Distance detection system for use in determining position of valve piston, has permanent magnet which is connected to valve piston and set movable along core rod that is connected to sensor housing

摘要

A core rod (4) is connected to a sensor housing (1) to produce an electrical signal corresponding to the position of a valve piston (9) based on the relative motion between the core rod and a magnetic field generating device. The magnetic field generating device has a permanent magnet (11) connected to the valve piston and movable along core rod.