Cast Pressure Vacuum Valves

Description

Manufactured for forty years, the range of aluminium-bodied breather valves reached a high level of reliability and performance.

Provided with a premium tightness, got through a progressive decrease in acceptance limits in our tightness test procedures. With stainless steel inner parts (seats, discs, guides, screws and screens) housed in a solid casted aluminium body, this kind of valves is suitable for a lot of process fluids; in fact the oxygen contained in the air forms on aluminium surfaces an aluminium-oxide layer that increases corrosion resistance; this process is called auto-passivation and it is common to stainless steel as well .

Obviously aluminium cannot be installed with acids or strong basic solutions; however, aluminium gives satisfactory results with common hydrocarbons like petrol and diesel oil, with most of solvents , with alcohols , in waste water gas treatment (biogas) : we carried out maintenance on valves installed for twenty years and found that body thickness had not significative reduction even thanks to epoxidic painting we provide on external surfaces .

This range of valves is supplied with flanges from 2”up to 12” ANSI 150FF. From DN50 up to DN300 PN10. Setting: pressure from +22 up to +1000 mmH2O, vacuum from -22 up to -500 mmH2O.