Belimo B251ARX24-MFT Characterized Control Valve

Belimo B251+ARX24-MFT is a 2-inch, 2‑way Characterized Control Valve (CCV) with a non‑spring‑return MFT actuator, designed for precise hydronic flow control in HVAC systems. The valve body features a stainless steel ball and stem with a Cv of 65, a 200 psi close‑off rating, and a NEMA 2/IP54 enclosure; it operates in ambient temperatures from -30°C to 50°C (-22°F to 122°F) with 5–95% RH non‑condensing. The Multi‑Function (MFT) actuator provides programmable control inputs and feedback signals (2–10 VDC, PWM, or on/off), accepts 24 VAC or 24 VDC power (50/60 Hz), and offers about 150 seconds of run time (adjustable from ~90 to 350 seconds) with up to 180 in‑lb torque and 95° rotation, including external manual override and position indication. Plenum‑rated 18 AWG cable options are available in lengths of 1 m (3 ft), 3 m (10 ft), or 5 m (16 ft), and the assembly is UL/cUL, CAN/CSA, and CE listed for appropriate line‑voltage variants, making it suitable for VAV boxes, zone control, and other precise regulating tasks in modern HVAC systems.