Patent ID: 6763703
Filing Date: 2004-07-20
Classification: G01M

Abstract:
A method for determining at the seal of a valve or a valve rod leaks of a working medium being controlled by said valve, comprising:determining in a control volume between a first valve-rod seal and a second valve-rod seal, if appropriate as a function of time, the pressure of the working medium controlled by the valve that leaks into said control volume from outside said control volume through one of said first and said second valve-rod seals; using the determined pressure to calculate the leak flow rate of said working medium leaking into said control volume; using the value obtained for the leak flow rate to draw conclusions as to whether the seal is sealed, and in this way a seal replacement time is determined; and measuring, after the control volume is discontinuously opened or emptied and then closed again, the pressure rise of the working medium controlled by the valve that leaks into the control volume.