What is the application of a Hot Gas By-Pass on a liquid receiver for head pressure control?
If liquid back up is used, or the receiver is located in a cold area, there may not be enough pressure in it to force the liquid around the system. To maintain the receiver pressure an outlet pressure regulator can be used. A by-pass line is taken from the discharge to the liquid receiver and a regulator fitted in this line. When the receiver pressure falls below set point the valve opens and injects hot gas. As the pressure rises the valve closes.