Thermostatic Straight Valve 1/2" CALEFFI 402402

CALEFFI thermostatic straight valve 1/2" model 402402 is a straight inline valve intended for local temperature regulation in hot water heating systems. The valve body accepts standard 1/2" pipe connections and is operated by a separate thermostat head (not included). Designed for use with radiators and convectors, it provides stable flow control and positive shut-off when the thermostat closes.

Advantages

The thermostatic straight valve delivers accurate temperature control at the point of installation, reducing the need for manual balancing. Its straight, compact design simplifies installation in confined spaces and aligns with common 1/2" piping. The valve construction ensures reliable sealing and longevity under normal heating system conditions, and compatibility with interchangeable thermostat heads makes it flexible for different control settings.

Suitable for

• Domestic and light commercial radiators
• Convectors and fan-assisted heating units
• Retrofit and new-build heating circuits with 1/2" connections
• Local temperature control and room-level thermostatic regulation

Key specifications

• Connection type: straight inline 1/2" threads for pipe fittings
• Function: thermostatic flow control with positive shut-off
• Compatibility: designed for use with separate thermostat heads (head not supplied)
• Typical application: radiator and convector heating circuits
• Body material: corrosion-resistant metal suitable for hot water systems

How to use

Install the thermostatic straight valve inline on a 1/2" supply or return pipe using appropriate sealing and tightening methods for the chosen fittings. Attach a compatible thermostat head to the valve spindle; the valve will modulate flow according to the head setting and fully close when the head calls for shut-off. Commission the valve as part of the heating circuit by purging air, checking for leaks, and setting the thermostat head to the required room temperature. Follow accepted plumbing practice and local regulations during installation.

Usage recommendations

Use the valve with a thermostat head from the same manufacturer or an approved compatible head to ensure calibration and correct sensing. Avoid exposing the valve to freezing conditions or aggressive fluids. For long-term reliability, include the valve in periodic system maintenance: check for leaks, ensure the moving parts are free of debris, and operate the thermostat head through its range occasionally.