Computer monitors and ultrasonic detectors for evaluating the functioning and flow control of valves in pipelines, steam pipelines and steam plants and for detecting steam leakage therein; monitoring systems consisting of a sight glass for checking the functioning and flow control of valves in pipelines, steam pipelines and steam plants and for detecting steam leakage therein; computer monitors for detecting contamination in liquids and gases in pipelines, steam pipelines or steam plants, aut...