- Email: [email protected]
Fluted filter with axial seal
FEATURE the following companies: Freudenberg, for preparing the elastomer test sheets; Minz for cutting and despatching the S2 test-pieces; and Kaco, Minz, Parker and Trelleborg, for participating in the inter-laboratory test. Contact: Dr rer. nat. Jürgen Braun, Head of R&D Industrial Oils, Fuchs Europe Schmierstoffe GmbH, Friesenheimer Str. 19C, D-68169, Mannheim, Germany. Tel: +49 621 3701 1305, Fax: +49 621 3701 7939, Email: [email protected], www.fuchs-europe.de
Figure 10. Round robin (2009-2010): Influence on elasticity properties of 72 NBR 902.
2. DIN 53538. Standard reference elastomers, Parts 1, 3, 4, 6, 7, withdrawn 2006. 3. DIN ISO 1817. Rubber, vulcanized – Determination of the effect of liquids, June 2004 edition. 4. ISO 23529. Rubber – General procedures for preparing and conditioning test pieces for physical test methods, 1st edition, September 2004 5. ISO 13226. Rubber – Standard reference elastomers (SREs) for characterizing the effect of liquids on vulcanized rubbers, 2nd edition, November 2005. 6. ISO 6072. Hydraulic fluid power – Compatibility between fluids and standard elastomeric materials, 2nd edition, March 2002. 7. Nagdi, K., Die Verträglichkeit von Dichtungs-Werkstoffen mit Mineralölen (On the compatibility of gasket mate-
Patents Bellows-type mechanical seal Applicant: Eagle Industry Co Ltd, Japan The seal design detailed by this patent aims to provide a bellows assembly that has a high resistance to erosion. The entire surface of the bellows assembly is covered with an erosionresistant film formed by using physical vapour deposition (PVD), such as ion plating. Patent number: WO/2010/116844 Inventors: H. Takahashi Publication date: 14 October 2010
Seal structure Applicant: Uchiyama Manufacturing Corp, Japan 12
Sealing Technology
rials with mineral oils), Ölhydraulik und Pneumatik (Oil Hydraulics and Pneumatics) 12, 1972. 8. Wallner, U., Passen Dichtungswerkstoff und Hydrauliköl zusammen? (Is gasket material compatible with hydraulic oil?) Untersuchungen zur Elastomerverträglichkeit und Volumenänderung (Tests for elastomer compatibility and volume change), Ölhydraulik und Pneumatik (Oil Hydraulics and Pneumatics) 9, 2006.
Acknowledgements
This feature article is based on a paper entitled ‘Current Elastomer Compatibility Test Standards – a Critical Reflection’, which was presented at the 16th International Sealing Conference that was held in Germany at Stuttgart University on 12–13 October 2010. Contact: Fachverband Fluidtechnik im VDMA, Postfach 71 08 64, 60498 Frankfurt/Main, Germany. www.sealing-conference.com Originally written in German, the text was translated into English by the British Fluid Power Association (BFPA). Contact: BFPA, Cheriton House, Cromwell Park, Chipping Norton, Oxon OX7 5SR, UK. www.bfpa.co.uk
I would like to warmly thank all the participants in the inter-laboratory test, particularly
In this invention a seal (8) is applied to a rotating shaft (7) such that the seal can rotate relatively. An elastic buffer member (9) is bonded between the seal (8) and the cover (5). It would appear that the purpose of this approach is to provide flexibility to the seal mounting. A number of variants for the flexible mount are illustrated. No specific application is mentioned in the English abstract. Patent number: WO/2010/116877 Inventors: M. Okuda, T. Kakuta, K. Yoshijima, T. Yamazaki, Y. Yamada, H. Matsuoka, H. Kurita, S. Fujita and Y. Ohashi Publication date: 14 October 2010
Fluted filter with axial seal Applicant: Baldwin Filters Inc, USA An arrangement that may be used on air
A flexible shaft seal structure for mounting a shaft drive to an enclosure forms the subject of patent WO/2010/116877.
March 2011
PATENTS filter elements is described by this patent. The axial seal is supported by, and attached to, the filter media pack by a media pack seal member. Alternatively, the seal member may be carried by a frame, which is attached to the filter media pack by the media pack seal member. Numerous different systems are illustrated. A typical example uses a soft elastomer axial seal and a harder material for the media pack seal. Patent number: WO/2010/117606 Inventors: K. Swanson, C. Banzhaf and S.J. Merritt Publication date: 14 October 2010
Rotatable pipe fitting for a sprinkler head Applicant/Inventor: W. Spears, USA A pipe fitting (10) that is designed to be installed on a sprinkler head (12) is described. The fitting is sealed by screwing it down onto a seal (16) in a recess. The seal has an oval section, with the major diameter oriented longitudinally to the thread axis. This enables the head to be rotated within the downstream end of the body (14) through 360º while remaining liquid tight for pressures in excess of 20 bar (300 psig). Patent number: WO/2010/117988 Publication date: 14 October 2010
Rotary seal with truncated wave form Applicant: Kalsi Engineering Inc, USA A development of the well established Kalsi seal, which uses a wavy circumferential profile, is described. This invention relates to a feature that improves seal lubrication in adverse conditions, such as high operating temperatures, skew-resisting confinement, high differential pressure, high initial com-
A revised version of the Kalsi wave-seal – designed to improve lubrication under adverse conditions (patent WO/2010/118253).
