Air valve type 591 PP-H socket fusion PN10

  Datasheet (PDF)

The Georg Fischer PROGEF Standard ventilating and bleed valve type 591 provides reliable automatic aeration and deaeration for pressurized industrial piping networks. Specifically engineered for demanding process lines conveying industrial water, wastewater, effluent treatment media, and aggressive chemical fluids, the valve continuously vents entrapped air during system filling and operational cycles while admitting atmospheric air during drainage to prevent damaging vacuum formation. Featuring metric socket fusion spigot ends, this valve integrates directly into SDR 11 piping systems rated for a nominal working pressure of PN10 (10 bar).

Constructed entirely from premium isotactic polypropylene homopolymer (PP-H), the valve body delivers high chemical resistance and exceptional thermal stability across typical process operating regimes, with a design operational life of 25 years with water at 20 degrees Celsius. At the core of the venting mechanism is an engineered PP-H floater with a precisely calibrated density of 0.91 g/cm³, ensuring immediate buoyant response and tight sealing against internal line pressure. The valve is fitted with high-performance EPDM or FKM elastomeric seals according to EN 681, providing dependable leak tightness and broad fluid compatibility across diverse chemical environments.

The valve is capped with a robust protective hood made from glass-fibre reinforced polypropylene (PP-GF) or polyoxymethylene (POM), safeguarding the venting orifice from environmental contaminants, dirt, and mechanical impacts. Metric socket fusion ends spanning outer diameters from d16 mm up to d110 mm allow homogeneous, crevice-free jointing using standard heating element socket fusion equipment. The compact axial body design minimizes overall installation footprint within plant skids, manifolds, and elevated pipe runs, while allowing straightforward inline disassembly and maintenance without extensive downtime.