The present invention provides a shaft-cylinder assembly for high-temperature operation comprising a dynamic sealing member having a helical coiled seal ring structure configured to be in contact with the shaft for providing dynamic sealing function; and a cylindrical cooling jacket positioned between the dynamic sealing member and the cylinder, and configured to circumferentially surround the dynamic sealing member and be circumferentially surrounded by the cylinder; wherein the cooling jacket includes one or more cooling channels, each of the one or more cooling channels is configured to circulate a cooling fluid for moving heat away from the dynamic sealing member.

A reciprocating compressor including a compressor frame including a drive shaft received therein, a rotary to linear motion converter coupling the drive shaft and a first end of a piston rod, a piston coupled to a second end of the piston rod, a compression cylinder in which the piston is received, an inlet valve coupled to the compression cylinder and a discharge valve coupled to the compression cylinder, a pressure casing encasing the compressor frame and the rotary to linear motion converter, a motor coupled to the drive shaft, wherein the motor is located external to the pressure casing, and a mechanical seal coupled between the drive shaft and the pressure casing.

An annular seal assembly for use in a fluid mover, such as a compressor, having a tangentially-cut ring assembly and a radially-cut ring assembly, each ring assembly having arcuate segments, where each arcuate segment of the tangentially-cut ring assembly has a plurality of passages extending from the outer peripheral face to within at least 1.0 mm of the inner peripheral face, wherein after wearing in of the seal, the passages extend through the tangentially-cut ring assembly for pressure balancing.

An oil wiper packing for a piston rod of a crosshead piston compressor, and corresponding assembly method. The oil wiper packing has at least one chamber disc having a chamber disc cutout, wherein a wiper ring arranged in the chamber disc cutout. At least two chamber discs, each having a chamber disc cutout, are arranged in succession in a direction of extent (L), and a single wiper ring is in each chamber disc cutout. Each wiper ring has no play or only negligible play in the direction of extent (L) in the operating state but is movable in the radial direction. It is necessary to set the play in in the cold state during the assembly of the wiper rings. Such an arrangement allows advantageous wiping of oil, preventing oil from spreading in the direction of extent of the piston rod.

An annular seal assembly for use in a fluid mover, such as a compressor, having a tangentially-cut ring assembly and a radially-cut ring assembly, each ring assembly having arcuate segments, where each arcuate segment of the tangentially-cut ring assembly has a plurality of passages extending from the outer peripheral face to within at least 1.0 mm of the inner peripheral face, wherein after wearing in of the seal, the passages extend through the tangentially-cut ring assembly for pressure balancing.

The present invention provides a shaft-cylinder assembly for high-temperature operation comprising a pair of first and second dynamic sealing members having a helical coiled seal ring structure configured to be in contact with the shaft for providing dynamic sealing function in the cylinder; and a cylindrical cooling jacket configured to circumferentially surround the dynamic sealing members such that a cavity is defined between the dynamic sealing members inside the cooling jacket; wherein the cooling jacket comprises one or more inflow cooling channels and one or more outflow cooling channels configured to communicating with the cavity and circulating a cooling fluid through the cavity for moving heat away from the dynamic sealing members.

The present invention is directed to a piston rod sealing system for a reciprocating machine (1), the system comprising: a piston rod (8) having a first end (8a) connected to a piston (9), and a second end (8b) connected to a crankshaft (10), the piston rod (8) being received within a housing (7); a sealing unit (11) provided between the piston rod (8) and the housing (7), and comprising a first lateral surface (12a) facing the first end (8a) and a second lateral surface (12b) facing the second end (8b);
wherein the sealing unit (11) comprising a first rod seal (13) positioned in the vicinity of the first lateral surface (12a) and a second rod seal (14) positioned between the first rod seal (13) and the second lateral surface (12b), said sealing unit (11) being fixed within the housing (7); the second rod seal (14) comprises a liquid injection pipe (15).

A packing case assembly includes a packing cup configured to be disposed along a piston rod of a reciprocating gas compressor system; and a packing ring set disposed in the packing cup, the packing ring set including multiple rings. The packing ring set is configured to be disposed circumferentially around a portion of the length of the piston rod. A backup packing ring of the packing ring set includes a first region including a polymer, and a second region including a metal.

A seal assembly for a piston rod including an external seal and an internal seal. The external seal is adapted to be placed on a piston rod facing an external environment, the internal seal is adapted to be placed on the rod facing the cylinder associated to the piston. The external and internal seals define in cooperation with each other a chamber for the containment of barrier fluid. Such chamber has an inlet for the intake of barrier fluid and an outlet for the exit of barrier fluid. The assembly also comprises a recirculation circuit for the barrier fluid, which is placed in fluid communication with the inlet and the outlet to recirculate the barrier fluid from the outlet back to the inlet and a pressurizer device configured to be installed coaxially with the piston rod providing the chamber with a positive pressure with respect to the process environment.

A sealing assembly for a fluid end of a reciprocating pump is installable within a segment of a casing of the fluid end and is arranged to form a seal with the segment. The sealing assembly includes a closure element and a seal element. The closure element has a sealing portion with a lateral surface that faces an interior wall of the segment of the fluid end. The seal element is sized to be installed around the closure element and includes a seal and one or more seal carriers. The seal is configured to form a seal between the lateral surface of the closure element and the interior wall of the segment. The one or more seal carriers are configured to position the seal with respect to the closure element.