Fixed water level valve is a diaphragm valve adjust thewater tank and water tower liquid level. Valve controlled by the float when the liquid level reaches the set altitude valvesignal to the pump through the relevant structures, waterpump to stop water supply: water pump when the liquid leveldrops below the set position automatically start water supply. The valve action is steady, effectively prevent theopen water hammer pump and stop pump water hammer, to avoid the pipeline to generate excessive pressure. Apply towater tanks, water towers of the automatic water supplysystem. Maintenance of the valve is simple, flexible and durable, level control, high accuracy, the water level is notthe water pressure to interfere with close close watertight, reliable performance.