Coupling gaskets and associated methods
Coupling devices for joining pipe ends include annular gaskets. Example gaskets include pipe interface profiles for sealing performance and manufacturability.
1. An asymmetrical annular gasket comprising:
a substantially L-shaped housing interface portion defining a first leg and a second leg;
a pipe sealing portion extending from said first leg and including a tapered rib extending from the pipe sealing portion, the tapered rib when not engaged having a substantially horizontal component surface extending in a substantially axial direction, a declined component surface intersecting the substantially horizontal component surface, a radius section intersecting the substantially horizontal component surface and extending at least partially radially inward from the substantially horizontal component surface, and a declined section extending radially inwardly from the radius section at a different angle than the radius section, the declined component surface when not engaged extending at least partially radially outward from the substantially horizontal component surface and intersecting a horizontal section having a surface extending in a substantially axial direction; and
a flange sealing portion extending from said second leg.
2. The annular gasket of claim 1 , wherein the declined component surface and the substantially horizontal component surface of the tapered rib have different lengths.
3. The annular gasket of claim 1 , wherein:
the first leg includes a first surface at one axial side of the annular gasket and extending substantially radially;
the second leg includes a second surface extending substantially axially and facing radially outward;
the pipe sealing portion extends substantially perpendicularly from the first surface; and
the flange sealing portion extends at an angle in a radially inward direction from the second surface.
4. The annular gasket of claim 1 , wherein the horizontal section of the pipe sealing portion is axially outer from the tapered rib when not engaged.
5. The annular gasket of claim 4 , wherein the horizontal section of the pipe sealing portion is radially outer from the horizontal surface of the tapered rib and intersects an axially outer edge of the pipe sealing portion.
6. The annular gasket of claim 1 , wherein the declined section terminates in a tip at a radially innermost end of the pipe sealing portion.
7. The annular gasket of claim 6 , wherein the horizontal section has a radius equal to a radius of the tip when the gasket engages a pipe outer surface.
8. The annular gasket of claim 6 , further comprising a curved section extending at least partially radially outwardly from the tip opposite the declined section.
9. The annular gasket of claim 1 , wherein the declined section extends from the radius section at an angle between the axial direction and the angle of the radius section.
10. The annular gasket of claim 1 , wherein the substantially horizontal component surface, declined component surface, radius section, and declined section contact a pipe outer surface when the gasket engages the pipe outer surface.
11. The annular gasket of claim 1 , further comprising a vertical sidewall extending radially outward from the substantially horizontal component surface and orthogonal to the substantially horizontal component surface.