Method for diagnosing a process valve assembly and diagnostic device

Abstract

A method for the diagnosis, in particular for the leakage recognition, of a process valve assembly unit, said process valve assembly unit including a control device (4), a valve drive (3) which is pneumatically controlled by the control device (4) and a process valve (1) which is driven by the valve drive (4), wherein the method includes the following steps which are carried out by a diagnosis device (50): determining that a diagnosis system state which is suitable for the diagnosis is present after the completion of an actuation of the process valve assembly unit (20), acquiring a temporal course of a measured variable, in particular a pressure, during the diagnosis system state, and on the basis of the acquired temporal course, determining diagnosis information which indicates a diagnosis result, in particular a presence of a leakage, of the process valve assembly unit (20).

Dependencies are inferred from the claim text.