A load-sensing multi-way valve with a micro-movement spool

Abstract

The invention provides a load-sensitive multiway valve with a micromotion valve element. The load-sensitive multiway valve with the micromotion valve element comprises at least one valve body, wherein the valve body is provided with one group or multiple groups of valve blocks and an oil inlet hole; two ends of the valve body are respectively provided with a control end cover and a control piston end cover; each valve block comprises a main valve element hole, a micromotion valve element hole, a compensation valve element hole, an oil inlet path, a multiway valve oil inlet cavity, a plurality of oil outlet holes and oil leakage holes; a main valve element, a micromotion valve element and a compensation valve element are respectively installed in each main valve element hole, each micromotion valve element hole and each compensation valve element hole; each he oil inlet path is communicated with the corresponding oil inlet hole of the valve body and is communicated with a multiway valve oil inlet cavity via the corresponding compensation valve element hole; each multiway valve oil inlet cavities are communicated with the oil outlet holes and the oil leakage holes via the main valve element holes and the micromotion valve element holes. The load-sensitive multiway valve is provided with the micromotion valve elements, so that the load-sensitive multiway valve has the advantages of better multiway valve micromotion performance and convenience in the small-flow regulation of a system, system pressure loss is reduced, and an energy use ratio is improved. According to the load-sensitive multiway valve, the processing of a valve element throttling groove is reduced, and the difficulty of a processing technology is lowered.

Description

technical field [0001] The invention relates to a multi-way valve, in particular to a load-sensitive multi-way valve with a micro-motion valve core. Background technique [0002] With the continuous development of modern hydraulic technology and increasingly stringent site requirements, the field of construction machinery is developing in the direction of precision and stability. The hydraulic system using load-sensing technology reduces the number of speed-regulating valve components, has a high degree of integration, and can realize stepless adjustment of the speed of the system's actuators, widening the range of system flow adjustment, and the adjustment is accurate and the process is stable, making it in construction machinery. field has been widely used. [0003] In hydraulic systems, flow fine-tuning stages are often required to achieve precise and smooth positioning of system actuators. The hydraulic system multi-way valve with load-sensing characteristics accuratel...

AI Technical Summary

Problems solved by technology

Existing multi-way valves often control the flow characteristics of the system by opening a combined throttling groove on the valve core. This method has obvious shortcomings: the combined throttling groove increases the difficulty of the valve core processing technology, and the cost is high; throttling The groove makes the system pressure loss is large and the energy consumption is high

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