F535E allows maximum flow presetting, pressure-independent balancing and electric control. The valve is pressure-independent with the built-in piping for easier installation and maintenance. Flow control is only related to the opening of the electric actuator, regardless of system pressure differential fluctuation. F535E valve authority is 100%. The actual and ideal flow characteristic curves is consistent. This helps precise and fast control, reduces operating frequency of the actuator. It gives the pump its optimal flow option, the system is now able to run under minimum flow with the lowest pressure differential, achieving stable, efficient and energy saving effect.