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| Number | Title | Issue Date |
| 7950668 | Remote operated actuator system for drill string internal blowout preventer An air swivel ring includes a non-rotating member having an air inlet, a rotating member having an air outlet, and a split seal having a first sealing surface and coupled to one of the non-rotating member and the rotating member so that the first sealing surface on ... | 05/31/2011 |
| 7232601 | Method for preparing composite flexible graphite material An improved method enables preparation of articles for a variety of applications, including embossing or otherwise shaping to form a variety of articles. A plurality of thin, preferably resin-impregnated, flexible graphite sheets are arranged to form zones in a comp... | 06/19/2007 |
| 7186309 | Method for preparing composite flexible graphite material An improved method enables preparation of articles for a variety of applications, including embossing or otherwise shaping to form a variety of articles. A plurality of thin, preferably resin-impregnated, flexible graphite sheets are arranged to form zones in a comp... | 03/06/2007 |
| 6935632 | Automatically disengaging spacing mechanism for a mechanical seal A spacing mechanism is provided for locating at least one rotatable component relative to a stationary component of a mechanical seal. The spacing mechanism is configured to automatically disengage from the rotatable seal component, and/or its associated hardware, u... | 08/30/2005 |
| 6673201 | Top separator with intraseal for digester vessel in a pulp or fiber processing system A top separator assembly for a digester is disclosed comprising: a rotatable shaft for the top separator; a packing for the shaft; and a sealing ring operatively mounted to the shaft and having a nominal clearance with the pack box, said sealing ring moun... | 01/06/2004 |
| 6311726 | Water pressure control An apparatus to control the flow rate of water between two pressurized areas, particularly for metered delivery of water to the packing of a pump's stuffing box. The object of the invention is to increase the useful life of the shaft of a process pump or ... | 11/06/2001 |
| 6267380 | Choke arrangement and a method for operating said choke arrangement The choke arrangement comprises an elastic choke ring which consists of a single piece with a gap formed by a parting joint. The choke arrangement: further comprises a support ring which is arranged directly adjacent to the choke ring in the axial directi... | 07/31/2001 |
| 6168161 | Rotary valve shaft seal A shaft seal having spacers positioned between the packing follower and the body of a valve. The spacers are flat, hard members of a certain thickness which allow maximum tightening of the packing fasteners and determine the maximum pressure the packing f... | 01/02/2001 |
| 6105596 | Sealing system A sealing assembly with a first molded graphite ring of generally triangular cross section, one side of which is in use perpendicular to the longitudinal axis of a rotatable and/or slidable shaft, the surface of which is to be sealed in an axial direction... | 08/22/2000 |
| 5860478 | Sub-sea test tree apparatus Apparatus and a method for killing a live well after activation of a well blowout preventer is described. This is achieved by providing apparatus in the form of a shear or kill sleeve (34) in a string (26) above a sub-sea test tree and which is located be... | 01/19/1999 |
| 5845909 | Stuffing box with improved packing rings and method A stuffing box 10, 60 designed for sealing engagement with a rod member R includes a plurality of stacked packing rings 32, 110, 150, 210, and a gland member 42, 64 axially moveable relative to the stuffing box body 12, 62 for varying the compressive forc... | 12/08/1998 |
| 5727793 | Packing box for fluid displacement device A packing box (10) is provided for housing a packing seal (48) between a rotating shaft (32) and the casing (18) of a pump. The packing box (10) comprises walls defining an enclosed chamber for accommodating the packing. An annular plate (36) is provided ... | 03/17/1998 |
| 5716055 | Method of making packing material having expanded graphite dispersed throughout A minimum leakage packing system is provided for sealing pump shafts and the like. The packing is manufactured from twisted, exfoliated extruded, pultruded or slit graphite material that is braided, twisted, laid up or otherwise combined to form mechanica... | 02/10/1998 |
