Structure and application: This kind of valve makes up of main valve, pin valve, flux adjusting valve, pilot valve, ball valve and pressure meter etc. The flux control valve is installed in the water supply pipelines. Firstly, we can set one fixed flux to the 2 level flux adjusting valve of the pilot valve, which is on the top of the valve. In this way, can keep the flux through the main valve without any changing, so it can't affect the flux even when the above-main valve changed.