Air release valve delivery information

Small Orifice Air Release Valves — DN20 / DN25

The valves nobody photographs — and the ones maintenance gets called back for. Built like our big ones.

On a distribution network, the smallest valve on the line does the most work. Air leaves solution continuously under pressure, gathers at the high point, and a DN20 or DN25 release valve has to vent it a little at a time — thousands of cycles over its service life. No handle, no actuator, nobody watching. It works silently, or it fails silently. And silent failure is the problem. Scale builds on the nozzle, a float sticks in its cage, and the valve simply stops venting. The air pocket grows: the bore is choked, velocity rises, corrosion starts at the waterline, and the surge eventually shows up somewhere else in the line. The cause is rarely traced back to a small valve on a high point. That is why we build the small ones to the same standard as the transmission sizes. The body is cast in GGG50 ductile iron and epoxy coated inside and out. The nozzle seat is brass — the single part that takes the most wear on a continuously cycling valve. The cover bolts are A2-70 stainless steel, not zinc-plated carbon steel, because a corroded cover bolt turns a five-minute service into a cutting job. Small body, full-size discipline: tested unit by unit, packed 30 to a plywood case in a cardboard grid, and shipped alongside our DN80–DN200 double orifice range.

Distribution networks · Service connections · Pump stations · Building and plant water systems · Irrigation laterals · Fire water systems