Check Valves

In some installations, a single capacitor is connected with several evaporators. Each evaporator at a different temperature. Two temperature valves are used to obtain the desired temperature. Check valves, sometimes put in the suction line of the cold evaporators. They prevent excessive warming the cold evaporator off cycle.

After the condenser ceased, one of the two-temperature valves may open capacitor is included. Low side could then flood the warm refrigerant vapor. This pair will also travel along the suction line in the cold evaporator.

If it falls into the evaporator, it will start condensation and releasing its latent heat. This will make the cold evaporator defrost or, at least, a little warm. Check valve is installed in the suction line of the cold evaporator only allows steam, which can be made from the evaporator.

It is important that non-return valves, seals tightly. Tliis prevent refrigerant leakage past the seat against the desired direction of flow. Such leaks are called refrigerant migration. Check valves should also be quick to open, when the refrigerant flow through them. If it is small or opens with difficulty, it will act as a throttling device and cause too high pressure drop. The result will be poor cooling in the cold evaporator.

Large capacity non-return valve. Note double cylinder design that provides smooth operation. Reverse cycle systems and some hot gas defrost systems use check valves. Check valves can be a source of noise in the refrigerator. They open and close with a metallic click or explosion. There is also noise associated with the ineffective operation of the valve. "Hammering" noise occurs when the valve is not fully close the reverse flow. In the hydraulic system, this is called "water hammer". Valves have been designed to minimize the problem of noise.

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