AERODYNAMICALLY AND HYDRODYNAMICALLY STABLE TORQUED BUTTERFLYVALVE AND VANE

摘要

The vane is provided with a baffle or flow guide at the aerodynamic center to effect an approximately equal flow velocity above and below the vane at that point. The differential pressures acting on the vane are approximately balanced for a substantial angular opening portion of the vane while being of reduced magnitude up to about 80 DEG of flow opening until reversing. The dynamic torque on the butterfly valve is substantially reduced by means of the baffle.