BUTTERFLY VALVE HAVING IMPROVED POSITIVE CLOSURE MEANS

• US 3,556,476 A
• Filed: 07/11/1968
• Issued: 01/19/1971
• Est. Priority Date: 07/11/1968
• Status: Expired due to Term

• Current Assignee: Wheatley Pump and Valve Incorporated
• Original Assignee: Norman H. Haenky
• Inventors: Haenky, Norman H.
• Application Number:
  US04/744,193
• Time in Patent Office: 922 Days
• US Class Current: 251/306
• CPC Class Codes: F16K 1/24 with valve members that, on opening of the valve, are initially lifted from the seat and next are turned around an axis parallel to the seat

Abstract

This invention relates to a butterfly valve. More particularly, the invention relates to a butterfly valve having a body with a flow passage therethrough and a disc member supported in the flow passage rotatable between an opened and closed position, the disc member including means engaging portions of the body as the disc member is rotated into closed position, the cam means forcing the disc member into positive sealing engagement with a body seat.

Claims

1. A butterfly valve having improved positive closure means comprising:

a body having an axial flow passageway therethrough and smaller diameter coaxial upper and lower stem openings therein normal to and intersecting said flow passageway, said flow passageway including a seat portion;

a disc member positioned in said flow passageway defined by a substantially flat circular portion have a circumferential seating surface thereon, and disc member being rotatable between a closed position in which said seating surface engages said body seat portion and an opened position permitting fluid flow through said seat portion, and including an integral upper stem boss portion and an integral lower stem boss portion each extending perpendicularly from said circular portion in the direction opposite said seating surface, said stem boss portions being paralleled to and spaced from each other, said stem boss portions each having an aligned stem receiving opening therein;

an upper stem member rotatably and sealably received in said body upper stem opening and also received in said stem receiving opening of said disc member upper boss portion, said upper stem member extending externally of said body;

a lower stem member rotatably and sealably received in said body lower stem opening and also received in said stem receiving opening of said disc member lower boss portion, said disc member upper and lower stem boss portions each having a pin receiving opening thereon and perpendicular said disc member flat portion and each of said stem members having a pin receiving opening thereon;

a first pin received in said upper stem member pin receiving opening and said disc member upper boss portion pin receiving opening, and a second pin received in said lower stem member pin receiving opening and said disc member lower boss portion pin receiving opening, said stem receiving openings in said disc member boss portions being of a configuration permitting limited lateral displacemenT of said disc member relative to said stem members in the plane perpendicular said disc member flat portion; and

cam means integral with said disc member opposite said seating surface, said cam means engaging with a portion of said valve body as said disc member is rotated to the closed position to urge said disc member into sealing engagement with said seat portion.

2. A valve according to claim 1 wherein said body seat portion is defined by an enlarged internal diameter portion of said fluid passageway having internal threads, and a removable annular seat ring member having external threads on the circumference thereof, said ring member being threadably receivable in said threaded portion of said body, and said seat ring being further defined by an annular seating surface sealably engageable by said seating surface of said disc member when said disc member is in closed position.

3. A valve according to claim 2 wherein said seating surface of said seat ring is a concave cross section configuration and wherein said seating surface of said disc member is of convex cross section configuration.

4. A valve according to claim 2 including at least one small diameter internally threaded opening in said seat ring, the axis of said small diameter opening being a radius of the ring axis and in a plane of said external threads, and including a set screw threadably received in said threaded opening engageable with said body to prevent inadvertent rotation of said seat ring relative to said body.

5. A valve according to claim 1 wherein said disc member has an annular groove in said seating surface thereof and including an annular resilient gasket member received in said annular groove, a portion of said gasket member normally extending exposed past said disc member annular seating surface when said disc member is in the opened position and sealably engaging said body seating surface when said disc member is in closed position.

6. A valve according to claim 5 wherein said gasket member has a plurality of spaced-apart small diameter pressure relieving apertures therein.

7. A valve according to claim 1 wherein said body seat portion is defined by an enlarged internal diameter portion of said fluid passageway having internal threads, and a removable annular seat ring member having external threads on the circumference thereof, said ring member being threadably receivable in said threaded portion of said body and said seat ring being further defined in cross section by a reduced external diameter lip portion, said lip portion extending in the direction towards said disc member;

and a resilient annular seal member of internal diameter equal the external diameter of said lip portion, said resilient annular seat member being positioned between said seat member lip portion and said body annular passageway, said annular seal member sealably engaging said seating surface of said disc member when said disc member is in closed position.

8. A valve according to claim 7 wherein said seat ring includes a plurality of spaced-apart small diameter pressure energizing openings the axis of each being parallel said fluid passageway axial opening, each of said pressure energizing openings communicating with said resilient seal member at a point intermediate said seal ring lip portion and said body flow passageway.

9. A valve according to claim 7 wherein said resilient annular seal member is defined in part by a substantially frustoconical annular sealing surface member seating surface when said disc member is in closed position.

10. A valve according to claim 9 wherein said resilient annular seal member is defined in cross section by a rear surface engaging said seat ring and a spaced paralleled forward surface, the forward and rearward surface being perpendicular the interior and exterior circumferential surfaces and wherein said resilient annular seal member includes a plurality of spaced-apart small diameter pressure release openings therein, each of said openings coMmunicating said annular sealing surface with said rear surfaces.

11. A valve according to claim 7 wherein said body fluid passageway is defined in part by an annular reduced internal diameter body lip portion spaced from said threaded portion, wherein said annular resilient seal member is restrained between said seat member lip portion and said body lip portion.

12. A valve according to claim 11 wherein said body lip portion includes a plurality of spaced-apart small diameter pressure release openings therein.