Thermostatic expansion valve

For Freon system, the most common regulator is the thermostatic expansion valve , the meaning of the word "thermostatic" being that the valve is designed to maintain a constant amount of superheat temperature at the evaporator outlet.

Fine liquid filters are fitted to portect the small orifices in expension valves.

Dries are used in the liquid line from the condenser to remove any water accidentally admitted to the system.

Refrigeration plants are protected by high pressure cut-outs, low pressure cut-outs, oil failure cut-outs and safety valves or bursting discs.