PATENTS

and the other plate (2) so as to straddle both of them. The gasket has an affixed section (31) which fills a groove (4) formed between the two plates.Patent number: WO/2013/031466Inventors: T. Shimazoe and S. WatanabePublication date: 7 March 2013

Hydraulic seal assembly for a thermoplastic material dispensing valveApplicant: Illinois Tool Works Inc, USAA seal assembly, for use within a hot-melt adhesive or other thermoplastic material dis-pensing valve assembly forms the subject of this patent. It consists of a sealing cartridge comprising primary and secondary seals, and a viscous incompressible silicone grease dis-posed internally within the sealing cartridge. The grease distributes the pressure forces such that internal pressure forces are substantially equal to external pressure forces of the hot-melt adhesive, whereby a pressure differential across the primary seal member is effectively removed, which effectively eliminates the tendency for leakage of the adhesive or other thermoplastic materials.Patent number: WO/2013/033053Inventor: G. McGuffeyPublication date: 7 March 2013

Seal for a rotary machine

Applicant: Nuovo Pignone Spa, ItalyEmbodiments of this invention generally relate to a rotary machine or turbo-machinery, but in particular they cover heat management in

compressors that use dry gas seals. According to an exemplary embodiment, a rotary machine includes a machine rotor and stator. A labyrinth seal and a dry gas seal are disposed between these components. In addition, the labyrinth seal includes a labyrinth-seal rotor and labyrinth-seal stator – the latter has a cavity containing a medium that is capable of transferring heat between the fluid seal stator and a zone adjacent to the fluid seal stator in order to cool or heat a pressurised process fluid before it bears against the dry gas seal. The accompanying figure shows the compres-sor (14) which includes both the labyrinth seal (20) and dry gas seal (30). As shown, the labyrinth seal and dry gas seal are disposed between the machine rotor (16) and stator (18) to prevent process fluid from leaking from the compressor. The dry gas seal (30) is disposed around the machine rotor at a posi-tion downstream of the labyrinth seal (20), relative to the pressurised process fluid. As a result of this configuration, only the process

fluids, which pass through the labyrinth seal (20) bear against the dry gas seal (30).Patent number: WO/2013/034655Inventors: M. Berti, S. Bresciani,

Publication date: 14 March 2013

Shaft-sealing device

Applicant: Eagle Industry Co Ltd, JapanThe purpose of this invention is to create a shaft-sealing device that does not leak at rest, operates with fluid lubrication during rotation, including the initial period of rotation, while preventing leakage, and is able to establish sealing and lubrication simultaneously. As a means of fulfilling these requirements, the design described is based on multiple pumping sections that are formed on the outer circum-ferential surface of a rotating member, and are separated from each other in the circumferen-tial direction. These sections generate a pump-ing effect because of the relative rotational sliding of the lip seal and the rotating member. The multiple pumping sections are provided with in-drawing pumping areas that act in a direction that draws in the fluid which is being sealed, and discharging pumping sections that act in a direction that expels the fluid which is being sealed. The design is also characterised by the lip of the seal running towards the air side, leaving a portion of the pumping sections, in the axial direction, on the side of the fluid that is being sealed.Patent number: WO/2013/035501Inventor: K. ShigenobuPublication date: 14 March 2013

Tool for removing sealant from a protruding fastener

Applicant: The Boeing Co, USAThis patent describes a tool and method for removing sealant from a protruding fastener. The tool comprises a shank for making a connection with a rotary drive, and a body disposed on the shank. The body includes a cavity with a working edge for engaging the sealant when the cavity is applied to the fastener. The method used to remove sealant involves aligning the tool with the protruding fastener, and progressively ‘‘urging’’ the tool in the aligned direction towards the fastener, while rotating it such that the periphery of the sealant-encapsulated fastener is encircled by the working edge.Patent number: WO/2013/036235Inventors: and M. D. FullerPublication date: 14 March 2013

14Sealing Technology July 2013

A cross-sectional view of a rotary machine, according to an exemplary embodiment of patent WO/2013/034655, showing the laby-rinth seal (20) and dry gas seal (30).

Patent WO/2013/031466 describes a gasket (3) that can be applied to laminated plates (1 & 2).