Butterfly valve with improved stem sealing means

Claim 2

A butterfly valve comprising: a. a valve body with a cylindrical bore therethrough and diametrically opposed openings communicating with said bore, pivot means rotatably mounted in said bore; b. a resilient inner lining in the cylindrical bore of the valve body and seated therein; c. diametrically opposed openings in said resilient inner lining aligned with the respective openings in the valve body; d. diametrically opposed flat surfaces formed in said resilient inner lining and each having said respective opening centered therein; e. a substantially rigid butterfly disc on a diameter passing through said aligned openings and having a rim dimension greater than the interior dimension of said resilient inner lining said disc operatively engaging said pivot means; f. diametrically opposed flattened surfaces on the rim of said disc, said flattened surfaces being normal to the diameter passing through said aligned openings, said flattened surfaces each having a recess therein to form lands for engagement with and deflection of said respective flat surface of said resilient inner lining; and g. means for rotatably moving said disc to effect an uninterrupted line of sealing engagement between said disc and said resilient inner lining.

Claim 3

In a butterfly valve of the type including a valve body with a cylindrical bore therethrough and diametrically opposed openings for receiving pivot means, the improvement of means for high-pressure leakproof sealing comprising: a. a substantially rigid lining for the cylindrical bore of the valve body, said rigid lining having an outer surface adapted to seat in the cylindrical bore; b. a resilient inner lining adapted to seat in the rigid lining; c. diametrically opposed openings in said rigid lining and said inner lining adapted for alignment with the openings in the valve body; d. diametrically opposed flat surfaces formed in said resilient inner lining and each having said respective opening centered therein; e. a substantially rigid butterfly disc on a diameter passing through said aligned openings and having a rim dimension greater than the interior dimension of said resilient inner lining; f. diametrically opposed flattened surfaces on the rim of said disc, said flattened surfaces being normal to the diameter passing through said aligned openings, said flattened surfaces each having a recess therein to form lands for engagement with and deflection of said respective flat surface of said inner lining; and g. means for rotatably moving said disc to effect an uninterrupted line of sealing engagement between said disc and said resilient inner lining.

Claim 4

In a butterfly valve of the type including a valve body with a cylindrical bore therethrough and diametrically opposed openings for receiving pivot means, the improvement of means for high-pressure leakproof sealing comprising: a. a substantially rigid lining for the cylindrical bore of the valve body, said rigid lining having an outer surface adapted to seat in the cylindrical bore; b. a resilient inner lining adapted to seat in the rigid lining; c. diametrically opposed openings in said rigid lining and said inner lining adapted for alignment with the openings in the valve body; d. diametrically opposed flat surfaces formed in said resilient inner lining and each having said respective opening centered therein; e. a substantially rigid butterfly disc on a diameter passing through said aligned openings and having a rim dimension greater than the interior dimension of said resilient inner lining; f. diametrically opposed flattened surfaces on the rim of said disc, said flattened surfaces being normal to the diameter passing through said aligned openings, said flattened surfaces each having a recess therein to form lands for engagement with and deflection of said respective flat surface of said inner lining; and g. means for rotatably moving said disc to effect an uninterrupted line of sealing engagement between said disc and said resilient inner lining.

Claim 5

In the butterfly valve as set forth in claim 2 wherein: a. said lands are each shaped so that one portion thereof forms a portion of the circumference of said disc; and b. said lands are each shaped so that another portion thereof forms a portion of said respective flattened surface of said disc, said first-named portion and said other portion of said lands being coplanar with the intersection of said flattened surfaces and the rim of said disc.

Claim 6

In the butterfly valve as set forth in claim 3 wherein: a. said recess in each of said flattened surfaceS of said disc has a bottom wall spaced from a plane normal to the diameter passing through said aligned openings and extending through the intersection of said respective flattened surface and the rim of said disc a distance sufficient to avoid interference between said respective bottom wall and said flat surface of said resilient inner lining.

Claim 7

In the butterfly valve as set forth in claim 4 wherein: a. said means for rotatably moving said disc is a stem on the diameter passing through said aligned openings; and b. said recess in each of said flattened surfaces of said disc is annular and has a diameter sufficiently greater than the diameter of the stem to provide a reservoir of uncompressed resilient material between the stem and the point of intersection of said respective flattened surface and the rim of said disc.

Claim 8

In the butterfly valve as set forth in claim 5 wherein the uninterrupted line of sealing engagement between said disc and said resilient inner lining is a closed figure including: a. a pair of arcs each having opposite ends thereof spaced from respective opposite ends of the other arc; and b. a pair of circles normal to and longitudinally spaced along the diameter passing through said aligned openings, each of said circles having one end of each arc intersecting said circle to form a closed figure.

