Capacitive sensor based metering valve with displacement self-detection function

A capacitive sensor based metering valve with a displacement self-detection function comprises a valve body integrally in a column shape, a valve lining integrally in a cylinder shape, a movable poleplate and a displacement detection module, wherein a platform face is machined on the outer wall face of the valve body, and the side wall face is provided with a valve oil outlet valve port and a valve oil inlet valve port; the valve lining is lined outside the valve body, and a valve lining oil outlet valve port and a valve lining oil inlet valve port corresponding to the valve oil outlet valveport and the valve oil inlet valve port are arranged; the valve body slides in the valve lining in the axial direction, the relative position of the valve body and the valve lining is adjusted, the overlapped area of the valve oil inlet valve port and the valve lining oil inlet valve port and the overlapped area of the valve oil outlet valve port and the valve lining oil outlet valve port are controlled; the valve lining i