Wafer Check Valve RK100 – Backflow Prevention in Multiple Materials
The RK100 series wafer check valve prevents reverse flow of liquids and gases in industrial
pipelines. The compact wafer design is installed between two flanges – no additional bolting
or welding required. Face-to-face length conforms to
DIN EN 558.
Key technical data:
- Nominal sizes: DN32 to DN600
- Flange connection: PN6, PN10, PN16, PN25, PN40, ANSI Class 150 and Class 300
- Designs: with or without spring return
- Body materials: stainless steel 1.4408, carbon steel 1.0619 galvanised, aluminium bronze 2.0975, aluminium – Hastelloy and Duplex on request
- Disc: stainless steel 1.4408/1.4581 (standard)
- Seat materials: EPDM, NBR, Viton, PTFE or metal-to-metal
Material Options – From Stainless Steel to Aluminium Bronze
The RK100 non-return valve is available in five material families – each for specific
applications:
- Stainless steel 1.4408: universal use in chemical, food and process industries
- Galvanised carbon steel 1.0619: cost-effective solution for general industrial applications with clean media
- Aluminium bronze 2.0975: excellent corrosion resistance to seawater and marine environments
- Aluminium (spring-loaded only): lightweight design for HVAC and ventilation applications
- Hastelloy and Duplex: special alloys for aggressive chemistry – available on request
Spring-Loaded vs. Gravity Return – Comparing the Two Designs
The RK100 wafer check valve is available in two functional designs:
- Without spring return: The disc closes by gravity and back-pressure.
Installation only horizontal or vertical with upward flow. Suitable for slow processes without
water hammer risk. - With spring return: The spring assists rapid closing regardless of
orientation. The reduced closing stroke protects against water hammer and is ideal for pump
installations with frequent start-stop cycles.
Seat Materials and Temperature Ranges
The seat material is selected according to media and operating temperature:
- EPDM: −10 °C to +120 °C – water, air, aqueous media
- NBR: −10 °C to +90 °C – oils, greases, fuels
- Viton (FKM): −10 °C to +150 °C – acids, hydrocarbons, higher temperatures
- PTFE: −10 °C to +200 °C – aggressive chemistry, universal resistance
- Metal-to-metal: −25 °C to +300 °C – steam, high-temperature processes
Applications for the Wafer Check Valve
The non-return valve RK100 is used across a wide range of industrial piping applications:
- Chemical and petrochemical process plants
- Water and wastewater treatment
- HVAC, heating and cooling systems
- Food and pharmaceutical industries
- Pump stations and pressure boosting systems
- Shipbuilding, marine and seawater applications (aluminium bronze)
- General plant engineering
Buy the RK100 Wafer Check Valve Online at Fergo
The wafer check valve RK100 is
available from stock at Fergo
in all nominal sizes and material combinations. As a stainless steel variant with Viton seat,
Fergo offers the
type RK101.
For smaller nominal sizes with threaded connection, the
threaded check valve RV101
is available. For compact designs, choose the
disco check valve RV108.
