Belimo B311+TR24-SR US : 3-Way 1/2" Characterized Control Valve (CCV), Cv 1.9, Stainless Steel Ball and Stem, Non-Spring Return Control Valve Actuator, 24VAC, 18 in-lb, 2-10VDC (4-20mA) Proportional Control Signal, 90 Second Run Time, 5-Year Warranty
