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1·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。

2·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。

3·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。

4·After draining, close drain valve.

排泄完毕，关闭排泄阀。

5·Suggest having local readout at manual valve for each drum so that operator can level in drum when draining.

建议每台罐在手动阀门处有就地读数，以便操作员在排凝时知道罐的液位。

6·Waste draining pipe, offlet or drain pipe should be connected to the main pipe; each pipe should connect two valves with the most possible short valve-to-valve pipe length.

排污管、放水管或疏水管应分别连接到各自的总管上，每管均应串接两个阀门，两阀门间的管段应尽量缩短。

7·The body screw back into place, gently open the little front-end ball valve, using compressed air to the drainage system of impurities, water, oil draining;

将阀体拧回原位，前端球阀轻轻打开一点，用压缩空气将排水系统内的杂质、水油排空；

8·Simultaneously, the ordure draining is observed and once the drainage is completed, the valve is closed in time to stop water draining.

同时注意观察污物排放情况，一旦冲尽，及时关闭阀门，停止放水。