Multipath valve and engineering machinery

Abstract

The invention relates to the technical field of engineering machinery, and discloses a multipath valve and engineering machinery. The multipath valve comprises a main valve group, wherein the main valve group comprises a first main reversing valve, a second main reversing valve, a first differential pressure valve, a second differential pressure valve, a first switching valve, a second switching valve, a third switching valve, a first pressure selection valve, a second pressure selection valve, a third pressure selection valve, a first oil inlet path, a second oil inlet path, an oil returning path, a first feedback oil path and a second feedback oil path. By the multipath valve, shunting flow and convergence flow of double pumps can be controlled, so that composite action and single action of at least two working execution elements can be realized. Compared with the prior art, the multipath valve has the advantages that energy loss is reduced; furthermore, during shunting and convergence, before and after differential pressure of each main reversing valve is kept constant; and influence of load change on flow control of each main reversing valve is avoided.

Description

technical field [0001] The invention relates to the technical field of construction machinery, in particular to a multi-way valve and construction machinery. Background technique [0002] A multi-way valve is a combination of more than two valve blocks to manipulate the movement of multiple actuators. Multi-way valves are mostly used in construction machinery. Construction machinery generally has multiple actions, but due to the different loads of each action, more than one action can be realized at the same time, and the effect is poor. [0003] In the prior art, in order to solve the above shortcomings, a pressure compensation valve is generally installed at the inlet of each reversing valve of the combined multi-way valve. The principle is to achieve the pressure balance of each action by increasing throttling and damping. But its disadvantage is that when the construction machinery performs compound actions, the pressure difference at both ends of the pressure compensat...

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Problems solved by technology

But its disadvantage is that when the construction machinery performs compound actions, the pressure difference at both ends of the pressure compensation valve connected to the smaller load will be converted into heat energy, which will cause the temperature of the system to rise, which will not only cause energy waste, but also affect the hydraulic components. Use, this situation is more prominent when the load difference is large

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