ABS Check valve type 561, Rp threaded sockets 3/8" - 2"

  Datasheet (PDF)

The ABS Check Valve Type 561 from Georg Fischer (GF Piping Systems) is a spring-free non-return valve with Rp threaded sockets, offered in seven sizes from 3/8 to 2 inch with EPDM seals. It provides reliable backflow prevention in ABS piping systems for cooling, chilled water, water treatment, marine installations and drinking water — the duties the grey ABS pipe and fitting range is built around, where ABS is chosen for its impact strength at low temperatures.

The valve is engineered for vertical installation: the return cone is lifted by the flow and closes under its own weight, so no spring is required and no permanent spring load is added to the pressure drop. The flow-optimised, double-guided cone stays centred in the stream, suppressing chatter and giving vibration-free operation even at high flow velocities, and seating squarely on every closing stroke. Leakproof sealing is guaranteed from a minimum water column of 2 m above the valve.

The compact construction keeps the overall length short, so the valve can be installed or removed inside an existing run, and the Rp sockets connect directly to threaded ABS fittings and transition adaptors. Installation dimensions are matched to the Type 546 ball valve, so a non-return stage and a shut-off point can be exchanged or combined in the same section without altering the layout.

• Type: 561 check valve, spring-free, double-guided return cone
• Body material: ABS, grey
• Seals: EPDM
• Connection: Rp threaded sockets, 3/8 to 2 inch (7 sizes)
• Installation: vertical; seals leaktight from a 2 m water column
• Applications: cooling, chilled water, water treatment, marine, drinking water

BigWeld supplies the Type 561 as an authorised Georg Fischer distributor, together with the matching ABS pipes, solvent cement fittings, unions and flange adaptors. Select the required thread size from the variant list.