Solenoid valve is a valve using electromagnetic force. It is an on/off valve that controls the flow of refrigerant in response to power failure. Solenoid valves can be broadly divided into two categories:
A refrigeration unit is a device used to realize a refrigeration cycle, which reduces the temperature and maintains a constant ambient temperature by absorbing heat. It is one of the most critical core components in a refrigeration system, and is therefore also known as the main unit of a refrigeration plant.