Thermostatic Radiator Valve DANFOSS Redia M30x1.5 with RLV-KB 1/2" S

The DANFOSS Redia thermostatic radiator valve assembly M30x1.5 with RLV-KB 1/2" S is a factory-matched set combining a Redia thermostatic valve body (M30x1.5) and an RLV-KB 1/2" S lockshield/return fitting. It is designed for hot-water central heating systems to provide temperature-dependent flow control at the radiator, while the paired lockshield fitting allows hydraulic balancing and controlled return flow. The assembly is suitable for new installations and replacement of existing radiator valves in residential and commercial settings.

Advantages

This thermostatic valve assembly offers precise temperature regulation through a standard M30x1.5 valve interface, ensuring compatibility with common thermostatic heads. The integrated combination of valve body and RLV-KB lockshield simplifies installation by providing a matched flow and return pair, reducing the need to source separate components. Constructed for hot-water systems, the design supports stable flow control and reliable sealing to minimise leakage risk under normal operating conditions.

Suitable for

• Domestic radiators in apartments and houses
• Commercial radiators in offices and small public buildings
• Retrofit replacement of existing M30x1.5 thermostatic valves
• Hydronic heating circuits requiring manual balancing and return control

Key specifications

• Valve connection type: M30x1.5 thermostatic valve interface
• Lockshield/return fitting: RLV-KB 1/2" S
• Application: hot-water central heating radiators
• Function: thermostatic flow control with paired return/lockshield
• Material characteristics: corrosion-resistant valve body suitable for heating fluids (water/glycol mixtures within system limits)
• Installation orientation: compatible with standard radiator valve positions (inlet/return pair)

How to use

Install the Redia valve body on the radiator inlet where an M30x1.5 thermostatic head will be fitted. Fit the RLV-KB 1/2" S lockshield on the return connection to allow controlled balancing of the circuit. After mechanical installation, fit a compatible thermostatic head to the M30x1.5 interface and set desired room temperature. Use the lockshield to adjust flow balance across the radiator circuit according to system commissioning procedures. Observe standard safety precautions: isolate the heating circuit and drain the radiator or system section before removal or installation to avoid water loss or scald risk.

Usage recommendations

For reliable operation, commission the heating system after installation by balancing radiators using the lockshield and verifying thermostat response across a range of settings. Use compatible thermostatic heads designed for M30x1.5 fittings. Avoid aggressive cleaning agents on valve components and follow the heating system manufacturer's guidelines for glycol concentration and operating temperature to prevent material degradation.