Abstract: A reciprocating pump or compressor has an alignment adapter for providing a self-aligning piston rod. The alignment adapter and a clamp couple the piston rod to a crosshead extension rod. The alignment adapter provides compensation for misalignment of the longitudinal axis of the crosshead extension rod with the longitudinal axis of the piston rod. The alignment adapter has a hemispherical cavity, and the piston rod has a hemispherical projection that matingly fits within the hemispherical cavity. A split ring is received in a groove in the piston rod, and the piston rod and the split ring are received in the cavity in the alignment adapter for use in coupling the piston rod to the alignment adapter. A piston head has a hemispherical cavity for receiving a hemispherical projection on a piston rod. The piston head has a longitudinal midpoint, and the hemispherical projection has a focal point for a radius of curvature.

Abstract: An annular seal of the cup packing type having a first annular section formed from a generally non-flexible, generally non-resilient material and having an annular, radially projecting flange portion and a first axially extending skirt portion, and a second annular section having a second axially extending annular skirt portion defining a sealing surface and comprised of a generally flexible, generally resilient material, the second section being generally axially displaced from the flange portion, said first and second skirt portions being adjoined, preferably by bonding to one another.

Abstract: A seal and method of making same wherein a first body is formed with a plurality of parallel, spaced part bores therethrough. A second body is molded onto the first body so that it fills the bores and forms enlarged portions adjacent the ends of the bores, whereby the two bodies are permanently mechanically interlocked.

Abstract: A seal and method of making same wherein a first body is formed with a plurality of parallel, spaced part bores therethrough. A second body is molded onto the first body so that it fills the bores and forms enlarged portions adjacent the ends of the bores, whereby the two bodies are permanently mechanically interlocked.