Belimo TR24-3US Characterized Control Valve 24 VAC 18 in-lb NEMA 1

Belimo TR24-3 US Characterized Control Valve (CCV) with a 24 V AC non-fail-safe actuator delivers 18 in-lb of torque to directly operate a 1/2" (DN 15) or 3/4" (DN 20) ball valve. This 2‑way CCV uses On/Off, floating-point control and 90° rotation, designed for direct mounting on the valve with a single mounting screw for straightforward integration in HVAC piping. The actuator is housed in a NEMA 1/IP40 enclosure and ships with a plenum-rated 18 AWG control cable, typically 3 m long, to simplify wiring to a building automation system. Electrical characteristics specify a 24 VAC nominal input (range 19.2–28.8 VAC) with about 1 W of power draw, and it operates in ambient temperatures from -30°C to 50°C (-22°F to 122°F) with 5–95% non-condensing humidity. The device is non‑spring return (non‑fail-safe), meaning it does not automatically return to a fail-safe position when power is removed. Valve sizing details show Cv values of roughly 0.8 for the 1/2" DN15 variant and about 4.7 for the 3/4" DN20 variant, reflecting the different flow capacities of the valve bodies it couples with. In practice, this TR24-3 US configuration appears in Belimo’s CCV family as B217+TR24-3 US variants and is compatible with typical 24 V, On/Off control schemes used in modern HVAC controls.