The installation of a balancing valve should be carefully considered in terms of location. It can be placed on either the supply or return pipe, with one valve per loop being sufficient. For the secondary side of a thermal station, it's recommended to install the balancing valve on the return line, where the water temperature is lower, to facilitate more accurate balancing adjustments. On the main pipeline, the balancing valve should be installed downstream of the pump (on the supply side), to avoid excessively low pressure before the valve, which could lead to pump cavitation.
It’s best to install the balancing valve in a straight section of the pipe. Since the valve has flow measurement capabilities, ensuring stable flow conditions before and after the valve is essential for accurate readings. If possible, choose a straight pipe section for installation.
When connecting a new system to an existing heating or cooling network, it’s important to maintain balance between the new and original systems. Avoid situations where the new system introduces higher resistance than the original, which could disrupt the overall flow. For example, if the new system is connected at the end of the original network, no additional balancing valve may be needed. However, if it’s connected in the middle, a balancing valve should be installed at the original system’s entrance to maintain equilibrium.
Once the piping system is complete and testing conditions are met, all balancing valves should be set using specialized intelligent instruments, and their openings should be locked to ensure proper hydraulic balance. During normal operation, the valve openings should not be adjusted arbitrarily, especially not the locking mechanism, to prevent imbalance.
In maintenance scenarios, the balancing valve on a loop can be closed, acting as a shut-off valve during repairs. After the work is done, it should be returned to its original locked position. Therefore, there’s no need to install a separate globe valve alongside the balancing valve.
Whenever a loop is added or removed from the system, the balancing valves must be re-tuned. When adding or removing a loop, the corresponding balancing valves should be adjusted accordingly, and the original system’s balancing valves should be re-commissioned. However, the original balancing valves in branch loops typically don’t require readjustment unless necessary.
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