pression, adverse tolerance accumulation, circumferential compression, high modulus seal materials, dynamic run-out, reversing differential pressure, thin viscosity lubricants, third-body seal surface wear, and/or material swell. In some cases, certain designs fall short when exposed to severe operating conditions. Smaller seal cross-sections are desirable because the shaft and housing wall thickness can be maximised. Miniaturisation affects seal lubrication. For a given dimensional compression, interfacial contact pressure increases as the seal cross-section is miniaturised. With radial seals, circumferential compression increases as the diameter is miniaturised, increasing footprint spread and contact pressure. The incorporation of a bidirectional ‘‘diverter’’ on the dynamic lip moves additional lubricant into critical areas of the
An oval-section seal enables the sprinkler head to be adjusted through 360º. Patent WO/2010/117988 has further details.
March 2011
sealing interface. This diverter is preferably implemented in a way that also helps to minimise seal volume for improved compatibility with skew-resisting confinement. The diverter geometry also preferably intersects both the traditional dynamic sealing surface and the traditional hydrodynamic inlet, and may also intersect the lubricant-side flank of the dynamic lip. The diverter can be incorporated by ‘‘faceting’’ or scalloping the wave to give it a truncated appearance. Elastomeric materials that may be combined with various plastic materials – such as those based on reinforced polytetrafluoroethylene (PTFE) plastics – may be used. Seals may have a monolithic integral, one-piece construction, or may also incorporate different materials bonded, inter-fitted and co-vulcanised. Patent number: WO/2010/118253 Inventor: J.E. Schroeder Publication date: 14 October 2010
Flange seal Applicant/Inventor: C. Oldnall, Australia This flange sealing assembly uses a pair of gaskets separated by a spacer. The spacer is an annular hydraulic cylinder that is used to load the gasket. A single-acting version is also illustrated for pipe end flanges. After flange loading the spacer may be mechanically locked in position by a locking ring to maintain the flange load. Alternatively, the hydraulic pressure is locked off in the spacer by a non-return valve to maintain the load. This device is said to be particularly useful for joints that have to be taken apart regularly as it is also effectively a spool piece. Illustrations show it being used with spiralwound gaskets and metal ring joints. Patent number: WO/2010/118464 Publication date: 21 October 2010 Technical Editor’s comment: This is good news for gasket suppliers, as they are able to sell two gaskets. The sealing of the hydraulic piston is
A hydraulic loading spool for gasket assemblies. Patent WO/2010/118464 has further details.
Sealing Technology
13
Figure 10. Round robin (2009-2010): Influence on elasticity properties of 72 NBR 902.
2. DIN 53538. Standard reference elastomers, Parts 1, 3, 4, 6, 7, withdrawn 2006. 3. DIN ISO 1817. Rubber, vulcanized – Determination of the effect of liquids, June 2004 edition. 4. ISO 23529. Rubber – General procedures for preparing and conditioning test pieces for physical test methods, 1st edition, September 2004 5. ISO 13226. Rubber – Standard reference elastomers (SREs) for characterizing the effect of liquids on vulcanized rubbers, 2nd edition, November 2005. 6. ISO 6072. Hydraulic fluid power – Compatibility between fluids and standard elastomeric materials, 2nd edition, March 2002. 7. Nagdi, K., Die Verträglichkeit von Dichtungs-Werkstoffen mit Mineralölen (On the compatibility of gasket mate-
Patents Bellows-type mechanical seal Applicant: Eagle Industry Co Ltd, Japan The seal design detailed by this patent aims to provide a bellows assembly that has a high resistance to erosion. The entire surface of the bellows assembly is covered with an erosionresistant film formed by using physical vapour deposition (PVD), such as ion plating. Patent number: WO/2010/116844 Inventors: H. Takahashi Publication date: 14 October 2010
Seal structure Applicant: Uchiyama Manufacturing Corp, Japan 12
Sealing Technology
rials with mineral oils), Ölhydraulik und Pneumatik (Oil Hydraulics and Pneumatics) 12, 1972. 8. Wallner, U., Passen Dichtungswerkstoff und Hydrauliköl zusammen? (Is gasket material compatible with hydraulic oil?) Untersuchungen zur Elastomerverträglichkeit und Volumenänderung (Tests for elastomer compatibility and volume change), Ölhydraulik und Pneumatik (Oil Hydraulics and Pneumatics) 9, 2006.
