Anti-blowout seal

Claim 1

A seal for pressurized fluid systems adapted to establish a seal between a first cylindrical member received within a second member having a cylindrical opening, the second member having an annular concentric recess intersecting said opening wherein the seal is located within the annular recess, the recess being defined by radial sides and a base surface, the seal being characterized by its resistance to being blown out of the recess by pressurized fluid comprising, in combination, an annular body of semi-rigid synthetic plastic material having an inner cylindrical bore sealingly engageable with the first cylindrical member and having an axis, axially spaced radially extending sides spaced apart a distance slightly less than that separating the recess sides, and an outer circular circumference radially spaced from said bore a distance slightly less than the radial depth of the recess whereby said body substantially fills the second member recess and the recess confines said body from significant radial and axial movement therein, an annular ring recess defined in said body outer circumference intermediate said body sides and concentric to said body axis, said ring recess being defined by radially extending sides intersecting said body circumference and a bottom surface, the radial dimension of said body from said inner bore to said ring recess bottom surface being at least as great as the radial depth of said ring recess from said body outer circumference to said ring recess bottom surface, and an annular elastomeric seal ring within said ring recess having a radial cross-sectional dimension greater than the radial depth of said ring recess whereby said seal ring engages the recess base surface and said body bore sealingly receives the first cylindrical member.