Poppet valve flow seat
AssigneeCooper Industries, Inc.
InventorsRichard E. Shaw, Steven R. Wolverton
Life of this patent
Estimating the term…
Abstract
The edges of the port exits of a poppet valve seat member are each provided with a 30 degree chamfer and a counter-bore immediately upstream of the chamfer to significantly reduce exit flow losses. The depth/width of the counter-bore is between about 2:1 and about 3:1.
Claims12
In a poppet valve seat assembly including a seat member having a surface with at least one port, the port having an exit forming an edge with the adjacent portion of the surface, the seat assembly for use with a poppet movable into, and out of, engagement with the seat member for sealing, and unsealing, the port exit, respectively, the improvement comprising:
- (i) a chamfer formed at the edge of the port exit;
- and
- (ii) a counter-bore formed in the port exit edge immediately upstream of said chamfer with respect to the flow direction through the port.
In a poppet valve seat assembly including a seat member having a surface with a plurality of ports distributed about the surface, each port having an exit forming a circular edge with the adjacent portion of the seat member surface, the seat assembly for use with a plurality of poppets each moveable into, and out of, engagement with the seat member for respectively sealing and unsealing the exit of a corresponding one of the ports, the improvement comprising:
- a chamfer formed at the exit edge of each said port;
- and a counter-bore formed at each said port exit immediately upstream of said chamfer with respect to the flow direction through the port, said counter-bore cooperating with said chamfer to reduce the pressure loss caused by flow out of the port past the port exit edge,
- said chamfer having an angle of about 30 degrees with respect to the seat member surface, and said counter-bore having a characteristic depth "D" measured axially from said chamfer and a characteristic width "W" measured radially from the wall of the port, and the ratio D/W being between about 2:1 and about 3:1.
Dependencies are inferred from the claim text.