Piston or like sealing or packing

Claim 2

A rsealing ring, for use as a fluid packing in a circumferential groove in one of opposed cylindrical surfaces to be sealed, comprising a moulded ring of elastomeric material with inner and outer circumferential sealing contact bands to seal against opposed surfaces, the sealing ring being substantially of V-shape in radial axial section, so that it has a radiallydirected apex portion forming a circumferential sealing contact band at one radial periphery of the ring, as viewed in said radial axial section, and a pair of oppositely obliquely-inclined circumferential flanges which diverge from the apex portion and extend to further peripheries at the other radial periphery of the ring opposite from said one radial periphery, each said flange having on the axially outer side thereof a lateral, axially-directed, sealing contact band near the said further periphery of its respective flange, and wherein each said flange has open recesses through the radial edge of its respective further periphery beyond its respective lateral sealing contact band for axial passage of fluid past the flange.

Claim 3

A sealing ring according to claim 1 including a step formed between each said further periphery and its respective lateral sealing contact band.

Claim 4

A sealing ring according to claim 1 in combination with a groove in a cylindrical surface to be sealed wherein said lateral sealing contact bands are arranged to seal only against a respective wall of the groove and the said further peripheries of the flanges do not seal against the base of the groove.

Claim 5

In combination with a member having a cylindrical surface and a circumferential groove in said surface, a sealing ring in said groove to serve as a fluid-tight packing for said cylindrical surface against a relatively movable opposed cylindrical surface, said sealing ring being of elastomeric material substantially of V-shape in radial axial section and having an apex portion with a circumferential sealing contact band radially directed outwardly from the mouth of said groove and a pair of oppositely obliquely-inclined flanges which diverge from said apex portion, each said flange having on its axially outer side thereof, a lateral, axially-directed, sealing band to contact the opposed respective side of said groove, said flanges having peripheral edge portions at their radial ends opposite from said apex portion, said lateral, axially-directed sealing bands being located, radially, between the apex portion and the said peripheral edge portions, said sealing ring being positively radially located in said groove by operative seating of said peripheral edge portions with the base of the groove, said base and said peripheral edge portions having a means for providing a passageway for the axial transfer of fluid past the said peripheral edge portions of the flanges.

Claim 6

In combination with a member having a cylindrical surface and a circumferential groove in said surface, a sealing ring in said groove to serve as a fluid-tight packing for said cylindrical surface against a relatively movable opposed cylindrical surface, said sealing ring being of elastomeric material substantially of V-shape in radial axial section and having an apex portion with a circumferential sealing contact band radially directed outwardly from the mouth of said groove and a pair of oppositely obliquely-inclined flanges which diverge from said apex portion, each said flange having on its axially outer side thereof, a lateral, axially-directed, sealing band to contact the opposed respective side of said groove, said flanges having peripheral edge portions at their radial ends opposite from said apex portion, said lateral, axially-directed sealing bands being located, radially, between the apex portion and the said peripheral edge portions, said sealing ring being positively radially located in said groove by operative seating of said peripheral edge portions with the base of the groove, said base and said peripheral edge portions having a means for providing a passageway for the axial transfer of fluid past the said peripheral edge portions of the flanges.

Claim 7

The combination of claim 4 including a step formed between each peripheral edge portion and its respective, lateral, axially-directed sealing band.

Claim 8

A combination according to claim 4, wherein said means for providing a passageway comprises open recesses formed through the radial edge of each respective peripheral edge portion.

Claim 9

A combination according to claim 4, wherein means for providing a passageway comprises open recesses formed into the base of the groove for the passage of fluid therethrough.