Kpf-16 butterfly flow balance valve is a valve with special functions, which has good flow characteristics, can reasonably distribute the flow and realize the quantitative flow, and can effectively solve the problem of uneven temperature in the heating (air conditioning) system. Since the valve is equipped with opening indication, opening locking device and small pressure measuring valve for flow measurement, it is necessary to install balance valves of appropriate specifications in each branch and user inlet, and lock them after one-time commissioning with special intelligent instruments, so as to control the total water volume of the system within a reasonable range, thus overcoming the unreasonable phenomenon of "large flow and small temperature difference". This product is an ideal product in heating system