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叠加阀油路块内油路复杂，设计中的差错很多，文中对叠加阀油路块的设计作了总结，为设计中减少差错提供了理论依据。
The complicated oil passages in the overlay valve block have many errors in the design. The design of the overlay valve block is summarized in this paper, which provides a theoretical basis for reducing errors in the design.