PROGEF PP-H Wafer Check Valve Type 369 DN32-DN300

  Datasheet (PDF)

The Georg Fischer PROGEF Standard Type 369 wafer check valve is an industrial non-return valve engineered from beta-polypropylene homopolymer (beta-PP-H) for backflow prevention in chemical and process pipelines. Designed for installation between metric backing flanges across nominal sizes DN32 to DN300, it features a springless flap mechanism operated by line media and back-pressure. BigWeld supplies this compact valve as an authorised Georg Fischer distributor for demanding industrial fluid management.

Technical specifications

The Type 369 check valve utilises a compact wafer design with integrated alignment aids for fast and accurate centering between pipe flanges. Its hydrodynamic flap geometry minimises pressure loss across the valve seat while delivering dependable shut-off upon reverse flow.

Because the valve flap operates without a metal return spring, flow resistance remains exceptionally low during steady-state forward flow. Closing action is driven by gravitational return and hydraulic back-pressure, ensuring prompt sealing without mechanical fatigue. Profiled elastomeric seat seals in high-grade EPDM or FKM provide continuous chemical compatibility and bubble-tight isolation under reverse pressure conditions.

• Valve design: Wafer pattern non-return flap valve without spring
• Size range: Metric sizes DN32 through DN300 (outer diameters d40 to d315 mm)
• Body and flap material: Isotactic polypropylene homopolymeride (beta-PP-H)
• Sealing elements: Profiled elastomeric seat gasket in EPDM or FKM
• Design life: Calculated 25-year operational service life under nominal conditions at 20 degrees C
• Alignment feature: Integrated body centering eyelets for flange bolt circle positioning

Installation and jointing

The wafer valve mounts directly between standard backing flanges, fitting into short face-to-face spool dimensions without piping modifications. It can be installed in both horizontal and vertical piping runs.

For vertical pipeline layouts, upward fluid flow is the recommended configuration, allowing gravity to assist the unspringed flap during closure. When aligning the valve between PP-V or PP-steel backing flanges, the integrated body eyelets slip onto the bolt circle to guarantee concentric positioning with adjacent flange adapters. Uniform tightening of flange fasteners ensures even gasket compression across the profiled sealing surfaces without placing bending stress on the thermoplastic valve body.

Applications

Beta-PP-H construction offers high impact resistance, elevated thermal endurance and extensive chemical inertness across industrial environments. This makes the Type 369 suitable for aggressive chemical conveyance and industrial utility networks.

Typical installations include industrial wastewater treatment, chemical distribution systems, metal pickling lines, cooling water circuits and deionised water networks. The chemical inertness of polypropylene prevents corrosion from inorganic acids, alkaline solutions and industrial salt solutions, ensuring reliable backflow protection where conventional metallic check valves degrade.