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TVN V528 Electrical Float Level Control Valve is the hydraulic control valves, designed to control water level of water storing structures continuously by a electrical float placed in reservoirs and tanks. Electrical float sends signal to solenoid valve on main valve when water level decreases below preset level. Main valve opens and ensures that tank or reservoir will be filled permanently. When water reaches maximum level, electrical float resends signal to solenoid valve and main valve closes entirely.