US 4,215,846 AGranted

Multiportion unitary valve seat and valve incorporating it

AssigneeHoneywell Inc.

InventorsMitsumasa Ishizuka, Makoto Kawai

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Abstract

The disclosed valve seat is a unitary member consisting of a rigid annular portion supported from an annular base portion by a resilient, annular, wall-like connecting portion. In the disclosed valve, this base portion is secured in the valve housing to space the noted three portions concentrically along the fluid flow path through the housing. As the cooperating eccentrically-rotated valve plug contacts the seating portion, the plug exerts a force on the seating portion which converges the walls of the connecting portion. This prevents jamming between the plug and the seating portion while permitting a tight fluid seal to be established between those parts. A preferred shape (FIG. 2) for the connecting portion which provides such jam-free but tight fluid sealing action is that of a truncated cone having its larger inner diameter at the base portion of the seat member and its smaller inner diameter at the seating portion of the seat member.

Claims6

Dependent claims

In an eccentric rotary fluid flow control valve including

a housing containing a fluid flow path,
a unitary seat member having an annular base portion secured in said housing along said flow path and having a rigid annular seating portion spaced from said base portion and having an axis lying along said flow path,
a plug having a seating surface having a center of curvature, and
means for supporting said plug for rotation of said seating surface into and out of force exerting fluid sealing engagement with said seating portion about an axis which is radially offset with respect to said axis of said seating portion, the improvement comprising
a resilient annular connecting wall portion for said seat member integrally joining said base portion and said seating portion together into a unitary structure and supporting said seating portion from said base portion, said wall portion being of truncated conical shape and having an inner diameter which decreases gradually and continuously from said base portion to said seating portion, with the largest value of said inner diameter being equal to the inner diameter of said base portion, with the smallest value of said inner diameter of said wall portion being equal to the inner diameter of said seating portion, andd with the apex point of the cone formed by line extensions of said wall portion lying within a cone formed by lines connecting said center of curvature of said seating surface to the points of engagement between said seating surface and said seating portion which result when said seating surface has been moved into said sealing engagement with said seating portion,
whereby force exerted on said seating portion by said plug seating surface deforms said wall portion in the direction to converge the walls, and hence reduce said inner diameter, of said wall portion.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/889,872Filed 23 Mar 1978
Priority: JP 52/361831 Apr 1977
Granted: 5 Aug 1980
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

F16K 1/2007
With axis of rotation arranged externally of valve member: specially adapted operating means therefor
F16K 1/2078
Special features or arrangements of the sealing: sealing means for the axis of rotation
F16K 1/221
With axis of rotation crossing the valve member, e.g. butterfly valves: specially adapted operating means therefor
F16K 1/2268
Shaping or arrangements of the sealing: sealing means for the axis of rotation