into the main valve core. Load control valve, a direct-acting load control valve that simplifies the control network, integrates the function of the check valve into the valve sleeve, and integrates the overflow function into the main spool. This valve has carried out the structure and principle of the control network in the traditional load control valve Improvements in the field, increase the pilot ratio, integrate the overflow function completed by a separate spool on the main spool, reduce the number of valve parts, make the valve smaller in size and more compact in structure

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