Static balance valve is also known as STAD balancing valve or STAD valve. Static balancing valve changes the flow resistance through the valve to achieve adjustment by changing the gap (opening) between the STAD valve core and the STAD valve seat. The static balance valve can keep the distribution of the new water volume according to the proportion calculated by the design. The branches after the STAD valve increase and decrease proportionally at the same time. The static balance valve meets the partial load flow under the current climate requirements. What is more, the demand for the STAD balancing valve plays a role in thermal balance.