Check valve RLV-S 20 straight for side and bottom-fed radiators 003L0126

Check valve for radiators – reliable installation protection

The Danfoss RLV-S 20 return valve is an essential element in every central heating system, ensuring proper circulation of the heating medium. Designed for radiators supplied from the side or bottom, it protects the installation from unwanted backflow, which translates to stable temperature and efficient energy use. Its solid construction and nickel-plated finish guarantee long-term resistance to corrosion and mechanical damage.

Functionality and application

RLV-S 20 is a straight-way valve, meaning it does not have additional flow control. Its main task is to ensure one-way flow of water in the radiator installation. This prevents mixing of water from different circuits, which is particularly important in systems with multiple radiators or underfloor heating. The ability to adjust (regulate) allows it to be adapted to specific installation conditions. This valve works in both new installations and in the modernization of existing heating systems.

Key features and benefits

• Versatility: compatible with side- and bottom-fed installations – one valve fits different configurations.
• Backflow protection: prevents the backflow of the heating medium, maintaining stable radiator operating conditions.
• Durability: nickel-plated finish provides resistance to corrosion and mechanical damage, guaranteeing long life.
• Easy installation: simple construction makes installation and maintenance easier – saving time and costs.
• Efficiency: Kv value range from 0.2 to 1.8 and Kvs value 2.2 allow for optimal matching to installation parameters.
• Reverse flow direction: the possibility of mounting in the reverse flow direction increases installation flexibility.
• Internal thread: model with an internal thread end facilitates connection to pipes of 3/4 inch size on both the pipe side and the radiator side (radiator connection size: 3/4 inch (20)).

The RLV-S 20 valve is a proven component of every central heating system, providing reliable protection and efficient operation of the installation for years to come. It is a product worth recommending to both professional installers and individual users who care about thermal comfort in their homes.