Multipath valve and engineering machinery
2012
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.
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