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walk-in cooler externally balanced thermal expansion valve
walk-in cooler externally balanced thermal expansion valve
installation position: same as internally balanced. The difference is that the external balance type has an extra balance pipe, which is connected to the outlet of the evaporator from the valve body, and is close to the position of the walk-in cooler temperature sensor.
Principle of action: When working, the upper part of the elastic metal diaphragm is affected by the pressure of the working fluid in the temperature sensing bulb, and the lower part is affected by the evaporator outlet pressure and spring force. Under the action of three forces, the diaphragm bulges up or down, so that the valve hole is closed or opened to adjust the liquid supply of the evaporator. When the amount of liquid entering the evaporator is less than the heat load of the evaporator, the superheat of the vapor at the outlet of the evaporator increases, and the pressure above the diaphragm is greater than the pressure below, which forces the diaphragm to bulge downwards and compress by the ejector pin Spring, and push the valve needle open, make the valve hole open, the liquid supply will increase. Conversely, when the liquid supply is greater than the heat load of the evaporator, the superheat of the steam at the outlet decreases, and the pressure in the temperature sensing system decreases. The force above the diaphragm is less than the force below, causing the diaphragm to bulge upward , The spring stretches, the ejector rod moves up and the valve hole is closed, and the liquid supply to the evaporator is also reduced. When the system pressure is balanced, the walk-in cooler temperature sensing bulb pressure = spring pressure + evaporator outlet pressure.
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