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Shutdown seal for reactor coolant pump
PATENTS Propshaft boot with integrated bearing seal deflector Applicant: American Axle & Manufacturing Inc, USA A boot for use on a sliding splined propshaft is described. To provide additional protection
to the adjacent bearing seal and prevent ballooning of the boot a radial insert is moulded into the end of the boot. This provides a radial deflector close to the shaft seal. Patent number: WO 2007/047050 Inventors: D.F. Patrascu and R.J. Wehner Publication date: 26 April 2007
Foamed fluoroelastic gasket material Applicant: Wolverine Advanced Materials LLC, USA Foamed rubber metal composites are used as gaskets in automotive and fluid applications where they may also be a noise, vibration or heat insulator. This invention is aimed at providing a gasket capable of higher temperatures that the conventional NBR foamed gaskets. It uses a foamed FKM rubber formulation based on a terpolymer of tetrafluoroethylene, propylene and vinylidene fluoride. It is foamed using thermoplastic beads incorporating a blowing agent such as 80-2-isopentene. These provide for very precise control of the foaming reaction and also ensure that the foaming reaction occurs at a temperature below the cure temperature for the FKM polymer and occurs during the cure process. Patent number: WO 2007/047236 Inventors: H. Li, A.A. Sheikh and A. Wesley Publication date: 26 April 2007
Sealing joint A boot for a splined shaft joint that includes a radial deflector adjacent to the bearing seal, from WO 2007/047050.
Shutdown seal for reactor coolant pump Applicant: Stein Seal Co, USA The invention seeks to provide a shutdown seal that will operate for a minimum of twenty-four hours while maintaining a leakage rate of approximately 0.5 gal/min or less of reactor coolant water. It is designed to have no impact on the main seals currently fitted to the pump. The seal includes a two-piece interlocked housing which encompasses carbon graphite ring segments, a garter spring and a series of compression springs. The replaceable insert contains the shutdown seal assembly and is biased axially with a wave spring. The seal is designed with coolant fluid flow directly in contact with the ring segments and specially designed paths around the ring segments during normal pump operation. The seal is actuated by means of a thermally sensitive piston that moves the housing axially into a blocking position within the coolant flow path to minimize fluid flow through and around the seal. Patent number: WO 2007/047104 Inventors: M.E. Sanville et al. Publication date: 26 April 2007
September 2007
Applicant: Granor Rubber & Engineering Pty Ltd, Australia This patent describes an improved extruded profile for use as a seal and expansion joint between concrete sections in buildings or roads. Standard rectangular sections are prone to extrude when the sections are pressed together. To overcome this problem the side sealing faces have been profiled into a pointed tooth-like jagged contour. Additionally, the gap walls are also prepared for application of adhesive by grit blasting and chemically cleaning before glue is applied. If carried out correctly the adhesive forms a strong, water tight bond between the expansion joint and the surface. A number of variants for the seal profile are illustrated. Patent number: WO/2007/048188 Inventor: G.N. Ellis. Publication date: 3 May 2007
Boot for universal joint
The carbon circumferential seal described in WO 2007/047104 is designed as a shutdown seal for reactor coolant pumps. The piston (16) is actuated by increasing temperature of the water around the seal and energizes the seal into position.
Applicant: NOK Corporation, Japan A boot for a universal joint that is capable of preventing the top parts of the bellows from being inverted when a rotating shaft is angularly displaced. The displacement can also occur without increasing the outer diameter of the bellows. Patent number: WO 2007/043372 Inventor: H. Satoh Publication date: 19 April 2007
Sealing Technology
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to the adjacent bearing seal and prevent ballooning of the boot a radial insert is moulded into the end of the boot. This provides a radial deflector close to the shaft seal. Patent number: WO 2007/047050 Inventors: D.F. Patrascu and R.J. Wehner Publication date: 26 April 2007
Foamed fluoroelastic gasket material Applicant: Wolverine Advanced Materials LLC, USA Foamed rubber metal composites are used as gaskets in automotive and fluid applications where they may also be a noise, vibration or heat insulator. This invention is aimed at providing a gasket capable of higher temperatures that the conventional NBR foamed gaskets. It uses a foamed FKM rubber formulation based on a terpolymer of tetrafluoroethylene, propylene and vinylidene fluoride. It is foamed using thermoplastic beads incorporating a blowing agent such as 80-2-isopentene. These provide for very precise control of the foaming reaction and also ensure that the foaming reaction occurs at a temperature below the cure temperature for the FKM polymer and occurs during the cure process. Patent number: WO 2007/047236 Inventors: H. Li, A.A. Sheikh and A. Wesley Publication date: 26 April 2007
Sealing joint A boot for a splined shaft joint that includes a radial deflector adjacent to the bearing seal, from WO 2007/047050.
Shutdown seal for reactor coolant pump Applicant: Stein Seal Co, USA The invention seeks to provide a shutdown seal that will operate for a minimum of twenty-four hours while maintaining a leakage rate of approximately 0.5 gal/min or less of reactor coolant water. It is designed to have no impact on the main seals currently fitted to the pump. The seal includes a two-piece interlocked housing which encompasses carbon graphite ring segments, a garter spring and a series of compression springs. The replaceable insert contains the shutdown seal assembly and is biased axially with a wave spring. The seal is designed with coolant fluid flow directly in contact with the ring segments and specially designed paths around the ring segments during normal pump operation. The seal is actuated by means of a thermally sensitive piston that moves the housing axially into a blocking position within the coolant flow path to minimize fluid flow through and around the seal. Patent number: WO 2007/047104 Inventors: M.E. Sanville et al. Publication date: 26 April 2007
September 2007
Applicant: Granor Rubber & Engineering Pty Ltd, Australia This patent describes an improved extruded profile for use as a seal and expansion joint between concrete sections in buildings or roads. Standard rectangular sections are prone to extrude when the sections are pressed together. To overcome this problem the side sealing faces have been profiled into a pointed tooth-like jagged contour. Additionally, the gap walls are also prepared for application of adhesive by grit blasting and chemically cleaning before glue is applied. If carried out correctly the adhesive forms a strong, water tight bond between the expansion joint and the surface. A number of variants for the seal profile are illustrated. Patent number: WO/2007/048188 Inventor: G.N. Ellis. Publication date: 3 May 2007
Boot for universal joint
The carbon circumferential seal described in WO 2007/047104 is designed as a shutdown seal for reactor coolant pumps. The piston (16) is actuated by increasing temperature of the water around the seal and energizes the seal into position.
Applicant: NOK Corporation, Japan A boot for a universal joint that is capable of preventing the top parts of the bellows from being inverted when a rotating shaft is angularly displaced. The displacement can also occur without increasing the outer diameter of the bellows. Patent number: WO 2007/043372 Inventor: H. Satoh Publication date: 19 April 2007
Sealing Technology
13