Conductive insert for gasket
A part of a gasket that conducts electricity across the otherwise nonconducting gasket. Versions of the insert provide an electrical connection when installed even if the parts sealed by the gasket deflect, and do not deform under compression due to their resilient nature. The gaskets can be used in pipe joints, among other uses, resulting in a pipe joint that conducts electricity between the pipe spigot and the socket of a pipe or fixture even if a deflection event occurs.
1. A gasket for providing an electrically conductive connection between two pipes, the gasket having an inner radial surface and an outer radial surface, and comprising:
(a) a resilient sealing bulb;
(b) a rigid gasket heel connected to the sealing bulb, the gasket heel comprising a groove on the outer radial surface and a retainer on the outer radial surface opposite the sealing bulb; and
(c) a plurality of conductive bodies, each forming a majority of the surface of the groove.
2. The gasket of claim 1 , comprising a slope on the radially inner surface of the gasket tapering in an axial direction, and wherein the conductive bodies each form a majority of the surface of the slope.
3. The gasket of claim 1 , wherein the conductive bodies each form a majority of the surface of the heel.
4. The gasket of claim 1 , wherein the conductive bodies form no more than a minority of the surface of the retainer.
5. The gasket of claim 1 , wherein the conductive bodies form no significant portion of the surface of the retainer.
6. The gasket of claim 1 , wherein the conductive bodies are generally U-shaped.
7. The gasket of claim 1 , wherein the conductive bodies are generally U-shaped, the U having a first stem, an aperture, and a second stem, and wherein the aperture is filled with a resilient material.
8. The gasket of claim 1 , wherein each of said conductive bodies is constructed mostly of a conductive metal.
9. The gasket of claim 1 , wherein each of said conductive bodies comprises copper.
10. The gasket of claim 1 , wherein each of said conductive bodies comprises 99.9% copper.
11. The gasket of claim 1 , wherein each of said conductive bodies has an electrical conductivity of at least 30 MS/m.
12. The gasket of claim 1 , wherein each of said conductive bodies has an electrical conductivity of about 60 MS/m.
13. The gasket of claim 1 , wherein the conductive bodies have a hardness of no more than about the hardness of C11000 ETP copper.
14. The gasket of claim 1 , wherein the conductive bodies have a hardness that is sufficiently low to prevent the conductive bodies from cutting into the bulb portion.
15. The gasket of claim 1 , wherein the conductive bodies have a hardness below about 120 Vickers Pyramid Number (HV).
16. The gasket of claim 1 , wherein said gasket conducts at least 600 A (5 min).
17. The gasket of claim 1 , wherein the sealing bulb is constructed of an elastomeric material having a hardness of about 50-65 Durometer Shore A.
18. The gasket of claim 1 , wherein the gasket heel is constructed of a polymeric material having a hardness of about 80-85 Durometer Shore A.
19. The gasket of claim 1 , wherein the gasket heel's hardness exceeds the sealing bulb's hardness.
20. A conductive pipe joint, the joint comprising:
(a) a first pipe having a socket end;
(b) a second pipe have a spigot end; and
(c) the gasket of claim 1 between the outer surface of the spigot end and the inner surface of the socket end.
21. An insert to provide conductivity across a gasket between a first pipe and a second pipe, the insert comprising:
(a) a U-shaped conductive body having a first stem with a first exterior surface, a second stem with a second exterior surface, and a space between the first stem and second stem;
(b) a non-compressible body adjoining a portion of the second exterior surface; and
(c) a compressible body filling the space between the first stem and the second stem, wherein the first exterior surface and the compressible body define at least partially radial inner surface of the insert, and the second exterior surface and the non-compressible body at least partially form a radial outer surface of the insert, and further wherein the radial outer surface comprises a groove defined in major part by the second exterior surface.
22. An insert to provide conductivity to a gasket, the insert having a radial outer surface defined in part by a groove and a radial inner surface, and comprising:
(a) a conductive body roughly in the shape of a U formed by a first stem, a second stem, and an aperture between the first and second stems, wherein the first stem forms a majority of the groove's surface, the second stem forms a majority of the radial inner surface;
(b) a retainer body along the radial outer surface and adjoining the first stem; and
(c) a compressible resilient body in the aperture of the U.