Patent ID: 8443821
Filing Date: 2013-05-21
Classification: F16K,G05B,Y10T

Abstract:
1. A method for sensor operating-state determination of a valve arrangement to control a process medium flow through a pipeline, a valve element being arranged to move axially within a valve housing via a pneumatic actuating drive by application of control pressure, with the control pressure being measured and evaluated to determine sliding friction of the valve element during movement, the method comprising: moving the valve element at a constant speed over at least a subarea of the travel movement; measuring a value of speed via a position sensor system for signal processing; measuring an applied control pressure at approximately a same time as the measuring of speed for signal processing via a pressure sensor system; and determining a current sliding friction of the valve element as a measure of wear state from the measured speed and control pressure values using an electronic evaluation unit and a proportional drive force expressed as control pressure which occurs when the valve element is traveling at a constant speed.