Technical data — threaded check valve RK104
- Series: RK104
- Nominal size: DN10 to DN100 (⅜" to 4")
- Connection: BSP female thread to ISO 228/1
- Body: Brass
- Flap disc: Brass
- Seal: NBR (soft-seated) or metal (metal-seated)
- Operating pressure: PN12 (DN10–DN25) / PN10 (DN32–DN100)
- Temperature: −10 °C to +110 °C (NBR) / to +180 °C (metal seal)
- Media: Water, hot water, compressed air, non-aggressive liquids and gases
- Installation: Horizontal and vertical (upward flow only)
Threaded check valve — NBR or metal seal?
| Feature | NBR seal | Metal seal |
|---|---|---|
| Temperature | −10 °C to +110 °C | −10 °C to +180 °C |
| Sealing principle | Soft-seated — bubble-tight | Metal-seated — minor leakage permissible |
| Typical media | Cold water, hot water, compressed air, heating | Steam, hot water, compressed gases |
| Closing behaviour | Low noise, fast closure | Robust, for higher cycles and temperatures |
| Application | Domestic plumbing, heating, cooling, irrigation | Steam condensate, process heat, industrial gas |
Media compatibility can be verified using the resistance check tool.
Applications — threaded swing check valve brass
The threaded check valve RK104 suits every application that requires a compact, economical backflow preventer with threaded connection. Typical uses include drinking water and service water lines, heating flow and return, compressed air systems, pump stations (as a non-return valve downstream of the pump), solar and geothermal loops, and irrigation systems. The low pressure loss of the swing design also makes the RK104 suitable where conventional check valves would create excessive flow resistance.
For larger sizes or flanged connections, FERGO supplies wafer check valves and dual-plate check valves. For corrosive media, disc check valves in stainless steel are available.
Installation — threaded check valve
The threaded check valve is screwed into the pipeline via BSP female thread to ISO 228/1. Seal the thread with PTFE tape, hemp or thread sealant. The flow arrow on the body shows the correct direction. The RK104 can be installed horizontally and vertically — for vertical installation, flow must run from bottom to top. Flush the line before commissioning to remove installation debris.
Threaded check valves in stock — EU-wide delivery
FERGO stocks all 17 variants of the RK104 threaded check valve — DN10 to DN100, with NBR or metal seal. Standard shipping via DHL arrives in 2–7 working days across Europe. Each check valve ships with datasheet and declaration of conformity. All certificates are available for download. For requirements beyond the standard range, FERGO engineers configure custom solutions.
Zertifikate
Maßgeschneiderte
Beständigkeitscheck
A non-return valve is a valve that allows liquids or gases to flow in one direction and prevents them from flowing back in the opposite direction. It is often used in pipework systems to prevent backflow and possible contamination.
Choosing the right sealing material for your swing check valve depends on several factors, including the type of liquid or gas, temperature and pressure conditions, chemical resistance and environmental factors such as UV radiation and ozone exposure. A specialist or the manufacturer can help you select the appropriate sealing material based on your specific requirements.
Yes, check valve or non-return valves can be used in both liquid and gas systems. However, it is important to ensure that the valve is suitable for the specific requirements of the gas system.
FPM (fluororubber, also known as Viton) is a favoured sealing material for demanding applications in non-return valves due to its high resistance to aggressive chemicals, high temperatures and various oils and fuels. It is frequently used in chemical and petrochemical plants, in the food and beverage industry and in the pharmaceutical industry.
Non-return valves are manufactured from various materials, including stainless steel, galvanised steel, brass and plastic. The choice of material depends on the application and the requirements for corrosion resistance and durability.
EPDM (ethylene propylene diene rubber) is a popular sealing material for non-return valves due to its excellent resistance to UV radiation, ozone and various chemicals. It is particularly suitable for applications in the field of water supply, heating and cooling systems as well as for sanitary installations.
NBR (nitrile butadiene rubber) is often used as a sealing material in non-return valves due to its resistance to oils, greases and various chemicals. It is ideal for applications in industrial plants, oil and gas pipelines and hydraulic systems.
Choosing the right sealing material for your swing check valve depends on several factors, including the type of liquid or gas, temperature and pressure conditions, chemical resistance and environmental factors such as UV radiation and ozone exposure. A specialist or the manufacturer can help you select the appropriate sealing material based on your specific requirements.
These valves are often used in water and sewage systems, heating, ventilation and air conditioning (HVAC) systems, and in industrial processes where it is important to prevent the backflow of media.
The two plate open in the direction of flow due to the pressure of the flowing medium. In the event of backflow or pressure drop, they collapse and close the passage to prevent backflow.
A double plate check valve is a check valve with two semi-circular flaps that open to allow flow and close to prevent backflow. It offers low pressure loss and a fast closing response.