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Walk-in cooler mid-check valve
author: supermarket refrigerated showcase category: walk-in display coolers Views: 521Time: 2016-08-22
walk-in cooler mid-check valve
walk-in cooler mid-check valve, also known as check valve or check valve, is a valve that allows only one-way flow of walk-in cooler refrigerant. In the refrigeration system, it is mainly installed between the outlet of the evaporator and the return pipe of the compressor. According to different working principles, check valves can be divided into direct-acting check valves and pilot check valves (controllable check valves). The installation and application of the check valve are as follows.
(1) In the case of a single machine with multiple cabinets, generally the evaporator temperatures of evaporators with different cabinet temperatures are not the same. A check valve should be installed on the outlet pipe of the evaporator with low evaporation temperature. It can prevent the refrigerant of the high-temperature evaporator from condensing in the low-temperature evaporator, and avoid the liquid shock cylinder when the compressor starts.
(2) When the temperature of the compressor installation is lower than the temperature of the condenser or accumulator, in order to prevent the refrigerant from flowing back into the compressor after stopping, a check valve should be installed on the exhaust pipe.
(3) For pipelines with back pressure difference, a check valve can be installed to prevent the back pressure difference from forcing the automatic control valve to open, so as to ensure the unidirectional flow of gas and liquid and the system works normally. For example, in Freon walk-in cooler refrigeration system, when hot gas is used for defrosting, the check valve should be connected in parallel to the thermal expansion valve so that the condensate in the evaporator will return to the liquid pipe through the check valve during defrosting. And it does not affect the operation of the thermal expansion valve during normal cooling. Another example is the automatic draining of different pressure vessels. When the draining main pipe is one, in order to prevent the oil from escaping into the low-pressure vessel due to the large back pressure when the high-pressure vessel is draining the oil, the oil is often discharged in the low-pressure vessel. Install a check valve after the valve.
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