A fluid cylinder for a fluid end section of a reciprocating pump is described. The fluid cylinder includes a body defining a pressure chamber in fluid communication with a plunger bore, the plunger bore comprising a packing segment configured to hold a packing stack, and a tubular sleeve in interference-fit within the plunger bore. The sleeve has an internal passage configured to accommodate a plunger operatively reciprocating within the plunger bore during operation of the reciprocating pump, and a stepped shoulder disposed at an interface between a first segment of the sleeve and a second segment of the sleeve, where a diameter of the first segment being greater than a diameter of the second segment of the sleeve. An annular seal is disposed at the stepped shoulder f the sleeve between the sleeve and the plunger bore. A packing flange is secured within the plunger bore abutting an end portion of the first segment of the sleeve.

An oil passage structure, includes a first tubular member configured to externally fit on a support wall portion and a second tubular member configured to internally fit in the support wall portion and supports an outer periphery of the shaft. An oil passage along a rotation axis direction of the shaft is provided at at least one of a location between the support wall portion and the first tubular member and a location between the support wall portion and the second tubular member.

A packing case for a plunger or a piston rod of a reciprocating machine comprises packing cups, each packing cup comprising a body with a hole for the passage of the plunger or rod and a sealing ring seat for housing a sealing ring which slidably bear against the plunger or rod. Packing cups are aligned with each other in series. The packing case comprises lube oil ducts for supplying lube oil from an end of the packing case to the sealing ring seat. Each packing cup comprises sectors, each sector comprising at least lube oil duct portions. The packing cups are positionable to bring, one sector at a time in an activation position where some of the lube oil duct portions of the sector are connected with the lube oil duct portions of an adjacent packing cup to form lube oil ducts. The packing cups are lockable.

A stuffing box for sealing a top opening of a vertical pump, including: a housing with a vertical tube for rotatably disposing a shaft of the vertical pump, an annular bearing that: divides the vertical tube in a lower half and an upper half, and fills an annular space between an inner wall of the vertical tube and the shaft, such that as less fluid as possible passes from the lower half through the annular bearing to the upper half, an outlet pipe for discharging the fluid passing through the annular bearing.

A fluid sealing system for a rotary mechanical device including a pillar lantern ring having a bottom and a top end cap with pillars or columns connecting the end caps is formed by additive manufacturing. The bottom annular end cap has an outside face and an opposed inside face defining a height therebetween and the upper annular end cap has an inside face and an opposed outside face defining a height therebetween with a plurality of integrally formed substantially cylindrical axial columns connecting the two opposed inside faces of the two end caps.

One or more techniques and/or systems are disclosed for mitigating fluid loss or leakage from a fluid pump with a rotating shaft driving a pumping mechanism. A one-piece, combined packing gland-bushing component can have an internal seal that allows for use of lubricants at higher pressures. Further, the combined packing gland-bushing component can be configured with a removal component that allows for easier removal of the packing gland-bushing component from a pump shaft, and shaft packing box.

An electric submersible pump includes a pump, an electric motor that is coupled to the pump by a rotatable shaft, a seal section that is positioned between the pump and the electric motor. The seal section contains an additive and a motor oil for the electric motor. The additive includes one or more superabsorbent polymers or imidate salts to contact the motor oil and to react with a wellbore fluid from a wellbore to prevent premature failure of the electric submersible pump from the wellbore fluid contamination of the motor oil.

Provided is a sliding component capable of reducing the frictional resistance of a sliding surface entailing eccentric rotation. A sliding component is formed in an annular shape and has a sliding surface relatively sliding with eccentric rotation. A plurality of grooves not communicating with spaces on the inner and outer diameter sides of the sliding component are circumferentially provided in the sliding surface.

Provided is a sliding component capable of reducing the frictional resistance of a sliding surface entailing eccentric rotation. A sliding component is formed in an annular shape and has a sliding surface relatively sliding with eccentric rotation. A plurality of grooves not communicating with spaces on the inner and outer diameter sides of the sliding component are circumferentially provided in the sliding surface.

A mechanical sealing device includes rotating and stationary rings, and rotating and stationary ring adaptors mounted around a rotating shaft. An end surface of the rotating ring adjoins an end surface of the stationary ring by means of springs. The sealing interface includes an adjoining point that is in contact with a liquid medium in an axial section of the device, and an annular peripheral rim surrounding the rotating and stationary rings for agitating the liquid medium. At least a part of the peripheral rim is formed with an inclined surface oriented toward the adjoining point, the inclined surface defining a start point close to the adjoining point and an end point away from the adjoining point in the axial section of the device. The start point is spaced apart from the adjoining point while the end point extends not beyond the adjoining point in the axial direction.