A pressure-tight stem cylinder seal and a self-energizing stem shoulder seal matching the stem cylinder seal that both use an equilaterally triangular soft ring as their sealing element, wherein their designing rules are first, by means of wedging function of a hard gland coaxial with the stem cylinder, to convert their original axial tightening force 2f respectively into a radial compression force 4f/√3 of their soft ring 04 on the stem 02 cylinder and another radial compression force 2f of their soft ring 06 on the stem 02 shoulder and ensure that the two soft rings are so compressed from a great room to a small room as to be able to pass a pressure or stress exactly to each different direction, then to cut off their off-stem corners to give their cavities an opening or give each soft ring an axial compressing allowance, and last, by means of anti-extrusion metallic C-rings without axial resistance, to close each opening to provide a full support for the sealing deformation of their soft rings compressed in their cavities.

One or more packing systems and/or methods of manufacture are disclosed for a valve seal with lowered emissions while being complaint with fire standards. The packing system may have alternating mid-layers, a top layer, a bottom layer, and a first end cap and a second end cap. The layers can be formed of a flexible graphite-based material and/or a perfluoroalkoxy alkane (PFA) material. The layers may be bonded together and expand under compression to form a seal between a valve stem and a stuffing box.

Disclosed is a hermetically sealed assembly for precompression of a martinsetic metal for use in negative pressure energy transfer systems, and method of making same. The assembly comprising a martinsetic metal disposed between and in contact with sapphire windows. The assembly has an internal channel to accommodate expansion and contraction of the martinsetic metal. Hermetic sealing means including in different embodiments positive pressure fasteners and a bellows element are used at the periphery of the assembly to enable operation over temperature ranges from ambient to cryogenic without loss of integrity or leakage.

Methods and apparatus to load a valve packing are described. An example load apparatus to load a valve packing includes a guide including a flange and a wall protruding from the flange. The wall defines a cavity to receive a biasing element and a stop movable between a non-active state and an active state. The stop in the non-active state to enable movement of the guide in a first rectilinear direction relative to a longitudinal axis of a packing bore of a fluid valve and the stop in the active state to prevent movement of the guide in the first rectilinear direction. The stop to control an amount of deflection of the biasing element in the first rectilinear direction when the stop is in the active state.

A pressure-tight stein cylinder seal and a self-energizing stein shoulder seal matching the stein cylinder seal that both use an equilaterally triangular soft ring as their sealing element, wherein their designing rules are first, by means of wedging function of a hard gland coaxial with the stein cylinder, to convert their original axial tightening force 2f respectively into a radial compression force 4f/√3 of their soft ring 04 on the stein 02 cylinder and another radial compression force 2f of their soft ring 06 on the stein 02 shoulder and ensure that the two soft rings are so compressed from a great room to a small room as to be able to pass a pressure or stress exactly to each different direction, then to cut off their off-stein corners to give their cavities an opening or give each soft ring an axial compressing allowance, and last, by means of anti-extrusion metallic C-rings without axial resistance, to close each opening to provide a full support for the sealing deformation of their soft rings compressed in their cavities.

Methods and apparatus to load a valve packing are described. An example load apparatus to load a valve packing includes a guide including a flange and a wall protruding from the flange. The wall defines a cavity to receive a biasing element and a stop movable between a non-active state and an active state. The stop in the non-active state to enable movement of the guide in a first rectilinear direction relative to a longitudinal axis of a packing bore of a fluid valve and the stop in the active state to prevent movement of the guide in the first rectilinear direction. The stop to control an amount of deflection of the biasing element in the first rectilinear direction when the stop is in the active state.

A packing system for a pump includes a packing stack comprising a packing, wherein the packing is cylindrical and compressible such that the packing can fill a void volume in a reciprocating element bore of the pump; one or more springs; and a terminal component configured for sealing a terminus of the reciprocating element bore, wherein the one or more springs are positioned between the terminal component and the packing to provide a force on the packing that maintains compression of the packing within the void volume.

A clamshell half of a split ring mechanical seal face assembly comprises a split seal ring half having circumferential and proximal surfaces that are seated against corresponding radial and axial support surfaces of a holder half. At least one extending member extends from a hole in the proximal surface to an arcuate slot in the axial support surface, or vice-versa, and thereby radially constrains the split seal ring half to remain unitized with the holder half during clamshell assembly, while permitting rotation of the split seal ring half about a shaft axis over a limited range, which in embodiments is between 2 degrees and 20 degrees. Embodiments further include a secondary seal between the holder half and split seal ring half that frictionally resists displacement of the split seal ring half.

The disclosure concerns a seal, in particular a rod seal for sealing an axially movable rod in a guide cylinder, in particular a piston seal for a pneumatically, electrically or hydraulically driven coating agent pump for pumping coating agent, having an annular sealing element for sealingly resting on a circumferential surface of an axially movable rod, and having at least one elastic annular pretensioning element, the annular pretensioning element surrounding the annular sealing element radially on the outside and pretensioning it radially to the inside. The disclosure provides an annular seal base body which externally surrounds and holds the sealing element and the pretensioning element. In addition, the disclosure also comprises an inverted variant in which the seal is arranged in an annular groove in a lateral surface of a piston and lies sealingly against the cylinder running surface.

A main object of the present invention is to disclose a piston rod sealing unit that solves the problems that have been mentioned from the prior art disclosures. The invention is a piston rod sealing system (0) with a sealing unit (9), for preventing leakage, of gas from a high-pressure chamber (4) to a low-pressure volume (6), and preventing leakage of a lubricant from said low-pressure volume (6) to said high-pressure chamber (4), along a piston rod (1) extending through said chambers (4, 6) said sealing unit (9) comprising, a deformable gland (10,21,26) arranged for being pressed against said piston rod (1) by one or more compressing elements (15, 22, 27), a lubricant (F) between the piston rod (1) and the gland (10, 21, 26), said sealing unit (9) arranged between, a support structure (8) in the low-pressure volume (6) with a plane sliding surface (8a) facing towards said sealing unit (9), and a wall (7) of said high-pressure chamber (4), a plane seal (16) constituting a seal between the sealing unit (9) and said wall (7), said plane seal (16) arranged in a groove (13b, 24a, 26e) in said sealing unit (9), said groove open towards said wall (7), or said plane seal (16) arranged in a groove in the wall (7), said groove open towards said sealing unit (9) wherein, said sealing unit (9) having a surface area towards said wall (7) between said piston rod (1) and said plane seal (16) smaller than the sliding area between said sealing unit (9, 12b, 25a, 28a) and the plane sliding surface (8a), and said sealing unit (9) being supported by said plane sliding surface (8a) on the low-pressure side, and said sealing unit (9) being in sliding contact with said wall (7) surface (7a), the length (L) of said sealing unit (9) is less than the length (L) between the base structure (8) and the wall (7) allowing transverse movement of the sealing unit (9) along the sliding surfaces (7a, 8a).