| 摘要 |
A set of piston rod packing rings for use in each of the packing cups of a gas compressor is disclosed. The packing ring set includes segmented first and second rings constructed of a material such as plastic, nylon, Teflon or bronze. The segments of the first ring have a plurality of opposing ends, each of which plurality preferably forms a radial cut butt joint. The segments of the second ring also have a plurality of opposing ends, each of which plurality preferably forms a butt/tangent joint. The second ring is disposed next to and on a low pressure side of the first ring as measured during a compressor piston rod compression stroke. The packing ring set also includes a third uncut ring constructed of a compressible, non-metallic material and a fourth uncut, anti-extrusion ring constructed of a relatively less compressible material than the third ring such as cast iron, bronze or hard plastic. The first and second rings may each have either a garter spring or a wire disposed endlessly around an outer peripheral edge thereof to hold the same in compression on the piston rod to provide an initial operative gas seal on the rod during start up of the compressor and activation of a compression stroke of the piston rod.
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