Check valve type 562 with flanges metric PVDF

  Datasheet (PDF)

The Georg Fischer SYGEF Standard check valve type 562 with fixed flanges provides dependable, non-slam backflow prevention in demanding industrial chemical distribution and high-purity utility systems. Fabricated entirely from high-grade polyvinylidene fluoride (PVDF), the valve features a flow-optimized, double-guided return cone that maintains outstanding hydrodynamic stability, significantly reducing pressure drop while preventing chatter and remaining completely vibration-free even under elevated flow velocities. The double-guided mechanism maintains precise axial alignment throughout opening and closing strokes, preventing cone tilting and uneven seal wear during rapid flow reversals. The closing cone is preloaded with an internal spring made of 1.4310 stainless steel, achieving a 100% leak-tight closure in the idle or backflow condition independent of mounting position and without depending on a hydrostatic head, facilitating reliable operation in both horizontal and vertical pipeline layouts. High-grade FKM elastomeric seals provide exceptional resistance against oxidizing agents, aggressive acids, halogens, and deionized media across a broad continuous service temperature range from -20 degrees Celsius up to 140 degrees Celsius. Designed with a nominal pressure rating of PN16 across metric dimensions d20 to d63, the unit incorporates integral metric fixed flanges with overall face-to-face dimensions conforming to EN 558-1, directly matching the compact installation envelope of type 546 ball valves for rapid plant modularity and secure flanged jointing. The physiologically inert, unpigmented fluoropolymer construction supports steam, hot water, ozone, and aggressive chemical sanitization procedures without leaching, delivering reliable process safety in semiconductor manufacturing, pharmaceutical purified water loops, and chemical processing facilities.