Patent ID: 7264221
Filing Date: 2007-09-04
Classification: F16K

Abstract:
1. A control valve assembly comprising: a valve body including an open passage extending from an upstream face surface to a downstream face surface of the valve body, the open passage defined by a generally cylindrical outer wall; a valve disc positioned within the open passageway and rotatable about a pivot shaft having a shaft axis, a valve disc having a first outer sealing edge and a second outer sealing edge, wherein the first and second outer sealing edges of the valve disc are on opposite sides of the shaft axis; a valve seat formed in the open passage, wherein the valve disc is selectively movable between a seated position in which the first and second sealing edges are in contact with the valve seat and an open position in which the first and second sealing edges are out of contact with the valve seat, wherein movement of the valve disc between the seated position and the open position varies the degree to which the valve disc blocks the flow of fluid through the open passage; a flow insert positioned along a portion of the generally cylindrical outer wall at a location generally aligned with the first outer sealing edge, wherein the first outer sealing edge remains in close proximity to the flow insert as the valve disc moves away from the seated position to restrict the flow of fluid past the first outer sealing edge; a first butterfly cage mounted to the upstream face surface of the valve body, the first butterfly cage having a flow control wall positioned on the same side of the shaft axis as the first outer sealing edge of the valve disc, the flow control wall having at least a pair of flow openings; and a second butterfly cage mounted to the downstream face surface of the valve body, the second butterfly cage having a second flow control wall positioned on the same side of the shaft axis as the second outer sealing edge of the valve disc, the second flow control wall having at least one flow opening.