A valve packing having independently loaded packing rings is disclosed. A packing assembly for a fluid valve includes a first packing ring, a first follower to be disposed at least partially within a bore of a bonnet of the fluid valve to apply a first load to the first packing ring, a second packing ring sized to fit within a bore of the first follower, and a second follower to be disposed at least partially within the bore of the first follower to apply a second load to the second packing ring within the bore of the first follower.

[Problem] To provide a sealing device having high pressure-resistance and durability for a reciprocating shaft. [Solution] A sealing device comprising an oil seal member and a dust seal member. The oil seal member and the dust seal member each comprise a rigid ring provided inside a shaft hole and an elastic ring attached to the rigid ring, wherein the elastic ring has formed thereon a lip for slidably contacting a reciprocating shaft. The sealing device further comprises an intermediate rigid ring provided between the elastic ring of the oil seal member and the elastic ring of the dust seal member, in a direction parallel to the axial direction of the reciprocating shaft.

[Problem] To provide a sealing device having high pressure-resistance and durability for a reciprocating shaft. [Solution] A sealing device comprising an oil seal member and a dust seal member. The oil seal member and the dust seal member each comprise a rigid ring provided inside a shaft hole and an elastic ring attached to the rigid ring, wherein the elastic ring has formed thereon a lip for slidably contacting a reciprocating shaft. The sealing device further comprises an intermediate rigid ring provided between the elastic ring of the oil seal member and the elastic ring of the dust seal member, in a direction parallel to the axial direction of the reciprocating shaft.

A sealing device is disposed within a circumferential groove of an inner member that reciprocates relative to an outer member. An inner seal ring of the sealing device is made of a resin and includes an outer peripheral surface having a circumferential groove. An outer seal ring of the sealing device has a high elasticity and is fitted into the circumferential groove of the inner seal ring. The outer seal ring is brought into slidable contact with the inner peripheral surface of the hole of the outer member. A back ring of the sealing device has a high elasticity, is disposed radially inside the inner seal ring, and is compressed between the inner peripheral surface of the inner seal ring and the bottom wall surface of the circumferential groove of the inner member. Inclined surfaces are formed at both ends of the outer peripheral surface of the inner seal ring in the axial direction of the inner seal ring, each of the inclined surfaces having a diameter that decreases as a distance from a center of the outer peripheral surface of the inner seal ring in the axial direction increases. Protruding annular portions are formed at both ends of the inner peripheral surface of the inner seal ring in the axial direction, the protruding annular portions protruding radially inward to restrict movement of the back ring in the axial direction.

The present disclosure relates to packing material for stuffing boxes. The packing material comprises a resilient body configured to generate a sealing force on shafts and characterized by a directional resiliency to maintain a substantially constant sealing force under conditions of wear and axial displacement of rotating shafts.

An improved bearing or bushing body extraction from a stuffing box using jack screws is provided. The bearing or bushing seal body includes at least one jack screw on each half of a split body. The jack screw passes axially through the sidewall of the body to the inner flange of the stuffing box and turning the jack screw against the inner flange to lift the body from the stuffing box. A single inner threaded or double threaded insert with a reverse outer thread and standard inner thread is inserted into the bottom wall of the body so that the body may be installed flush against the inner flange. By turning the jack screw through the insert and against the flange, the seal body is pushed out rather than pulled.

A piston assembly for a piston pump includes an actuator rod, a piston coupled to the actuator rod and configured to contact a radially-inner wall of a cylinder, and a piston support structure coupled to the actuator rod and configured to contact the radially-inner wall of the cylinder. A fluid channel extends through the actuator rod and the piston support structure, and the fluid channel is configured to deliver a lubricating fluid to an annular space positioned between the piston and the piston support structure along an axial axis of the piston assembly.

A radial pressure adjustable gland sealing system is disclosed herein. The system includes at least one inflatable bladder operable to surround a rotating shaft or sleeve of a rotating shaft, and at least one inflating tube. One end of each inflating tube is in fluid communication with the internal envelope of one of the at least one inflatable annular bladder. An opposite end of each inflating tube is connected, or extends, to a location outside of a static housing in which the rotating shaft is housed, such that the level of inflation of each inflatable bladder can be adjusted by way of its respective inflating tube, and thereby adjust the level of radial pressure exerted on the rotating shaft or sleeve for a rotating shaft.

A circular annular seal ring made of a resin is disposed between an inner member and an outer member that rotate relative to each other. The outer member includes a liquid-storing space and an inner surface having a circular cross section. The inner member is disposed in the liquid-storing space and includes a circumferential groove. The seal ring is stationary relative to the outer member and is slidably disposed in the circumferential groove of the inner member. Grooves are formed on an end surface on an external space side of the seal ring. Each groove has an end portion that opens at an inner peripheral surface of the seal ring, and extends in a direction opposite to a main rotational direction of the inner member relative to the seal ring from the open end portion, but does not extend in the main rotational direction from the open end portion.

The present disclosure relates to packing material for stuffing boxes. The packing material comprises a resilient body configured to generate a sealing force on shafts and characterized by a directional resiliency to maintain a substantially constant sealing force under conditions of wear and axial displacement of rotating shafts.