Preview....To view the entire video go to http://www.cteskills.com/ Control Valves Pressure Relief Valves (Preview) An introduction to control valves. In this video we cover the uses and functioning parts of control valves. http://www.cteskills.com/ Control Valve An introduction to the different types of control valves. The basic function of control valves. Basic operation of control valves. Working parts of control valves.