PROGEF PP-H wafer check valve Type 369

  Datasheet (PDF)

The Georg Fischer PROGEF Standard Type 369 wafer check valve is an engineered inter-flange non-return valve manufactured from high-grade beta nucleated polypropylene homopolymer (beta-PP-H). Designed for industrial process piping conveying aggressive chemicals, demineralized water, and industrial effluent, this wafer valve prevents reverse flow with minimal head loss. Suitable for compact mounting between standard backing flanges from d40 to d315 (DN32 to DN300), it provides a space-saving backflow prevention solution for modern process plants.

Technical specifications

The PROGEF Type 369 wafer check valve incorporates a spring-assisted closing mechanism that provides positive shut-off in horizontal and vertical piping arrangements. The integrated V4A stainless steel spring (AISI 316) ensures rapid disc closure before flow reversal can induce hydraulic shock or water hammer.

• Body material: beta-nucleated polypropylene homopolymer (beta-PP-H)
• Internal spring: V4A stainless steel (AISI 316 grade)
• Sealing elements: precision-moulded EPDM or FKM elastomeric gaskets
• Dimensional range: d40 to d315 mm (DN32 to DN300)
• Design life: 25-year operational service with water at 20 degrees C
• Hydrodynamic profile: smooth full-bore geometry for low opening pressure and reduced pressure loss

Applications

Engineered specifically for demanding media, the valve provides reliable backflow prevention in chemical processing plants, industrial water treatment facilities, and surface finishing lines. The beta-PP-H thermoplastic body offers outstanding resistance against non-oxidizing acids, caustic alkalis, inorganic salts, and aggressive process wastewater.

In water treatment and demineralization loops, the inert PP-H contact surfaces prevent fluid contamination while resisting scaling and chemical degradation. Facilities utilizing electroplating, pickling baths, and chemical distribution lines rely on the Type 369 to safeguard upstream pumps, flow sensors, and instrumentation from reverse pressure surges. The availability of high-grade EPDM and FKM elastomer seals allows engineers to tailor sealing performance to specific chemical concentrations and operating temperatures across diverse industrial sectors.

Installation and jointing

Designed for inter-flange mounting, the Type 369 installs directly between standard metric backing flanges and flange adaptors using suitable bolts and flange gaskets. Integrated outer body eyelets guide bolt alignment and ensure accurate centering within the bolt circle during installation.

The compact face-to-face wafer configuration significantly reduces structural weight and space requirements compared to conventional flanged non-return valves. When installing the valve in vertical lines, flow must be directed upwards to ensure proper spring and disc function. The outer alignment lugs prevent radial shifting and ensure uniform compression across elastomeric gaskets during bolt tightening. Proper torque sequence on the backing flanges prevents mechanical stress on the thermoplastic valve body, ensuring leak-free performance and long-term operational integrity across the piping network.