초록 ▼

A disconnectable union for fluid piping is provided in which a pre-load dependent first seal between disassemblable union members is coaxially related to a second seal operable independently of the pre-loading of the first seal such that the second seal independently contains any fluid that comes in

A disconnectable union for fluid piping is provided in which a pre-load dependent first seal between disassemblable union members is coaxially related to a second seal operable independently of the pre-loading of the first seal such that the second seal independently contains any fluid that comes in contact with it even if such fluid contact is due to diminution of the pre-loading of the first seal. Various flange joint configurations and seal constructions are disclosed for both plastic lined and unlined metal pipe.

대표청구항 ▼

A disconnectable pipe union comprising in combination first and second union members, means for establishing between said union members a first circumferential seal whose sealing effectiveness is a function of its pre-loading and which is fluid-tight when pre-loaded above a given level, means constr

A disconnectable pipe union comprising in combination first and second union members, means for establishing between said union members a first circumferential seal whose sealing effectiveness is a function of its pre-loading and which is fluid-tight when pre-loaded above a given level, means constructed and arranged to be placed under tension to draw said first and second union members toward each other to provide at least said given level of pre-loading for said first seal, said union members being related to said means for establishing a first seal such that at least corresponding portions of said union members radially outward of said first seal remain separated axially with at least a certain minimum gap therebetween when the union members are drawn together with said first seal established therebetween, axially extensible sealing means constructed and arranged to be separably fastened to both of said union members for establishing a second fluid-tight circumferential seal within said gap surrounding concentrically said first seal and operative independently of said pre-loading at least to contain any fluid leaking past said first seal due to diminution of said pre-loading below said given level anywhere circumferentially around said first seal, and means for establishing a separable reusable connection between said union members and the corresponding end of said axially extensible sealing means.