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 martinsteic 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.

An annular seal comprising a first energized jacket defining a first axial end of the annular seal; a plurality of seal rings defining a second axial end of the annular seal; a second energized jacket disposed between the first energized jacket and the plurality of seal rings; and a spacer disposed between the first and second energized jackets.

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.

An apparatus to identify proper loading for valve packing includes a packing follower for a fluid control valve. The packing follower has a cavity to receive a spring and at least a portion of a packing spacer. The apparatus also includes a first aperture disposed on an outer surface of the packing follower extending to the cavity to expose a portion of the spring.

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.

Seal assemblies for use with fluid valves are disclosed. An apparatus includes a valve plug having a first annular shoulder adjacent an end of the valve plug, a seal disposed on the first annular shoulder, and a fastener at the end of the valve plug to force the seal against the first annular shoulder to apply a load to the seal.

An apparatus to identify proper loading for valve packing includes a packing follower for a fluid control valve. The packing follower has a cavity to receive a spring and at least a portion of a packing spacer. The apparatus also includes a first aperture disposed on an outer surface of the packing follower extending to the cavity to expose a portion of the spring.

A regulating valve has a gland portion slidably holding a valve stem and the gland portion includes a lid member having a first through-hole into which the valve stem is inserted, gland packings disposed on a spacer provided between the inner wall of the first through-hole and the valve stem, a packing follower in which a first cylindrical portion is connected concentrically to a second cylindrical portion having an outer diameter smaller than the first cylindrical portion, disc springs laminated with each other on the first cylindrical portion to surround the second cylindrical portion of the packing follower, and a packing flange having a second through-hole into which the second cylindrical portion of the packing follower is inserted, the packing flange being disposed on the disc springs, the packing flange being fixed to the packing follower by fitting the second cylindrical portion to the second through-hole.

Seal assemblies for use with fluid valves are disclosed. An apparatus includes a valve plug having a first annular shoulder adjacent an end of the valve plug, a seal disposed on the first annular shoulder, and a fastener at the end of the valve plug to force the seal against the first annular shoulder to apply a load to the seal.

A control valve unit includes a valve rod sealed from a valve housing via a seal assembly. The seal assembly has a packing, received axially between a pressure sleeve and a counter bearing on the valve housing. The pressure sleeve is movably and axially mounted via a pressing element relative to the valve housing and transmits a pressing force to the pressure sleeve by a spring element to the packing. The spring element is supported on a pretensioning device with an adjustable distance to the counter bearing. The pressing force of the spring element on the pressure sleeve is adjustable and the spring element is arranged axially between first and second stops of the pretensioning device. In a preinstalled state of the pretensioning device, the spring element is supported on the first and second stops. In an operating state, the second stop is at a fixed distance to the first stop in the direction of the counter bearing. The change in the axial position of the pressure sleeve is limited by the second stop and at a distance to the pressure element in the direction of the counter bearing.