A sealing assembly for use in a wellbore tool includes thermoplastic materials arranged in a lattice structure to provide a bulk elasticity on the order of elastomeric materials. The lattice structure permits an energizing element of the sealing assembly to deform sufficiently in the elastic range of the thermoplastic materials to provide repeatable sealing capabilities. The lattice structure may be constructed by additive manufacturing processes to include voids therein, which allow the thermoplastic members of the lattice to flex and bend. The energizing element may thereby exhibit a greater elasticity in bulk than the elasticity of the thermoplastic materials themselves. The lattice structure may be enclosed in an outer cover constructed of a polymeric, elastomeric or other material to facilitate the interaction between the seal assembly and the corresponding sealing surfaces of a downhole wellbore tool.

A self-cleaning drum washing machine, comprises a coaxial drum and outer tub. Cleaning particles are arranged between the drum and the outer tub. Structures between the drum and the outer tub opposite to each other are smooth. A flange is fixedly connected to the bottom of the drum; the outer portion of the flange has a smooth structure or an enclosed cavity is arranged on the outer portion of the drum bottom; the flange is arranged in the cavity; a shaft hole is arranged at the center of the cavity; and a drum shaft sticks into the cavity through the shaft hole and is connected to the flange. The smooth structures go against the attachment of dirt, so that the outer wall of the drum and the inner wall of the outer tub can be conveniently cleaned by the cleaning particles.

A valve assembly includes a valve body having a seat-retainer chamber with a floating seat ring disposed adjacent an inner sidewall of the seat-retainer chamber. The floating seat ring is configured to contact a first portion of a plug head at a single annular location prior to a second portion of the plug head contacting a valve primary seat during a closing stroke of the plug head. A static seal is located radially between the floating seat ring and the inner sidewall of the seat-retainer chamber.

A screw compressor includes a screw rotor, a casing, and a delivery side shaft sealing unit. The delivery side shaft sealing unit includes an annular groove, a seal ring, and a shaft sealing fluid supply passage. Pressure of the fluid that is supplied to the one side, in the axial direction, of the seal ring via the shaft sealing fluid supply passage is set higher than pressure that acts on a first side surface, in an axial direction with respect to a first side wall surface of the annular groove, of the seal ring.

A shaft sealing structure includes a plurality of V-packings that are stacked in multiple stages, and each of the V-packings is formed of a thick-walled annular top portion, a thin-walled inner side skirt portion, and a thin-walled outer side skirt portion. Adjacent ones of the top portions abut against each other, adjacent ones of the inner side skirt portions do not interfere with each other, and adjacent ones of the outer side skirt portions do not interfere with each other.

A sealing assembly for a pump includes a header ring having a tapered radially outer surface and a sloped radially inner surface. The assembly also includes a first seal configured to couple to the header ring, the first seal having a groove that receives a bead extending from the header ring. The assembly further includes a second seal axially aligned with the first seal.

A stuffing box assembly for a fluid end of a hydraulic fluid pump includes a first stuffing box member having a first plunger bore configured to receive a plunger of the hydraulic fluid pump and a plurality of seals. The first stuffing box member further comprises a first bore spaced apart from the plunger bore. A second stuffing box member has a threaded stuffing nut bore configured to receive a stuffing nut of the hydraulic fluid pump. The second stuffing box member further comprises a second bore spaced apart from the stuffing nut bore. A fastener is configured to extend through the first and second bores to secure the first stuffing box member to the second stuffing box member.

A stuffing box assembly for a fluid end of a hydraulic fluid pump includes a first stuffing box member having a first plunger bore configured to receive a plunger of the hydraulic fluid pump and a plurality of seals. The first stuffing box member further comprises a first bore spaced apart from the plunger bore. A second stuffing box member has a threaded stuffing nut bore configured to receive a stuffing nut of the hydraulic fluid pump. The second stuffing box member further comprises a second bore spaced apart from the stuffing nut bore. A fastener is configured to extend through the first and second bores to secure the first stuffing box member to the second stuffing box member.

A butterfly valve seal arrangement in a butterfly valve having a cylindrical flow channel with a wall includes a seal flange, an elastomeric seal, a seal channel, and an annular seal retaining ring. The seal flange extends into the cylindrical flow channel from the wall of the cylindrical flow channel. The seal channel is recessed into the wall of the cylindrical flow channel adjacent to the seal flange. And the annular seal retaining ring includes tabs extending into the seal channel which hold the annular seal retaining ring in the cylindrical flow channel. An elastomeric seal is held in compression in the seal channel and against the seal flange by the annular seal retaining ring, and extends into the cylindrical flow channel forming a seal surface held in compression against a vane seat of a vane in a position perpendicular to a direction of flow.

A rotary seal comprising: a shaft with a chromium oxide coating provided at a seal contact area; wherein said coating has a hardness of at least 55 Rockwell-C. The coating may have a surface roughness parameter (Ra) of between 0.2 and 0.4 circular. The coating may have a thickness of at least 0.1 mm. The coating layer forms part of a rotary seal with a flexible seal element that is biased into contact with the surface of the coating. The flexible seal element may be biased against the shaft by a spring to increase the pressure of the flexible seal element against the coating. The coating is preferably deposited by a plasma spray process.