In the refrigeration unit, if water enters into the refrigerant circulation system, the water will react with the refrigerant, resulting in corrosion of pipelines and metal parts, and deterioration of lubricating oil; for Freon refrigeration system, it is also easy to cause “ice jam” phenomenon of the throttle valve.
In short, the function of solenoid valve is to cut off the circuit of the system when the compressor stops, so as to avoid liquid hammer when the compressor starts next time. it is generally used in a larger refrigeration system.
In the vapor compression refrigeration system, the compressed ammonia steam (or Freon steam) is superheated at high pressure and high temperature. Because of its fast flow rate and high temperature. Due to the high temperature, some lubricating oil on the cylinder wall will inevitably form oil vapor and oil droplet particles, which will be discharged together with refrigerant vapor.