Claim 9

In the butterfly valve as set forth in claim 3 wherein: a. said rigid lining has diametrically opposed flat annular surfaces with each flat annular surface having said respective opening centered therein; b. said flat annular surfaces in said resilient inner lining has a diameter less than the diameter of the respective flat annular surface in said rigid lining; and c. said lands each have a diameter substantially equal to the diameter of said respective flat annular surface in said resilient inner lining engaged thereby.

Claim 10

A disc-type flow control valve comprising: a. a valve body having a cylindrical bore therethrough and diametrically opposed openings communicating with said bore; b. a substantially rigid lining for the cylindrical bore of the valve body and having an outer surface adapted to seat in the cylindrical bore, said rigid lining having diametrically opposed flat surfaces each having said respective opening centered therein; c. a resilient inner lining adapted to seat in the rigid lining, said inner lining having end flanges extending radially over the ends of said rigid lining; d. diametrically opposed openings in said rigid lining and said inner lining adapted for alignment with the openings in the valve body; e. diametrically opposed flat surfaces formed in said resilient inner lining with each surface having said respective opening centered therein; f. a substantially rigid butterfly disc on a diameter passing through said aligned openings and having a rim dimension greater than the interior dimension of said resilient inner lining; g. pivot means received in said disc and through said opposed openings in said body and said rigid and resilient linings for rotatably moving said disc; and h. diametrically opposed flattened surfaces on the rim of said disc, said flattened surfaces being normal to the diameter passing through said aligned openings, said flattened surfaces each having a recess therein to form lands for engagement with and deflection of said respective flat surface of said resilient inner lining, said lands having a greater spacing therebetween than the spacing between said flat surfaces in said resilient inner lining whereby rotation of said disc to a closed position effects a closed line of sealing engagement between said disc and said resilient inner lining.

Claim 11

A disc-type flow control valve comprising: a. a valve body having a cylindrical bore therethrough and diametrically opposed openings communicating with said bore; b. a substantially rigid lining for the cylindrical bore of the valve body and having an outer surface adapted to seat in the cylindrical bore, said rigid lining having diametrically opposed flat surfaces each having said respective opening centered therein; c. a resilient inner lining adapted to seat in the rigid lining, said inner lining having end flanges extending radially over the ends of said rigid lining; d. diametrically opposed openings in said rigid lining and said inner lining adapted for alignment with the openings in the valve body; e. diametrically opposed flat surfaces formed in said resilient inner lining with each surface having said respective opening centered therein; f. a substantially rigid butterfly disc on a diameter passing through said aligned openings and having a rim dimension greater than the interior dimension of said resilient inner lining; g. pivot means received in said disc and through said opposed openings in said body and said rigid and resilient linings for rotatably moving said disc; and h. diametrically opposed flattened surfaces on the rim of said disc, said flattened surfaces being normal to the diameter passing through said aligned openings, said flattened surfaces each having a recess therein to form lands for engagement with and deflection of said respective flat surface of said resilient inner lining, said lands having a greater spacing therebetween than the spacing between said flat surfaces in said resilient inner lining whereby rotation of said disc to a closed position effects a closed line of sealing engagement between said disc and said resilient inner lining.

Claim 12

The disc-type valve as set forth in claim 8 wherein: a. said lands forming recesses in said flattened surfaces form a reservoir within said lands for accommodating displaced material of said resilient inner lining; and b. said recess in each of said flattened surfaces of said disc has a bottom wall spaced from a plane normal to the diameter passing through said aligned openings and extending through the intersection of said respective flattened surface and the rim of said disc a distance sufficient to avoid interference between said respective bottom wall and said flat surface of said resilient inner lining.

Claim 13

The disc-type valve as set forth in claim 9 wherein: a. said lands are each shaped so that one portion thereof forms a portion of the circumference of said disc and another portion of said lands forms a portion of said respective flattened surface of said disc coplanar with the intersection of said flattened surface of said disc and the rim of said disc; b. said flat surfaces in said resilient inner lining has dimensions less than the dimensions of the respective flat annular surface in said rigid lining; and c. said lands each have a diameter substantially equal to the diameter of said respective flat surface in said resilient inner lining engaged thereby.

Claim 14

The disc-type valve as set forth in claim 10 wherein the closed line of sealing engagement between said disc and said resilient inner lining includes: a. a pair of arcs each having opposite ends thereof spaced from respective opposite ends of the other arc, said arcs being in a plane having therein the diameter passing through said aligned openings; and b. a pair of circles normal to and longitudinally spaced along the diameter passing through said aligned openings, each of said circles having one end of each arc intersecting said circle to form a closed figure, said points of intersection of said arcs with each of said circles being at diametrically opposed points thereon.