Method for Valve Height Measurements

摘要

The research report concerns a method (developed earlier) to determine the position of a valve in a single action piston pump. The method uses a transducer with three magnetoresistive sensors (which detect magnetic field variations) and a valve with a built in permanent ring magnet. It was found that the valve's center height was linearly proportional to the sensors' average output voltage. Tests show that the height can be approximated using this linearity. Two ASYST programs were written for measurement of the valve's height and for calibration. With these programs a number of dynamic height measurements were performed: drop tests, the results of which agree with theory, and measurements of valve height during a pump stroke.