Why is the fire hydrant drain valve leaking?
The fire hydrant closed in this state in the automatic drain valve open state, if Water Leakage, 1, internal fire hydrant water drain valve is not completely discharged, drainage; 2, the lower part of the fire hydrant valve Mifengbuyan, fire pipe water into the fire hydrant from the drain valve leakage.
The fire hydrant opened 1, if not fully open fire hydrant, fire hydrant drainage valve is not completely closed, the hydrant water will flow from the drain valve, drain valve 2, resulting in Water Leakage; if the drainage valve sealing surface anomalies (debris jam or sealing surface of a penetrating trauma), thrombus in vivo the water will flow from the drain valve, drain valve caused by Water Leakage.
Valve leakage water leakage and leakage, internal leakage is the main valve closed in place, sealing surface of a foreign case, damage to the sealing surface.Leakage is due to valve, hand wheel, filler or flange cushion broken, lack of bolt tension caused by leakage.
