Belimo B261+AFRB24 : 2-Way 2-1/2" Characterized Control Valve (CCV), Cv 60, Stainless Steel Ball and Stem, Spring Return Valve Actuator, Direct Mount, 24VAC/DC, 180 in-lb, On/Off Control Input, <75 Second Run Time, 20 Second Spring Return, 5-Year Warranty