The utility model is especially suitable for the draining valve with big caliber and big displacement.
对大口径、大排量疏水阀尤为实用。
The utility model can prevent the discharge-orifice steel columns of the upper draining valve cover from cracking, increase the service life of oil-well pumps, and lower oil-production cost.
本实用新型可防止抽油泵在采油过程中上排出阀罩出油孔筋柱裂断，提高抽油泵的使用寿命，降低采油成本。
When boiler need big volume draining or level regulation valve failed to work, there should open bypass valve to draining.
当锅炉需要大量排污时，或液位调节阀故障时，应开通旁路阀加大排污。
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