Principle of balancing valve

Principle of Balancing Valve
The balancing valve operates based on internal counter-regulation within the valve body. When the inlet pressure increases, the valve automatically reduces its opening diameter, thereby decreasing the flow rate. Conversely, if the inlet pressure drops, the valve opens wider to maintain a consistent flow. However, if the valve is installed in reverse, the control system will not function properly. The main purpose of a balancing valve is to regulate the predetermined flow rate at each distribution point in a system—such as individual buildings. These valves are typically installed at the entrance of each building to ensure that the total flow in the heating system is distributed evenly. This function is similar to that of a silent check valve, but with more precise flow control.



It's important to note that the regulating plate inside the balancing valve is directional. If installed incorrectly, the reverse pressure can significantly reduce or even completely close the flow. Since balancing valves are primarily used for better heating performance, reverse installation is generally avoided. However, human error can still occur and should be corrected during installation.



Are balancing valves and flow balancing valves the same thing? Not exactly. A static balancing valve maintains a fixed flow rate by adjusting resistance, while a dynamic balancing valve adjusts the flow in real-time based on system conditions. Flow balancing valves are commonly installed on either the supply or return pipes of an air conditioning system. They help balance pressure by releasing excess pressure when necessary.



A flow control valve is designed to regulate the flow of liquids or gases. These valves are typically installed in the supply system or in a closed-loop system. The primary goal of using a balancing valve is to ensure that each heat user receives a stable and controlled amount of heat. In heating systems, adjusting the flow rate is essential for efficient operation. Systems that use balancing valves are usually variable flow systems. However, most heating networks today are designed based on basic heating requirements, and it's difficult to achieve full demand-based heating. As a result, hydraulic imbalance often occurs, especially in systems where only balancing valves are installed without heat meters. This imbalance becomes even more severe in such cases.



Self-operated flow balancing valves, which are installed at each building’s inlet, offer effective solutions but are costly and less commonly used. An alternative approach is to install self-operated balancing valves on branch lines. Currently, many systems use locked flow balancing valves, which require manual adjustments during the initial phase of network operation. This process is time-consuming, labor-intensive, and complex, making it challenging to adapt to changing network conditions. Nevertheless, this method remains an economical way to ensure proper hydraulic balance in heating systems. From: http://news.chinawj.com.cn Submission:

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