Sealing arrangement

Claim 2

Sealing arrangement comprising: a rigid body having a fluid passage therethrough including a tapered seat, a rigid closure having a flaring seating surface, said closure being disposed in said body and being free to move between a position in which said seating surface engages said seat and a position in which it is removed from said seat, said closure having an annular groove therearound adjacent said seating surface, said seating surface flaring toward said groove, a semi-rigid sealing ring disposed in said groove, said ring having a tapered outer periphery flaring in the same direction as said seating surface, said ring including lip means adapted to make initial and final contact with said seat as said closure moves toward and away from said seat, and elastomer seal means between said lip and said groove.

Claim 3

Sealing arrangement according to claim 1 in which said tapered seat and said tapered seating surface are both conical and of the same taper angle, the tapered outer periphery of said sealing ring having a diameter equal to that of said seating surface where the two are immediately contiguous, said tapered outer periphery of said sealing ring flaring at a greater angle than said sealing surface, said sealing ring being bonded to said groove in said closure.

Claim 4

Sealing arrangement according to claim 1 wherein there is an annular rabbet around the sealing ring at the lip end thereof, said elastomer ring being disposed in said rabbet.

Claim 5

Sealing arrangement according to claim 1 wherein the outer periphery of said elastomer ring lies inside of the conical surface defined by the projection of said seating surface and inside of the cylindrical surface defined by axial projection from the periphery of said lip.

Claim 6

Sealing arrangement according to claim 1 wherein the inner periphery of said elastomer ring is cylindrical and the bottom of said groove is also cylindrical and the sides of said groove are planar perpendicuLar to the axis of said piston.

Claim 7

Sealing arrangement according to claim 1 wherien said sealing ring is made of ''''Teflon'''' and is cured in situ, and said elastomer ring is a rubber O-ring.

Claim 8

Sealing arrangement comprising a vlave closure a conical metal seating surface on said clsoure, an annular groove around said closure adjacent the largest diameter part of said seating surface, said groove having a cylindrical bottom and planar sides, a Teflon seal ring in said groove, said ring having a cylindrical inner periphery and planar sides, said ring having at its outer periphery adjacent said seating surface a conical outer periphery having the same diameter adjacent said seating surface as the adjacent part of said seating surface and a larger taper angle than said seating surface forming at the largest diameter part of said conical outer periphery a protuberant lip, said ring having a rectangular section annular rabbet at the outer periphery of the ring adjacent said conical outer periphery of the ring, and a rubber O-ring disposed in said rabbet in compression between and sealing between the rabbetted part of said Teflon ring and the adjacent planar side of said groove, said groove being at least as deep as the depth of said O-ring when compressed therein.

Claim 9

Sealing arrangement comprising a vlave closure a conical metal seating surface on said clsoure, an annular groove around said closure adjacent the largest diameter part of said seating surface, said groove having a cylindrical bottom and planar sides, a Teflon seal ring in said groove, said ring having a cylindrical inner periphery and planar sides, said ring having at its outer periphery adjacent said seating surface a conical outer periphery having the same diameter adjacent said seating surface as the adjacent part of said seating surface and a larger taper angle than said seating surface forming at the largest diameter part of said conical outer periphery a protuberant lip, said ring having a rectangular section annular rabbet at the outer periphery of the ring adjacent said conical outer periphery of the ring, and a rubber O-ring disposed in said rabbet in compression between and sealing between the rabbetted part of said Teflon ring and the adjacent planar side of said groove, said groove being at least as deep as the depth of said O-ring when compressed therein.

Claim 10

Sealing arrangement for a valve, comprising a tapered seat, a closure having a tapered seating surface adapted to engage said seat, a semi-rigid seal ring carried by said closure adjacent the largest diameter part of said seating surface and having a tapered outer periphery including a protuberant lip adapted to engage said seat, and elastomer means adjacent the lip of said seal ring adapted to seal between said ring and said closure to prevent ring enlargement.

