PP-H Butt Fusion Check Valve Type 561 PN10 SDR11

  Datasheet (PDF)

The Georg Fischer PROGEF Standard Type 561 check valve is engineered from isotactic polypropylene homopolymer (PP-H) for non-return flow control in demanding industrial piping networks. Designed specifically for vertical installation, this true double union check valve operates entirely without a spring, using gravity and fluid back-pressure to achieve dependable sealing. The flow-optimized, double-guided return cone guarantees smooth, vibration-free fluid transition even at elevated media velocities. BigWeld, as an authorised Georg Fischer distributor, supplies this industrial valve across Europe for chemical processing, industrial water treatment and effluent handling duties.

Manufactured in accordance with EN ISO 16137, the PROGEF Type 561 valve is rated for a nominal pressure of PN10 (10 bar) at 20 degrees Celsius. The extended metric butt fusion spigots conform to SDR11 dimensions, making the valve fully compatible with heated tool butt fusion and high-purity infrared (IR-Plus) welding equipment. True double union construction allows rapid radial installation and dismounting without dismantling adjacent piping sections, while the face-to-face dimensions align with Georg Fischer Type 546 ball valves for interchangeable plant layouts and streamlined maintenance.

The springless sealing mechanism requires a minimum static liquid column of 2 metres of water to ensure complete leak-tight shut-off. Depending on the chemical aggressiveness of the conveyed fluid, sealing rings are available in EPDM or FKM elastomer compounds. Isotactic PP-H exhibits outstanding long-term hydrostatic strength, exceptional resistance to stress cracking and high thermal stability across operating temperatures from 0 to 80 degrees Celsius. All wetted components resist aggressive salts, mineral acids and alkali solutions, supporting a designed service life of up to 25 years in continuous industrial utility systems. Available in sizes d20 to d110 mm.