Check valve type 369 PVC-U

  Datasheet (PDF)

The Georg Fischer check valve type 369 PVC-U is a compact wafer-style non-return valve engineered for dependable backflow prevention in industrial thermoplastic piping systems. Designed for installation between flanges, the valve utilizes an advanced wafer architecture that significantly minimizes face-to-face dimensions and overall system weight compared to conventional non-return valves. Its internal operating mechanism relies on an aerodynamically profiled closing flap disc paired with a robust V4A stainless steel (grade 316) return spring, facilitating instantaneous closure as flow ceases and effectively counteracting reverse flow before hydraulic shock can develop. This spring-assisted design ensures rapid, chatter-free response and dependable sealing in both horizontal and vertical piping orientations, achieving positive shut-off at a minimal seating head of two meters water column. The high-grade unplasticized polyvinyl chloride (PVC-U) body provides excellent chemical resistance against acids, alkalis, and saline solutions, completely eliminating external atmospheric corrosion and internal scaling. For optimal sealing integrity across aggressive and neutral media, the valve incorporates premium EPDM or FKM elastomer profile gaskets that ensure hermetic shut-off along the seating face. Integrated exterior supporting eyelets simplify handling, alignment, and positioning during assembly, enabling precise centering between mating flange adapters without requiring special suspension tools. With its flow-optimized internal passage reducing pressure drop and energy consumption across industrial distribution networks, this wafer check valve delivers an exceptionally reliable, maintenance-free solution for chemical process lines, industrial water treatment, cooling circuits, and general manufacturing infrastructure.