| 5577737 | Method and apparatus for establishing and maintaining a fluid seal around a polishing rod The invention is a sealing apparatus and method of providing a seal for polished rods in oil and gas well applications. The sealing apparatus has a fluid responsive gland which forms a seal between the inner surface of a unitized housing body and a polish... | 11/26/1996 |
| 5573253 | Packing rings, method for production of the packing rings, and seal device using the packing rings A packing ring of a composite structure including a packing of expanded graphite and an annular mass of superposed sheets of expanded graphite is produced by a method including the steps of spirally winding a ribbon of expanded graphite into a roll, compr... | 11/12/1996 |
| 5524902 | Method and cartridge seal for packaging a valve A packing system, for providing a seal around a valve stem, including a packing cartridge and a bushing. The packing cartridge includes a sleeve which has a tapered central passage. The sleeve also has external male threads and a hex head. Packing materia... | 06/11/1996 |
| 5356157 | Internal live loading packing gland Live loading is applied on each end of both the secondary and the primary packing of a packing gland. After installing the primary packing assembly and a lantern ring, the primary packing is compressed to proper specifications. While the primary gland is ... | 10/18/1994 |
| 5316319 | Liveload assembly for maintaining torque on bolts A liveload assembly having a stack guide with a thread on the exterior side wall, a plurality of compressible belleville washers stacked inside the stack guide, and a retainer cap having a thread on an inner side wall for matingly engaging with the stack ... | 05/31/1994 |
| 5292137 | Rotary shaft sealing method and device A dry-face sealing method for preventing leakage around a rotary shaft uses an annular rigid seal having a smooth sealing surface and an annular resilient seal having a projecting sealing edge aligned coaxially therewith. The annular resilient seal has a ... | 03/08/1994 |
| 5267736 | Sealing apparatus for rotating shafts, in particular stern tube seal for the propeller shaft of a ship A sealing apparatus for rotating shafts, in particular a stern tube seal for a propeller shaft of a ship with or without shaft bushings, with aligned gaskets resting on the shaft and located in a stationary support system, preferably of an axial face seal... | 12/07/1993 |
| 4597581 | Pressure seal for valve stems and the like An improved elastomeric seal for preventing both low or high pressure fluid from escaping past a rotatable valve stem or similar shaft. The annular seal comprises an outer generally envelope-shaped first plastic member for sealing engagement with the rota... | 07/01/1986 |
| 4515512 | Seal for high pressure pump or the like A seal for the drive shaft of a gear pump for melted polymeric materials is provided, which includes a reduced pressure zone, a mechanical packing seal, and a liquid filled chamber positioned in succession along the drive shaft. The liquid is a solvent fo... | 05/07/1985 |
| 4512586 | Seal with preformed V-shaped packing rings and method A packing arrangement for sealing an area about a shaft in a structural body includes a plurality of V-shaped packing rings in stacked alignment. The packing rings are made from a memory retainable material and preformed into the V-shaped configuration wi... | 04/23/1985 |
| 4328974 | Stuffing box packing system and method A packing (10) for a stuffing box (12), for example, for petrochemical and/or power industry valves including one or more low density, graphite preform rings (30 and 44) which are further compressed, when the packing gland is tightened, with controlled ma... | 05/11/1982 |
| 4289317 | Pump shaft closure An improved stuffing box can effect an auxilliary static seal with a moveable shaft to allow replacement of packing elements. The stuffing box includes a sealing ring concentrically disposed around the shaft and means for mounting the sealing ring radiall... | 09/15/1981 |
| 4270762 | Disperser seal and method A seal for a shaft of a disperser crusher, that pulverizes hot coal particles, maintains a higher than atmospheric pressure within a casing for the crusher, and is able to withstand elevated temperatures that are produced within the casing. The pressure a... | 06/02/1981 |
| 4068853 | Stuffing box seal A highly efficient packing material is provided in the form of a flexible, corrugated expanded graphite ribbon or tape, which material can be used to pack the stuffing box assembly of any pump or valve, or like structure, regardless of the dimensions of t... | 01/17/1978 |
