When the refrigeration unit is running, if the condensing pressure is high, the compressor discharge temperature will rise; the compression ratio will increase; the cooling capacity will decrease; and the power consumption will increase. The higher the condensing pressure, the greater the above adverse effects. The high condensation pressure is mainly seen in summer. At this time, the condensation pressure should be reduced as much as possible to ensure the economy and reliability of the machine operation. In winter operation, the condensing pressure may be too low, and it will cause trouble to the work of the thermal expansion valve: the pressure difference between the front and back of the valve is too small, and the power supply for the liquid is insufficient, which reduces the thermal expansion valve's ability; , It also seriously affects the flow capacity of the thermal expansion valve. It is easy to cause the evaporator to lack liquid and the cooling capacity of the unit is greatly reduced. When the refrigeration device is running, only the condensing pressure is allowed to fluctuate within a reasonable range, too high or too low is unfavorable. Therefore, the condensing pressure must be adjusted. For refrigeration equipment that operates year-round, condensing pressure regulation is even more necessary.
The function of the condensing pressure regulating valve is to maintain the condensing pressure within the normal range when the refrigeration system is running. If the condensing pressure is too high during the operation of the refrigeration system, it will cause damage to the refrigeration equipment and increase power consumption; if the condensing pressure is too low, it will cause the liquefaction process of the refrigerant and the work of the expansion valve, so that the refrigeration system cannot work normally, resulting in The cooling capacity dropped significantly.
Condensing pressure regulating valve is generally installed on the cooling water pipe of the condenser (usually installed on the inlet side of the condenser), and the cooling water flow is adjusted according to the change of the condensing pressure. It directly adjusts the valve opening degree by directly sensing the pressure change of the refrigerant cycle to allow enough cooling water to flow through, which will save a lot of cooling water. Simply put, it is cooling as required. When the condensing pressure of the compressor increases (that is, the condensing pressure increases), the valve will automatically open, allowing more cooling water to enter the condenser and accelerate the speed of refrigerant condensation; conversely, when the condensing pressure decreases, the valve will The automatic shut down reduces the amount of cooling water entering the condenser, thereby keeping the condensing pressure within a certain range.