- Oct 19, 2017 -
The condensing pressure of the saturated refrigerant liquid in the condenser or the accumulator is reduced to the evaporation pressure and the evaporation temperature, and the refrigerant flow rate into the evaporator is adjusted according to the change of the cooling load.
Common throttle body with capillaries, manual throttle, thermostatic expansion valve, float control valve, etc., the capillary does not have the regulation function, and three throttle can also adjust the refrigerant into the freezer evaporator flow to adapt Cooling load changes, in order to achieve the purpose of regulating the cooling capacity.
Manual throttle valve
Is the oldest throttle. Used for ammonia refrigeration equipment, manually adjust the flow of the valve hole area to change the amount of liquid to the evaporator. Usually in the industrial chiller Freon refrigeration system, the manual throttle valve as a spare valve installed in the bypass pipe, while the automatic throttle structure maintenance.
Float control valve
Is based on the level of change in the flow control valve, plays a throttle step by step and control the role of liquid level. It is a self-regulating throttle valve, commonly used in a free-level evaporator, gas-liquid separator and intercooler for the amount of automatic adjustment. At present it is mainly used for ammonia refrigeration equipment.
Thermal expansion valve
With the evaporator at the exit of the refrigerant temperature changes, through the role of temperature control mechanism, automatic control valve opening degree to control the refrigerant flow. The thermostatic expansion valve is mainly composed of body, temperature package and capillary. It is suitable for evaporators without free liquid level, such as dry evaporator, snake tube evaporator and snake tube type intercooler. Is the most commonly used chiller a throttle body.