Pipe joints and more particularly circular push-on type pipe joints including a flexible gasket having both hard and soft sections and where the hard section has a chamfered outer edge and a C-shaped grooved portion on a side opposite of the chamfered outer edge in which a portion of the soft section fills and is connected to and the soft section is configured to partially overlap a flange on an interior surface of a pipe bell end.

Pipe joints and more particularly circular push-on type pipe joints including a flexible gasket having both hard and soft portions and where the soft portion overlaps a flange and an inner curved section of the hard portion.

Pipe apparatus can include a coupling device with a seal circumscribing a central axis. The seal further includes a first circumferential pocket at least partially defined by a first and second circumferential flange. A fluid guide device positioned at least partially within the first circumferential pocket includes a plurality of segments that are radially arranged to circumscribe the central axis. The fluid guide device at least partially defines a fluid path. Methods can include using the coupling device to couple a first end portion of a first pipe segment to a second end portion of a second pipe segment. Methods of using the pipe apparatus can include passing fluid through the fluid path to cool the seal.

An annular gasket includes an annular body; an annular body; a pair of sealing ribs each extending substantially radially inwardly from the annular body and having an innermost radial extent; and at least one center rib extending substantially radially inwardly from the annular body, the at least one center rib having an innermost radial extent closer to the annular body than the innermost radial extent of each of the pair of sealing ribs.

An annular gasket includes an annular body; an annular body; a pair of sealing ribs each extending substantially radially inwardly from the annular body and having an innermost radial extent; and at least one center rib extending substantially radially inwardly from the annular body, the at least one center rib having an innermost radial extent closer to the annular body than the innermost radial extent of each of the pair of sealing ribs.

Pipe apparatus can include a coupling device with a seal circumscribing a central axis. The seal further includes a first circumferential pocket at least partially defined by a first and second circumferential flange. A fluid guide device positioned at least partially within the first circumferential pocket includes a plurality of segments that are radially arranged to circumscribe the central axis. The fluid guide device at least partially defines a fluid path. Methods can include using the coupling device to couple a first end portion of a first pipe segment to a second end portion of a second pipe segment. Methods of using the pipe apparatus can include passing fluid through the fluid path to cool the seal.

A ring-shaped gasket has a body, and a wing that deflects at least a portion of the stress of compression from the axial center of the ring seal. The wing compresses in both the axial and the radial direction when tightened between seal surfaces. When the wing is further compressed, the portion of the wing contacting the seal surface moves in a radial direction from farther away from the center of the ring seal to closer to the center of the ring seal. The outer radial surface of the ring seal has a wing trough and a central trough separated by a peak. The troughs may have a V-shape a U-shape, or may have a regular arrangement of blind cavities projecting into either one or both of the axial end surfaces.

A ring-shaped gasket has a body, and a wing that deflects at least a portion of the stress of compression from the axial center of the ring seal. The wing compresses in both the axial and the radial direction when tightened between seal surfaces. When the wing is further compressed, the portion of the wing contacting the seal surface moves in a radial direction from farther away from the center of the ring seal to closer to the center of the ring seal. The outer radial surface of the ring seal has a wing trough and a central trough separated by a peak. The troughs may have a V-shape a U-shape, or may have a regular arrangement of blind cavities projecting into either one or both of the axial end surfaces.