the actuated butterfly valves are suitable for heating and cooling applications. they can also be employed for industrial applications, general services and water treatment. the vb series is equipped with standard on/off or modulating (4~20ma/0-10v,) control quarter-turn electric actuator. features 1. cast iron or nodular cast iron wafer body 2. centric butterfly valve with elastomer liner 3. manual override non-clutch design. manual operation can be operated without any lever, clutch or brake upon power voltage. 4. mechanical stops external adjustable limit stops 5. stall protection built-in thermal protection 6. low power consumption 7. position feedback 8. direct/reverse acting 9. 4-20ma/0-10v/2-10v choice 10. maintenance free 11. quick and easy installation 12. accurate valve positioning 13. indicator continuous position indicator 14. manual override non-clutch design 15. gear permanently lubricated and self locking