Metal ball valves for gas
First Claim
1. In a valve includingA) a one-piece valve body extending along a longitudinal axis and having an inlet, an outlet, and a valve chamber between the inlet and the outlet, B) a shutter having a duct and mounted in the valve chamber for turning movement between open and closed positions in which fluid is respectively permitted to flow, and blocked from flowing, from the inlet through the duct toward the outlet, and C) a drive for turning the shutter, wherein the improvement comprises:
- a) a first generally planar surface integral with the valve body and located between the inlet and the valve chamber, a first annular valve seat opening onto the first surface, and a first annular seal in the first seat;
b) a second generally planar surface integral with the valve body and located between the valve chamber and the outlet, a second annular valve seat opening onto the second surface, and a second annular seal in the second seat;
c) the first and second surfaces being generally parallel to each other and lying in planes generally perpendicular to the longitudinal axis; and
d) the first and second seals extending entirely circumferentially around the longitudinal axis and projecting to the same extent axially past the first and second surfaces, respectively, into uniform sealing engagement with opposite sides of the shutter.
1 Assignment
0 Petitions
Accused Products
Abstract
An improved metal ball valve for gas comprises a shutter housing chamber in which are provided two opposite sides or flats allowing to define annular recesses in which shutter sealing gaskets are substantially integrally engaged. The shutter weight is advantageously reduced by providing, for example, a bottom flattened portion and an axial hole, the shutter forming moreover, with the valve rod element, preferably a single-piece assembly, the rod-shutter assembly being held in the body of the valve by upsetting thereon the thinned end crown of a collar of the valve body.
28 Citations
12 Claims
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1. In a valve including
A) a one-piece valve body extending along a longitudinal axis and having an inlet, an outlet, and a valve chamber between the inlet and the outlet, B) a shutter having a duct and mounted in the valve chamber for turning movement between open and closed positions in which fluid is respectively permitted to flow, and blocked from flowing, from the inlet through the duct toward the outlet, and C) a drive for turning the shutter, wherein the improvement comprises: -
a) a first generally planar surface integral with the valve body and located between the inlet and the valve chamber, a first annular valve seat opening onto the first surface, and a first annular seal in the first seat;
b) a second generally planar surface integral with the valve body and located between the valve chamber and the outlet, a second annular valve seat opening onto the second surface, and a second annular seal in the second seat;
c) the first and second surfaces being generally parallel to each other and lying in planes generally perpendicular to the longitudinal axis; and
d) the first and second seals extending entirely circumferentially around the longitudinal axis and projecting to the same extent axially past the first and second surfaces, respectively, into uniform sealing engagement with opposite sides of the shutter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification