This category features industrial PP-H ventilating valves and ventilating and bleed valves engineered by Georg Fischer for butt fusion jointing. Manufactured from high-grade beta-PP-H, these valves provide automatic pipeline deaeration during filling, continuous air release during operation, and rapid vacuum relief during emptying. Rated for pressures up to PN10 across nominal sizes DN10 to DN100, they ensure reliable aeration and corrosion resistance in chemical processing, water treatment, and industrial fluid distribution systems.