Hydraulic lift valve manifold blocks, its characteristics, including the first two electromagnetic directional valve, the second two-way electromagnetic directional valve and a relief valve, a one-way valve and a pressure feedback flow unloading valve, the hydraulic pump described in turn connect export flow unloading valve, pressure feedback DiYiLiangWei two-way solenoid directional control valve, check valve and cylinder; The pressure feedback flow unloading valve is also connected with an overflow valve; The oil cylinder supports the heavy object and is connected with the second two two-way electromagnetic reversing valve; Described flow unloading valve, relief valve, pressure feedback no.2 two position two-way electromagnetic directional valve connection tank respectively, two two two-way electromagnetic directional valve when electricity oil, oil, when power off when DiYiLiangWei two-way electromagnetic directional valve when electricity no.2 two position two-way power electromagnetic directional valve, when no.2 r two position two-way electromagnetic directional valve when electricity no.1 two position two-way power electromagnetic directional valve; When no.1 two postion two-way power electromagnetic directional valve, no.2 two position two-way electromagnetic directional valve electricity, no.1 two position two-way electromagnetic directional valve oil, hydraulic oil by pressure feedback flow of unloading valve feedback control inflow pressure feedback flow of unloading valve left right side push the slide valve core, make the hydraulic oil into the hydraulic oil tank so as to achieve the unloading.
Pressure switch
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