SYSTEM FOR COMPENSATING FOR A DIMENSIONAL CHANGE OF A CONTROL FITTING, WHICH DIMENSIONAL CHANGE ACCOMPANIES THERMAL LOADING, POSITION REGULATING SYSTEM, METHOD FOR COMPENSATING FOR A DIMENSIONAL CHANGE OF A CONTROL FITTING, WHICH DIMENSIONAL CHANGE ACCOMPANIES THERMAL LOADING, AND CONTROL FITTING

摘要

The present invention relates to a system for compensating for a dimensional change of a control fitting, which dimensional change accompanies thermal loading, for setting a process fluid stream of a process plant, such as a chemical plant, a food processing plant, a power plant or the like, wherein the control fitting has a control valve and an actuating drive which drives the control valve, in particular pneumatically, wherein the system determines an actuating travel correction for the actuating drive on the basis of a temperature difference between a process temperature, such as the process fluid temperature, and an ambient temperature, such as an actuating drive temperature.