Systems and methods include providing an annular seal stack for an assembly. The seal stack is disposed within an annulus formed between a probe and a housing of the assembly and configured to provide a radial seal between the probe and the housing. The seal stack includes a first support retainer, a first lipseal, a first seal support system comprising at least one support ring disposed between the first support retainer and the first lipseal, a second support retainer configured to support the first lipseal, a second lipseal, a second seal support system comprising at least one support ring disposed between the second support retainer and the second lipseal, and a third support retainer configured to support the second lipseal.

A maintenance tool apparatus for servicing a stuffing box for a wellhead having an upright arm coupled to a portion of the wellhead at one end and an elongate arm coupled to another end of the upright arm. The elongate arm having a resting end configured to rest on a polish rod of the wellhead. Also, a method for servicing a stuffing box for a wellhead has the steps of: placing a resting end of a maintenance apparatus against a polish rod; uncoupling at least one of a packing gland and a dust cover from a stuffing box; sliding the packing gland and the dust cover along the polish rod above the resting end of the maintenance apparatus; maintaining the position of the packing gland and the dust cover; and repacking the stuffing box.

A maintenance tool apparatus for servicing a stuffing box for a wellhead having an upright arm coupled to a portion of the wellhead at one end and an elongate arm coupled to another end of the upright arm. The elongate arm having a resting end configured to rest on a polish rod of the wellhead. Also, a method for servicing a stuffing box for a wellhead has the steps of: placing a resting end of a maintenance apparatus against a polish rod; uncoupling at least one of a packing gland and a dust cover from a stuffing box; sliding the packing gland and the dust cover along the polish rod above the resting end of the maintenance apparatus; maintaining the position of the packing gland and the dust cover; and repacking the stuffing box.

Systems and methods include providing an annular seal stack for an assembly. The seal stack assembly is disposed between a probe and a housing of the assembly and configured to provide a radial seal between the probe and the housing. The seal stack assembly includes a first metallic seal, a second metallic seal, and a wiper assembly disposed between the first metallic seal and the second metallic seal. The wiper assembly includes a first wiper housing component having a tapered inner surface, a second wiper housing component having a tapered inner surface opposite the tapered inner surface of the first wiper housing component, and a wiper disposed between the first wiper housing component and the second wiper housing component.

An apparatus for restricting flow of a fluid along a shaft passing through the apparatus while permitting the shaft to freely rotate can include a housing, a gland follower, a fastening mechanism, and a biasing mechanism. The gland follower may include a center aperture for receiving the shaft and at least one fastening aperture. When installed, the fastening mechanism mechanically couples the gland follower to the housing to define a cavity in conjunction with a recess within the housing. Also, the biasing mechanism generates a predetermined force when installed that biases the gland follower towards the housing in a direction parallel to an axis of rotation of the shaft. The predetermined force can be translated into a force that deforms packing material inserted into the cavity to provide sealing engagement with the shaft.

A method for handling a product, in particular a viscous, pasty product, with at least one rotating shaft (3, 11) in a product space (5), a driving spindle (11) of the shaft (3) is mounted and sealed outside the product space (5) in a housing consisting of a plurality of parts (7, 8, 12). The sealing is brought about by at least two seals (2, 4), wherein a dynamic seal (2) follows an eccentric movement of the shaft (3) and takes on dynamic sealing of the rotating shaft (3), while another seal (4) compensates for an eccentric movement of the shaft (3) in relation to the housing by plastic or elastic deformation and therefore prevents a leakage between the housing part (12), which moves eccentrically, and a rigid housing (10). A defined quantity of liquid, which serves as a blocking agent and lubricant for the dynamic seal (2) of the shaft (3) towards the housing part (7), is metered in here, the liquid, apart from a residual excess, being drawn into the dynamic seal (2) by a pressure difference therewithin and thereby forming an effective block and seal.

A method for handling a product, in particular a viscous, pasty product, with at least one rotating shaft (3, 11) in a product space (5), a driving spindle (11) of the shaft (3) is mounted and sealed outside the product space (5) in a housing consisting of a plurality of parts (7, 8, 12). The sealing is brought about by at least two seals (2, 4), wherein a dynamic seal (2) follows an eccentric movement of the shaft (3) and takes on dynamic sealing of the rotating shaft (3), while another seal (4) compensates for an eccentric movement of the shaft (3) in relation to the housing by plastic or elastic deformation and therefore prevents a leakage between the housing part (12), which moves eccentrically, and a rigid housing (10). A defined quantity of liquid, which serves as a blocking agent and lubricant for the dynamic seal (2) of the shaft (3) towards the housing part (7), is metered in here, the liquid, apart from a residual excess, being drawn into the dynamic seal (2) by a pressure difference therewithin and thereby forming an effective block and seal.

A seal assembly for a valve stem comprises an external seal placed on a valve stem facing an external environment; an internal seal placed on the valve stem facing a process environment; the external and internal seals define a chamber for the containment of barrier fluid; the chamber has an inlet configured to be placed into fluid communication with a source of barrier fluid; a detector of the amount of barrier fluid; a pressurizer device for providing the chamber with a positive pressure with respect to the process environment; the pressurizer device is configured to be installed coaxially with the valve stem.

A sealing structure suppresses possible damage to a seal ring because of a backup ring. The sealing structure is characterized in that a cut portion 150 that is cut in a planar shape is formed in a backup ring 100 at one position in a circumferential direction, the cut portion 150 is configured such that a cut surface 153 is oblique to a central axis of the backup ring 100, an acute angle of angles between a surface on the high pressure side of the backup ring 100 and the cut surface 153 is set to not less than 15° and not more than 30°, and the backup ring 100 is formed of a resin material having Rockwell hardness of 100 or less, durometer hardness of 70 or less, and elastic modulus of 1.0 GPa or less.

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.