CCPS 7-Minute Seminar Series Share This Post: Related Topics: Workforce InvolvementSafe Work PracticesVenting & Emergency ReliefJanuary 16, 2014A pressure relief valve is a type of valve used to control or limit the pressure in a system. It is generally considered your last line of defense in an overpressured situation. Watch the video to learn/review the structural components and functionalities of a pressure relief valve. This video is part of the CCPS – 7 Minute Seminars series.