1)central valve,中心阀2)open center valve,开中心阀3)center control valve,中心控制阀4)centre spool valve,中心柱形阀5)steering valve center manifold,转向阀中心导管6)open centered valve,中立开口阀，开心式阀
用法例句
The paper expounds a technological demand for the hydraulic excavator's center control valve manufacturing modular machine tool in a hydraulic excavator plant,introduces the application of PLC in the center control system of the machine tool,and the outer circuit diagram and ladder diagram are given.
