Belimo B317+LF24-SR US : 3-Way 3/4" CCV Ball Valve, Cv 4.7, Stainless Steel Ball and Stem, Spring Return Damper Actuator, 24VAC/DC, 35 in lb, 2-10VDC (4-20mA) Proportional Control Input, 150 Second Run Time, <25 Second Spring Return, Damper Area up to 8.8 Sq.Ft