Check valve Type 561 PP-H PN10

  Datasheet (PDF)

The Georg Fischer PROGEF Standard Type 561 check valve is an industrial non-return valve engineered from beta polypropylene homopolymer (beta-PP-H) for chemical processing, water treatment, and industrial fluid distribution. Operating without a mechanical spring, this gravity-assisted valve is designed specifically for vertical pipe runs carrying aggressive acids, alkalis, and process media up to 80 degrees Celsius at a nominal pressure of PN10.

Technical specifications

The Type 561 utilizes gravity and line backpressure to actuate the closure mechanism reliably without metal springs. Its hydrodynamic double-guided cone stabilizes flow patterns and prevents flutter, chatter, and mechanical vibration across varied fluid velocities.

• Operating pressure rating: PN10 (10 bar at 20 degrees Celsius)
• Minimum closing pressure: 2 m water column (0.2 bar differential)
• Body and cone material: beta polypropylene homopolymer (beta-PP-H)
• Sealing options: high-grade EPDM or fluorinated FKM elastomeric seals
• Dimensional range: metric outer diameters d20 to d63 mm
• Face-to-face length: standardized compact dimension according to EN 558-1

With a minimal seating threshold of only 0.2 bar, the valve guarantees positive backflow prevention while keeping internal pressure drops exceptionally low. The lack of wetted metallic components eliminates galvanic corrosion and fluid contamination, safeguarding pumps and sensitive instrumentation throughout an intended operational service life of 25 years.

Materials and standards

Constructed entirely from premium PROGEF beta-PP-H, the valve body resists strong acids, aggressive bases, and industrial salts. Components comply with international pressure piping standards and maintain long-term hydrostatic strength under industrial thermal conditions.

The integrated fixed flanges follow metric dimensions, matching the standardized lay length of Georg Fischer Type 546 ball valves under EN 558-1. This structural standardization streamlines skid fabrication, modular plant construction, and component replacement without altering existing pipeline geometry. As an authorised Georg Fischer distributor, BigWeld supplies certified thermoplastic piping systems and engineering support across Europe.

Installation and jointing

The Type 561 must be installed strictly in a vertical position with flow moving in the upward direction to allow gravity seating. Integrated fixed metric flanges enable direct bolting between adjacent flanged spool pieces using standard backing flanges and suitable flat gaskets.

Installers should verify correct flange alignment and tighten bolting uniformly in a crosswise pattern to recommended torque values to prevent bending stresses on the valve body. The springless construction requires zero mechanical spring maintenance, while the self-cleaning internal guide geometry prevents sediment build-up and maintains dependable actuation in continuous service.