Butterfly valve assembly with improved flow characteristics
First Claim
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.
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Accused Products
Abstract
A control valve assembly that utilizes a butterfly valve having a valve body and a valve disc movable between a seated position and an open position. The control valve assembly includes a flow insert positioned along the interior of the valve body and generally aligned with a first outer sealing edge of the rotatable valve disc. The flow insert maintains close spacing to the first outer sealing edge of the valve disc as the valve disc initially moves away from the valve seat. The control valve assembly can also include a first, upstream butterfly cage and a second, downstream butterfly cage positioned on opposite sides of the valve body. The first and second butterfly cages aid in controlling the flow of fluid past the valve disc as the valve disc moves from its seated position to its open position.
47 Citations
13 Claims
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1. A control valve assembly comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for modifying the flow and control characteristics of a butterfly valve having a valve body including an open passage defined by a generally cylindrical outer wall extending from an upstream face surface to a downstream face surface and a valve disc positioned within the open passage and rotatable about a pivot shaft along a shaft axis, the valve disc having a first outer sealing edge and a second outer sealing edge on opposite sides of the shaft axis and a valve seat formed in the open passage, where the valve disc is selectively movable between a seated position in which the first and second sealing edges are in contact with a valve seat and an open position to vary the degree to which the valve disc blocks the flow of the fluid through the open passage, the system comprising:
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a flow insert positionable 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 mountable 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 mountable 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 control wall having a flow opening. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification