PP-H Check Valve PROGEF Type 561 DN65-DN100 PN10

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The Georg Fischer PROGEF Standard Type 561 check valve is an industrial non-return valve engineered from isotactic homopolymer polypropylene (PP-H) for demanding chemical processing, wastewater management, and industrial water treatment installations. Available in dimensions d75 to d110 (DN65 to DN100) with a nominal pressure rating of PN10 (10 bar at 20 degrees Celsius), this valve prevents backflow in pressurized piping systems while maintaining exceptional chemical resistance against acids, alkalis, and aggressive media. As an authorised Georg Fischer distributor, BigWeld delivers genuine PROGEF components engineered to deliver reliable service life in harsh operating environments.

Designed specifically for vertical piping runs, Type 561 features a spring-free, double-guided return cone that operates silently and without flutter or vibration, even under elevated flow velocities. The hydrodynamically optimized profile provides high flow rates with minimal pressure loss. Because it operates without metal springs, fluid contact is limited entirely to premium polymeric materials, eliminating chemical corrosion risks. Sealing is achieved reliably through fluid backpressure, requiring a minimum water column of only 2 meters to form an effective, leak-tight seal with the EPDM or FKM elastomeric seats.

The valve assembly is equipped with factory-fitted PP-steel backing flanges (polypropylene with steel insert), combining the chemical resistance of thermoplastic housings with the structural rigidity required for uniform gasket clamping. The overall face-to-face installation length conforms to EN 558 basic series 1, facilitating direct integration or replacement in standardized piping grids. Flange drilling patterns comply with ISO 7005, EN 1092, and DIN 2501 standards. Certified in accordance with EN ISO 16137, the PROGEF Type 561 check valve offers process engineers and industrial installers a durable, maintenance-friendly solution for fluid control systems.