Function of water outlet of fire hydrant
The function of the discharge hole is to check the water on the valve, and to protect the hydrant. In the frozen north, in the use of fire hydrants, no drain holes, then exposed part of the ground water pipeline will be solidified into ice, broken fire hydrant; drain holes can discharge the fire hydrant valve above the water to prevent the freeze cracking fire hydrant.
When the outdoor hydrant is opened, the valve will block the hole and does not affect the normal water. When the fire hydrant is opened, the remaining water is discharged and the corrosion can be reduced! It's open for hours to check if there is water in the pipe!
Role: 1, the detection system whether there is water; 2, antifreeze repair, waterproof; 3, testing water quality;
