Abstract: A control valve assembly that utilizes a butterfly valve having a valve body and a valve disk movable between a closed position and an open position. The control valve assembly includes a flow control device positioned downstream from the butterfly valve. The flow control device includes a series of teeth spaced by a series of flow control channels such that as the valve disk moves from the seated position to the fully open position, the outer sealing edge of the valve disk passes over the series of teeth to gradually expose the flow control channels. The control device aids in reducing cavitation, offers reduced dynamic torque and allows the control valve assembly to be inserted between an inflow pipe and an outflow pipe.

Abstract: A valve having improved inherent flow characteristics, improved noise characteristics, and improved dynamic torque characteristics is provided. The valve includes a disk for controlling fluid flow inside the valve. The disk has a first vane and a second vane disposed relative to the first vane. In accordance with one embodiment, the second vane is disposed along an axis extending from a pivot point of the disk. In such an embodiment, the first vane is disposed offset from the second vane. The first vane and the second vane can be substantially parallel. The valve further includes an upstream indentation for dynamic torque reduction and can include noise and cavitation reducing features on a downstream side of the disk and/or an indentation for dynamic torque reduction in case of a fluid flow reversal.