supermarket refrigerated showcase » article > display freezer > Walk-in cooler pressure pilot valve, temperature pilot valve and main valve control method
Walk-in cooler pressure pilot valve, temperature pilot valve and main valve control method
walk-in cooler pressure pilot valve + temperature pilot valve + main valve control method
Its main function is to control walk-in cooler intercooler The temperature of the medium also controls the evaporation pressure. The main valve is controlled by the pressure pilot valve, so the evaporation pressure can be maintained within a certain range. Operation principle: The temperature sensing bulb of the temperature pilot valve is placed in the cooled medium. It can change the opening degree of the temperature pilot valve according to the temperature of the cooled medium (such as cabinet temperature or refrigerant liquid temperature), thereby adjusting the main valve The degree of opening makes the temperature of the cold medium controlled within a constant range. If the temperature of the cabinet rises due to an increase in load, the temperature pilot valve should be opened, and the main valve should be opened correspondingly, the refrigerant flow will increase, and the cabinet temperature will be reduced to a given value; on the contrary, if the load is reduced, the cabinet When the temperature drops, the temperature pilot valve should be closed down, and the main valve should also be closed down accordingly, the refrigerant flow will decrease, so that the cabinet temperature will rise to a given value. The combination control of
pressure pilot valve and main valve can control the evaporation pressure within a certain range and ensure that the evaporation pressure is not lower than the set value of the pressure pilot valve. At the same time, because the main valve is controlled by the solenoid valve, the main valve can only be put into operation when the solenoid valve is in the on state. If the walk-in cooler solenoid valve is in the off state, the main valve is immediately closed. The opening and closing of the solenoid valve can be controlled by a temperature relay or a pressure relay, which can be determined according to specific needs.
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