supermarket refrigerated showcase » article > walk-in display coolers > The role of the main valve and the pilot valve in the supermarket refrigerated showcase
The role of the main valve and the pilot valve in the supermarket refrigerated showcase
author: supermarket refrigerated showcase category: walk-in display coolers Views: 553Time: 2016-08-22
The role of the main valve and the pilot valve in the supermarket refrigerated showcase
A combined evaporation pressure control device. Its characteristic is that one type of pilot valve can be used as the control valve, and the main valve of multiple specifications can be used as the executive valve to meet the needs of various refrigeration devices. At the same time, according to actual control needs, various pilot valves with different performances can be connected in series to jointly control the operation of the main valve to obtain various control effects and improve control accuracy. The following introduces several combined control methods of main valve + pilot valve.
pressure pilot valve + main valve is the principle of using pressure pilot valve + main valve to control the evaporation pressure. The structure of the pressure pilot valve (also known as the constant pressure valve), the structure of the main valve is very complicated. Principle of action: The refrigerant vapor in the evaporator acts on the lower part of the diaphragm through the inlet of the pilot valve, overcomes the pressure of the spring, opens the pilot valve port, and allows the refrigerant vapor to enter the inlet of the main valve, push the one-way valve to reach The upper chamber of the main valve piston pushes the piston down, so that the main valve is at a certain degree of opening, and the evaporation pressure at this time is at a given value; if the evaporation pressure rises, the pressure on the lower part of the pilot valve diaphragm increases, and the pilot valve The opening degree of the valve port increases, so that the pressure in the upper chamber of the main valve piston increases, the piston moves down, and the main valve port opens accordingly, which increases the refrigerant outflow of the supermarket refrigerated showcase, and reduces the evaporation pressure and returns to a given value. value. Conversely, when the evaporation pressure drops, the pilot valve port closes, the pressure in the upper chamber of the main valve piston decreases, the piston moves up, and the main valve port closes, allowing the evaporation pressure to rise back to a given value.
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