Features of static balance valve:
1. The valve body adopts the direct flow structure, and the fluid resistance is small
2. The digital hand wheel shows the number of valve opening turns, which ensures that engineers can accurately and conveniently carry out hydraulic balance debugging. It can lock the maximum opening of the valve at any position and does not affect the normal closing of the valve
3. The inlet and outlet of the valve have self sealing measuring ports. After connecting with the hose of intelligent instrument, the pressure difference before and after the valve and the flow through the valve can be easily measured
4. The valve disc is of self balancing design, and the opening and closing are not affected by the pipeline pressure, and have the complete shut-off function

Selection and preset value:
Method one: software selection method
Using Zhengfeng hydraulic calculation software, the design flow Q and design pressure difference △ P are input to get the size and balance preset position of the balance valve. In order to obtain better accuracy, it is recommended that the balance valve should be positioned at the opening of 50% - 90%.
Method 2: look up table method
When the design flow rate Q and the design pressure difference △ P are known, the Kv value can be calculated by the following formula, and then the appropriate balance valve size and predetermined parameters can be selected from the Kv value table.