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The pedal will return to a started state while people leave. By using lever principle to open the out water valves,at the same time closeing the in water valves. The pedal will sink while produce the gravity..By using lever principle to open the out water valves,at the same time closeing he in water valves Its beneficial to save water for the tank
Chen Weiliang ; Yua Jingbiao ; Lin Maoan ; Mai Jinchuan