Selection and Application of Balancing Valve

The hydronic heating or cooling system is controlled by the balancing valve according to strict and precise requirements, and the flow change of the system is controlled to provide sufficient heating or cooling capacity to each part of the building with optimal efficiency. And reduce energy consumption, make the whole building get a comfortable and uniform temperature, and create a comfortable indoor environment.


Ⅰ. The application of the balancing valve


The balancing valve plays the role of balancing the resistance of each circuit in the air-conditioning system, and adjusting the flow rate. Therefore, it is an energy-saving element that can improve the delivery efficiency of the air-conditioning water system.


The primary function of the equilibrium valve is to ensure that the system is indeed operating according to the technical parameters, in line with the designer's original intention.


During the balance debugging process, some threats to the system function can be found and eliminated: including the implementation of incorrect balance calculation, as well as pure installation errors, such as incorrect installation of check valves or blocked filters, excessive pump lift and so on.


Problems can be identified immediately during the balancing process, root causes and corrective actions can be taken, ensuring that the system provides the best possible comfort at the lowest possible energy cost.


Ⅱ. The balancing valve control method and method:


1. The main method of using a balancing valve in an air conditioning system or a heating system is to determine the "control unit". When balancing the terminals on the branch, we regard each branch as a "control unit"; when the balance riser When it is time, we regard each riser as a "control unit"; when the system is more complex, we start from the small control unit to the control unit, and control it step by step.


2. Select the reference valve and cooperative valve. The reference valve is always located at the farthest terminal in the unit, and the cooperating valve can determine the total flow in the path.


3. Set the reference valve


Two basic conditions for setting the reference valve:


① The minimum pressure drop before and after the valve is 3KPa, and sufficient measurement accuracy has been obtained;


② The pressure drop of the most unfavorable terminal when it is fully opened at the design flow rate is 3KPa.


According to the self-resistance requirements of the balancing valve, when designing, the pressure difference (drop) △P of the valve should be greater than 3KPa, otherwise it will affect the accuracy of the measurement, and the local resistance coefficient of the valve is 10~14. More than 0.7m/s can ensure the more efficient operation of the system. Only in this way can the valve size be determined.

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