Liquid level control apparatus

The utility model discloses a liquid level controlling device, comprising a liquid level control valve (1), a water discharging control valve (2) and a hot water outlet pipe (3). The liquid level control valve (1) is composed of a valve body (10), a cold water inlet (11), a water outlet (12), a hot water outlet (13), a liquid level adjusting screw rod (14), a spring (15), a press cap (16), a draw rod (17), a lower liquid entering check valve (18) and an upper liquid entering check valve (19). The cold water inlet (11) is connected with a running water pipe, and the water outlet (12) is connected with a solar energy water heater; the hot water outlet (13) is connected with the water discharging control valve (2), and the other end of the water discharging control valve (2) is connected with the hot water outlet pipe (3) whose top end is provided with an emptying hole (31). The liquid level controlling device can effectively control the water charging and discharging operations of the solar energy water heater, and cause no cold water to be retained in the water charging and the water discharging pipes, which is helpful for water saving; meantime, the water discharging control valve is controlled by a pull cord, so that the liquid level controlling device is easy, safe and reliable in use.