The U200 series are pilot operated self actuated globe type medium pressure back pressure regulating valves meant to regulate the inlet pressure at pre-determined set value required for the processes/equipment protection.

Movement occurs as pressure variations register above the diaphragm of main regulator. The registering pressure is the inlet or upstream pressure. The inlet pressure acts on the diaphragm of the pilot. Pilot is an upstream pressure control valve which opens in the event of high upstream pressure than its set pressure. Rise in inlet pressure above the set pressure opens the pilot affecting the main valve to open and flow to take place. The pressure is apply on the diaphragm in main regulator through pilot valve, it pushes the diaphragm down of main regulator, an opens the port. As inlet pressure is compensated, the pilot valve get closed, diaphragm in main regulator moves up due to spring force and port opening closes.