Selection of flow control valves when the circulating water pump operates at variable flow rates

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Here it mainly refers to the selection of manual balance valves, self-acting balance valves, and differential pressure control valves. When the circulating water pump operates at variable flow rates, the manual balance valve is out of balance in a proportional manner, which is most favorable for the operation of the temperature control valve ； However, its drawback is that it requires too much manual operation, making it difficult to achieve ideal adjustment. The circulating water pump operates with variable flow, and the ideal set pressure difference at the inlet of each heat user should vary according to outdoor temperatures. In this regard, both self-acting balance valves and differential pressure control valves are not ideal, but regulation loss of control does not occur. Therefore, this type of control valve can be used, which is beneficial for improving the control performance of the heating system.