Patent ID: 8100407

Claim:
A plunger pump comprising: a packing bore for a reciprocating plunger, wherein the packing bore has a generally cylindrical interior wall and a seat and a removable gland, and; a packing cartridge wherein the packing cartridge comprising: a. a generally-cylindrical sleeve having an outer cylindrical profile least partially positioned in the packing bore; b. a first abutment ring positioned in the sleeve; c. a second abutment ring positioned in the sleeve and co-axially spaced apart from the first abutment ring; d. telescoping structures operatively positioned between the first abutment ring and the second abutment ring to allow for squeezing of the first abutment ring and second abutment ring co-axially closer to one another while the telescoping structures are free to rotate relative to one another as the abutment rings are axially squeezed; and e. a retaining ring operatively positioned between the telescoping structures to retain the telescoping structures together and to allow for squeezing of the first abutment ring and second abutment ring co-axially closer to one another, wherein the telescoping structures would not be axially retained together in the absence of the removable gland and the retaining ring; wherein the packing cartridge is positioned in the packing bore between the seat and the removable gland so that the squeezing of the first abutment ring and the second abutment ring closer together is provided by the tightening the removable gland over the packing cartridge.