Claim 11

Sealing arrangement for a valve, comprising a tapered seat, a closure having a tapered seating surface adapted to engage said seat, a semi-rigid seal ring carried by said closure adjacent the largest diameter part of said seating surface and having a tapered outer periphery including a protuberant lip adapted to engage said seat, and elastomer means adjacent the lip of said seal ring adapted to seal between said ring and said closure to prevent ring enlargement.

Claim 12

Sealing arrangement according to claim 8 wherein said seat is annular and said closure includes a projecting portion extending through said seat, said elastomer means sealing said ring to said closure preventing fluid expansion of said seal ring when travel of said projecting portion is blocked preventing full engagement of said closure and seat.

Claim 13

Sealing arrangement comprising a semi-rigid seal ring having an inner periphery, an outer periphery, and two annular oppositely facing sides interconnecting said inner and outer periphery, a supporting member having an inner portion extending coaxially within said inner periphery, said supporting member having a first side portion alongside one of said sides of said seal ring, said outer periphery of the seal ring flaring away from said first side portion of the supporting member, said first side portion of the supporting member having an outer periphery flaring toward said seal ring and forming a continuation of said outer periphery of said seal ring, the flare of said outer periphery of said seal ring being greater than that of said outer periphery of said seal ring, said supporting member having a second side portion alongside the other of said sides of the seal ring, and an elastomer ring means disposed under compression between said second side portion of said supporting member and the adjacent portion of said seal ring to seal between said seal ring and supporting member to prevent fluid pressure entering therebetween and acting outwardly on said seal ring tending to expand the ring radially away from said supporting member.

Claim 14

Sealing arrangement comprising a semi-rigid seal ring having an inner periphery, an outer periphery, and two annular oppositely facing sides interconnecting said inner and outer periphery, a supporting member having an inner portion extending coaxially within said inner periphery, said supporting member having a first side portion alongside one of said sides of said seal ring, said outer periphery of the seal ring flaring away from said first side portion of the supporting member, said first side portion of the supporting member having an outer periphery flaring toward said seal ring and forming a continuation of said outer periphery of said seal ring, the flare of said outer periphery of said seal ring being greater than that of said outer periphery of said seal ring, said supporting member having a second side portion alongside the other of said sides of the seal ring, and an elastomer ring means disposed under compression between said second side portion of said supporting member and the adjacent portion of said seal ring to seal between said seal ring and supporting member to prevent fluid pressure entering therebetween and acting outwardly on said seal ring tending to expand the ring radially away from said supporting member.

Claim 15

Sealing arrangement comprising a valve closure an annular tapered metal seating surface on said closure, an annular groove around said closure adjacent said tapered seating surface, said tapered seating surface flaring toward said groove, a semi-rigid seal ring carried by said closure having its inner periphery lying in said groove, said ring having at its outer periphery adjacent said seating surface a tapered outer periphery flaring in the same direction as said tapered seating surface but with greater angularity forming At the largest diameter part of said tapered outer periphery of the ring a protuberant lip, and an annular elastomer seal means in said groove between the side of said ring nearest the lip thereof and the adjacent side of said groove to prevent fluid from getting to a surface on said ring where it can exert a radially outward pressure on said ring tending to expand the ring.

Claim 16

Sealing arrangement comprising a valve closure an annular tapered metal seating surface on said closure, an annular groove around said closure adjacent said tapered seating surface, said tapered seating surface flaring toward said groove, a semi-rigid seal ring carried by said closure having its inner periphery lying in said groove, said ring having at its outer periphery adjacent said seating surface a tapered outer periphery flaring in the same direction as said tapered seating surface but with greater angularity forming At the largest diameter part of said tapered outer periphery of the ring a protuberant lip, and an annular elastomer seal means in said groove between the side of said ring nearest the lip thereof and the adjacent side of said groove to prevent fluid from getting to a surface on said ring where it can exert a radially outward pressure on said ring tending to expand the ring.