Check Valves

Non-return valves: non-return flaps and check valves

Check valves and non-return valves are important components of modern pipework systems and reliably prevent the backflow of media.

Gestra non-return valves (RK86, RK86A, RK76, RK70, RK71):

Nominal sizes DN15-DN100, pressure ratings PN10/16/25/40 and Class150/300. can be ordered online in the Fergo shop.

Non-return valve (RK100, RK101, RK104, RK106):

Versions: Threaded, intermediate flange.

Materials: Stainless steel, galvanised steel, PVC-U, PP-H, brass.

Seals: NBR, EPDM, FKM (Viton), PTFE, metal.

Options: With/without spring return, DN15-DN600.

Check valves RV108/RV101/ZV116/ZV216: Body: Stainless steel, galvanised steel (1.0619 ), grey cast iron, ductile cast iron (GGG40.3), DN8-DN2580.

Ball check valves RB105/RB106: Stainless steel/spheroidal graphite iron, socket or flange connection.

Double wing check valves RF200/RF202: Stainless steel/steel/spheroidal graphite iron, DN50-DN300.

Foot valves RV105: Brass, DN15-DN100.

These non-return valves are used in drinking water, heating, wastewater and industrial systems for greater safety and efficiency.

High-quality materials and seals such as NBR, EPDM, FPM-Viton or PTFE guarantee durability and corrosion resistance.

Differences between swing check valves and non-return valves

Closing mechanism: Check valves close by gravity or back pressure, while non-return valve use a spring that allows them to close quickly.

Installation: Check valves often require a specific installation position, whereas non-return valves can be used universally.

Pressure & flow: Check valves are suitable for low to medium pressures, while non-return valves are optimised for high pressures and fast closing.

Maintenance & costs: Non-return valves are simpler in design, easier to maintain and less expensive. Check valves are more complex, require more maintenance and are more expensive.