supermarket refrigerated showcase » article > commercial refrigeration > The role of the main valve and pilot valve in the supermarket refrigerated showcase (2)
The role of the main valve and pilot valve in the supermarket refrigerated showcase (2)
author: supermarket refrigerated showcase category: commercial refrigeration Views: 522Time: 2016-08-22
The main valve and pilot valve in the supermarket refrigerated showcase
When the evaporation pressure of the supermarket refrigerated showcase is lower than the pressure set by the pressure pilot valve spring, the pilot valve port is closed and the main valve is closed. The refrigerant in the upper chamber of the valve piston is discharged through the balance hole on the piston, and the piston closes the main valve port under the action of the spring force. It is a constant pressure main valve that uses a pressure pilot valve and a main valve to form a whole. Its function is basically the same as the pressure pilot valve + main valve. The only difference is that the evaporation pressure introduced into the constant pressure main valve enters from the auxiliary port at the inlet end of the valve, and there is no need to install a pressure introduction pipe. From the analysis of the regulation characteristics, the regulating valve that uses the pressure pilot valve + main valve (or constant pressure main valve) to control the evaporation pressure belongs to the proportional action type, that is, the valve opening is proportional to the change of the evaporation pressure. At the same time, there is a static deviation in the adjustment process, but because the sensitivity of the pilot valve and the main valve is higher, the static deviation is small, and the steam pressure can basically be maintained constant. The adjustment method of the pressure pilot valve + main valve is: before adjustment, install a pressure gauge at the inlet of the pressure pilot valve, and determine the evaporation temperature by 5~10℃ lower than the cabinet temperature, and the corresponding saturation pressure is the pressure supply Value. When adjusting, turn the spring of the pilot valve to the loosest position to allow the refrigeration device to enter normal operation. At this time, both the pilot valve port and the main valve are in the fully open position. With the operation of the refrigeration device, the cabinet temperature drops, and the evaporation pressure also drops accordingly. When the temperature of the supermarket refrigerated showcase drops to the specified temperature value, turn the pilot valve adjusting lever to adjust the spring pressure to adjust the pressure value at the inlet end to the given value, and then let the refrigeration device continue to run for a period of time to see if the pressure value is stable at the given value. In the setting value, if there is a deviation, make a slight adjustment until it meets the requirements. There are pressure pilot valves, main valves and constant pressure main valves and other product series in China, their codes are HF, ZF and HZF respectively.
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