The main function of a balance valve

A balance valve is a valve with special functions; it features good flow characteristics, an indication of the valve’s opening degree, an opening-locking mechanism, and a pressure sensing valve for flow measurement. By using a dedicated smart meter, the valve model and opening value are entered, and the flow rate through that balance valve can be displayed directly based on the measured pressure difference signal. As long as balance valves of appropriate specifications are installed in each branch line and at the user entrances, and a one-time calibration is carried out using the dedicated smart meter, the flow rate for each user can be adjusted to the desired value. A balance valve is a valve that performs dynamic and static balance regulation under hydraulic conditions. Such as static balance valves. A static balance valve, also known as a balance valve, manual balance valve, digitally locked balance valve, or two-position control valve, operates by adjusting the gap (opening degree) between the valve core and the valve seat in order to change the flow resistance through the valve and thus regulate the flow rate. It acts on the resistance in the system, enabling the distribution of water volume in accordance with the proportions calculated in the design; each branch sees an proportional increase or decrease in flow, thereby meeting the flow requirements for certain loads under the current weather conditions and achieving thermal balance. Dynamic balance valves are divided into dynamic flow balance valves, dynamic pressure difference balance valves, self-acting pressure difference control valves, etc. A dynamic flow balance valve is also known as a self-acting flow control valve, self-acting balance valve, constant-flow valve, or automatic balance valve. It adjusts its resistance coefficient automatically in response to changes in the system conditions (pressure difference). Within a certain range of pressure differences, it can effectively maintain a constant flow rate; that is, when the pressure difference before and after the valve increases, the valve closes automatically to prevent the flow rate from rising. Conversely, when the pressure difference decreases, the valve opens automatically, allowing the flow rate to remain constant. However, when the pressure difference is below or above the valve’s normal operating range, it is unable to provide additional pressure head, and in such cases, even when the valve is fully open or closed, the flow rate remains either lower or higher than the set value and cannot be controlled. A dynamic differential pressure balance valve, also known as a self-acting differential pressure control valve, differential pressure controller, pressure stabilization variable synchronizer, or differential pressure balance valve, uses differential pressure to regulate the opening degree of the valve. It exploits changes in the pressure drop across the valve element to compensate for variations in pipeline resistance, thereby maintaining a relatively constant differential pressure even when operating conditions change. Its principle is that, within a certain flow range, it can effectively keep the differential pressure in the controlled system constant: when the system’s differential pressure increases, the valve automatically closes to some extent, ensuring that the differential pressure remains stable; conversely, when the differential pressure decreases, the valve opens automatically to keep it constant. The self-pressure differential control valve keeps the valve plug in a closed position within its control range; when the pressure difference across the valve exceeds a preset value, the valve plug opens automatically, and its opening degree is adjusted automatically under the action of a pressure-sensitive diaphragm to maintain a relatively constant pressure difference across the valve.