When the water level in reservoir becomes low, solenoid valve opens by the electronic signal of beginning of water supply and the chamber connecting with solenoid valve inside of body becomes in the condition of atmospheric pressure. Because the power in the same pressure is directly proportion to the width and the lower part of piston is wider than the upper part of disc, piston moves to upward by the water pressure and disc assembled to piston opens and fluid can flow toward outlet. If it is impossible to control electrically due to electricity off or breakdown of solenoid vlave, transfer to the operation of mechanical pilot valve by opening manual selector screw. At this time Bescon valve opens by the opening of mechanic pilot valve when the water level becomes low.When the water level in reservoir becomes low, the chamber inside of body becomes in the condition of atmospheric pressure as opening pilot valve, piston moves to upward by the water pressure because the lower area of piston is larger than upper side of disc and disc assembled to piston opens at the same time and fluid can flow toward outlet.
CLOSE
When the water level in reservoir becomes high, solenoid valve closes
by the electric signal of high water level and the chamber pressure becomes
same with the inlet pressure by flow way through the chamber and liquid
room of inlet, fluid flowing toward outlet will close since disc closes
valve seat as moving downward by the weight of piston assembly, the power
of spring and all the powers to piston assembly. When solenoid valve doesn't
close due to the error of solenoid, mechanic pilot valve closes secondarily
pilot line and so Bescon valve closes safely.