PP-H Butt Fusion Check Valve Type 561 PN10 SDR 17.6

  Datasheet (PDF)

Georg Fischer PROGEF Standard Type 561 check valves are specifically engineered from isotactic polypropylene homopolymer (beta-PP-H) for demanding industrial piping systems carrying chemicals, industrial effluent, and process water. Operating without metallic springs, this true double union non-return valve eliminates corrosion risks and guarantees safe, unidirectional media flow across rigorous processing plants. The valve is rated for a nominal working pressure of PN10 (10 bar) and fully complies with EN ISO 16137 performance and dimensional standards.

The closing mechanism incorporates a hydrodynamically optimized, double-guided sealing cone engineered to maintain stable, vibration-free positioning even under elevated fluid velocities and turbulent flow conditions. Designed for vertical installation, the springless return cone ensures dependable gravity-assisted shut-off requiring a minimum water column of 2 meters to guarantee hermetic backward isolation. Fluid turbulence and pressure drops are minimized through the streamlined internal profile, protecting upstream components from liquid surge and backflow contamination.

Constructed with extended metric butt fusion spigots conforming to SDR 17.6, the valve allows direct jointing into matching industrial pipe networks using conventional butt welding or contact-free infrared (IR) fusion techniques. The true double union configuration facilitates rapid inline maintenance, inspection, and replacement without dismantling adjacent piping sections. Fitted with high-grade elastomeric seals in EPDM or FKM, the Type 561 check valve delivers exceptional chemical resistance against harsh acids, alkalis, and industrial process fluids within service temperatures ranging from 0 degrees to 80 degrees Celsius.