Acknowledgements
This feature article is based on a paper entitled ‘Current Elastomer Compatibility Test Standards – a Critical Reflection’, which was presented at the 16th International Sealing Conference that was held in Germany at Stuttgart University on 12–13 October 2010. Contact: Fachverband Fluidtechnik im VDMA, Postfach 71 08 64, 60498 Frankfurt/Main, Germany. www.sealing-conference.com Originally written in German, the text was translated into English by the British Fluid Power Association (BFPA). Contact: BFPA, Cheriton House, Cromwell Park, Chipping Norton, Oxon OX7 5SR, UK. www.bfpa.co.uk
I would like to warmly thank all the participants in the inter-laboratory test, particularly
In this invention a seal (8) is applied to a rotating shaft (7) such that the seal can rotate relatively. An elastic buffer member (9) is bonded between the seal (8) and the cover (5). It would appear that the purpose of this approach is to provide flexibility to the seal mounting. A number of variants for the flexible mount are illustrated. No specific application is mentioned in the English abstract. Patent number: WO/2010/116877 Inventors: M. Okuda, T. Kakuta, K. Yoshijima, T. Yamazaki, Y. Yamada, H. Matsuoka, H. Kurita, S. Fujita and Y. Ohashi Publication date: 14 October 2010
Fluted filter with axial seal Applicant: Baldwin Filters Inc, USA An arrangement that may be used on air
A flexible shaft seal structure for mounting a shaft drive to an enclosure forms the subject of patent WO/2010/116877.
March 2011
PATENTS filter elements is described by this patent. The axial seal is supported by, and attached to, the filter media pack by a media pack seal member. Alternatively, the seal member may be carried by a frame, which is attached to the filter media pack by the media pack seal member. Numerous different systems are illustrated. A typical example uses a soft elastomer axial seal and a harder material for the media pack seal. Patent number: WO/2010/117606 Inventors: K. Swanson, C. Banzhaf and S.J. Merritt Publication date: 14 October 2010
Rotatable pipe fitting for a sprinkler head Applicant/Inventor: W. Spears, USA A pipe fitting (10) that is designed to be installed on a sprinkler head (12) is described. The fitting is sealed by screwing it down onto a seal (16) in a recess. The seal has an oval section, with the major diameter oriented longitudinally to the thread axis. This enables the head to be rotated within the downstream end of the body (14) through 360º while remaining liquid tight for pressures in excess of 20 bar (300 psig). Patent number: WO/2010/117988 Publication date: 14 October 2010
Rotary seal with truncated wave form Applicant: Kalsi Engineering Inc, USA A development of the well established Kalsi seal, which uses a wavy circumferential profile, is described. This invention relates to a feature that improves seal lubrication in adverse conditions, such as high operating temperatures, skew-resisting confinement, high differential pressure, high initial com-
A revised version of the Kalsi wave-seal – designed to improve lubrication under adverse conditions (patent WO/2010/118253).
pression, adverse tolerance accumulation, circumferential compression, high modulus seal materials, dynamic run-out, reversing differential pressure, thin viscosity lubricants, third-body seal surface wear, and/or material swell. In some cases, certain designs fall short when exposed to severe operating conditions. Smaller seal cross-sections are desirable because the shaft and housing wall thickness can be maximised. Miniaturisation affects seal lubrication. For a given dimensional compression, interfacial contact pressure increases as the seal cross-section is miniaturised. With radial seals, circumferential compression increases as the diameter is miniaturised, increasing footprint spread and contact pressure. The incorporation of a bidirectional ‘‘diverter’’ on the dynamic lip moves additional lubricant into critical areas of the
An oval-section seal enables the sprinkler head to be adjusted through 360º. Patent WO/2010/117988 has further details.
March 2011
sealing interface. This diverter is preferably implemented in a way that also helps to minimise seal volume for improved compatibility with skew-resisting confinement. The diverter geometry also preferably intersects both the traditional dynamic sealing surface and the traditional hydrodynamic inlet, and may also intersect the lubricant-side flank of the dynamic lip. The diverter can be incorporated by ‘‘faceting’’ or scalloping the wave to give it a truncated appearance. Elastomeric materials that may be combined with various plastic materials – such as those based on reinforced polytetrafluoroethylene (PTFE) plastics – may be used. Seals may have a monolithic integral, one-piece construction, or may also incorporate different materials bonded, inter-fitted and co-vulcanised. Patent number: WO/2010/118253 Inventor: J.E. Schroeder Publication date: 14 October 2010
Flange seal Applicant/Inventor: C. Oldnall, Australia This flange sealing assembly uses a pair of gaskets separated by a spacer. The spacer is an annular hydraulic cylinder that is used to load the gasket. A single-acting version is also illustrated for pipe end flanges. After flange loading the spacer may be mechanically locked in position by a locking ring to maintain the flange load. Alternatively, the hydraulic pressure is locked off in the spacer by a non-return valve to maintain the load. This device is said to be particularly useful for joints that have to be taken apart regularly as it is also effectively a spool piece. Illustrations show it being used with spiralwound gaskets and metal ring joints. Patent number: WO/2010/118464 Publication date: 21 October 2010 Technical Editor’s comment: This is good news for gasket suppliers, as they are able to sell two gaskets. The sealing of the hydraulic piston is
A hydraulic loading spool for gasket assemblies. Patent WO/2010/118464 has further details.
Sealing Technology
13