At this time, slowly open the test ball valve completely, then a lot of water is discharged at the drainage outlet, close the test ball valve, the drainage device closes too, this shows that action of anti-pollution isolating valve is normal.
At this time, slowly open the test ball valve completely, then a lot of water is discharged at the drainage outlet, close the test ball valve, the drainage device closes too, this shows that action of anti-pollution isolating valve is normal.
此时缓慢将试验球阀完全打开，这时排污口有大量水排出，关闭试验球阀，排污器也随之关闭，这说明防污隔断阀动作正常。