Leakage problem of drainage valve

When the main valve opens (internal pressure > 0.1 MPa), the drainage system automatically closes to prevent water discharge.

Anti freezing function

Normal State (Dry): The hydrant is empty, and the main valve’s sealing seat remains closed (conical sealing state). Filling Process: Rotate the upper valve stem cap counterclockwise, lifting the valve disc to open the inner chamber, allowing water to enter the hydrant system from the inlet.

Anti freezing function

Drainage System: When the main valve is closed, the valve disc seals against the seat, while the drainage system remains open, allowing residual water in the barrel to drain.