METHOD FOR DETERMINING A STATE VARIABLE OF A VALVE DIAPHRAGM OF AN ELECTRONICALLY CONTROLLED AND MOTOR-DRIVEN DIAPHRAGM VALVE, AND DIAPHRAGM VALVE SYSTEM

摘要

A method for determining a state variable (Δ1) of a valve diaphragm (20) of a motor-driven diaphragm valve (10) comprises the following steps: a) in a first time range: moving the valve diaphragm (20) in such a way that the diaphragm valve (10) changes from a first state into a second state; in the process b) detecting at least one reference value of a variable which is associated with the movement process of the valve diaphragm (20); c) in a second time range: moving the valve diaphragm (20) in such the way that the diaphragm valve (10) changes from the first state into the second state; in the process d) detecting at least one operating value of the variable which is associated with the movement process of the valve diaphragm (20); e) comparing the at least one reference value with the at least one operating value or variables acquired therefrom; and f) determining the state variable from the result of the comparison.