Domestic refrigerator cooling system commonly used refrigerant vapor compression cycle, which plays a vital role in the throttling device - thermal expansion gas Valve Manufacturer characteristics of little interest, led to many peers on the thermal expansion valve reasonable efficient allocation of a lack of understanding of the thermal expansion valve's lack of understanding of the actual energy-saving effect.

In fact, the thermal expansion valve in the refrigeration system, in addition to the refrigerant from the high pressure into low pressure by throttling to achieve the cooling effect, there is a very important function of the automatic control of flow, this function can be optimized to run in the refrigerant the ice (cooling) process, to maintain endothermic process of evaporation of refrigerant in the evaporator is fully utilized, so as to achieve the most economical and most effective cooling efficiency, energy conservation is to achieve our purpose, we use the cold in the refrigerator match the amount of expansion valve at the same time, their work required superheat control characteristics must not be overlooked.

We all know, thermal expansion valve is adjusted automatically flow through the evaporator superheat at the outlet of the control, where the size of superheat evaporator can be a direct reflection of the utilization of the evaporation area, if a thermal expansion valve operation superheat to make the department's small, then the utilization of high evaporation area, cooling efficiency is high, even if there's overheating degree zero, then this area-efficient evaporative evaporator 100%, relatively speaking cooling time is shorter.

As the current temperature of the thermal expansion valve, including its structural characteristics of the sensor's charge to determine the valve itself is to be an opening in the valve superheat and superheat a work, the flow of the refrigerant flow to adjust. Therefore, how to maintain the valve in the evaporator in the cooling process, there is always a smaller opening superheat, or even zero superheat work. It is our thermodynamic characteristics of the thermal expansion valve selection must be carried out and explore a topic.

Now well-known company's products have been provided to meet the requirements of various thermodynamic properties of the thermal expansion Top Burner Control Valve, in our country, while most manufacturers have yet to master this technology, but still some manufacturers have a variety of thermodynamic properties requires production experience and a successful product (including zero superheat), the well-known companies with foreign products are not inferior in comparison. Test is the following graph with superheat characteristics such as thermal expansion valve Danfoss and Bitzer Parker laboratory and similar products at the same time for testing (Figure 1), the test results reflect the cooling rate faster than similar products Danfoss, it evaporates in a stable temperature conditions of the temperature fluctuations only 4 ℃, and Danfoss similar products 10 ℃ (Figure 2), the test shows the product of domestic action noon should be good, low coefficient of sliding, temperature superheat small. Filling and other performance indicators can be better than the top foreign company's products.