Mechanical Seals Manufacturer In China » mechanical-seals http://www.hfanlx.cn Professional Mechanical Seals,Rubber Mechanical Seals、Carbone Sealts In China Wed, 08 Sep 2010 12:10:25 +0000 http://wordpress.org/?v=2.8.2 en hourly 1 A new range of non-contacting mechanical seals http://www.hfanlx.cn/archives/30 http://www.hfanlx.cn/archives/30#comments Tue, 15 Sep 2009 14:03:51 +0000 admin http://www.hfanlx.cn/?p=30 Designed for non-turbo, large – bore rotating equipment applications, the new Type 2800X dual seals feature patented new technology that provide environmentally-friendly and emission-free sealing. The 2800X seals have been created for use in a wide variety of performance-critical applications. These include the processing of extremely pure materials where no contamination is permissible, the use of reactive or temperature-sensitive media where local process ‘hot spots’ can cause unwanted chemical reactions, cold applications such as ammonia processing, and air/oxygen-sensitive processes where unwanted oxidation reactions could occur. The seals feature spiral grooves machined into the mating ring faces of the seal heads. As the pump shaft rotates a pressurised inert gas is injected between the faces and compressed as it flows into these grooves. The gas expands again as it leaves the spiral grooves and generates a force which separates the faces to create non-contact operation. This minimises seal face wear, reduces running and repair costs and extends seal life. Because the gap between the seal faces is kept to a minimum, barrier gas usage is also reduced. A reverse pressure capability ensures that if the barrier gas fails the process pressure will close the seal faces, preventing any large-scale loss of process fluid to atmosphere. The result is safer and more environmentally-friendly operation, even under breakdown conditions. The system also eliminates the need for any complex barrier fluid system, which simplifies the installation procedure. This environmentally friendly performance of the 2800X seals also translates into greater economy for the end user. Figures released by the Fluid Sealing Association show that these seals reduce the cost of electricity used and the associated greenhouse gas emissions by 92% when compared to a conventional wet seal rotating at normal pump speeds and pressures. The patented 2800X design can accommodate both lower and higher speeds and pressures than similar seals and this further extends reliability, while the use of new polymeric components reduces hang-up problems with solid-in-liquid process fluids. The various 2800X seals also incorporate many common components. This minimises spares stockholding and also encourages the re-use, refurbishment and re-cycling characteristics of the seals. The ability to retrofit the 2800X range into installations currently using John Crane 2800, 2800ER, and 2800HP seals enables end-users to upgrade their current sealing arrangements as part of their normal maintenance programmes. Included in the 2800X range are versions that meet and exceed the performance and design requirements of the latest American Petroleum Institute API 682 edition seal standard. For more details please contact John Crane.

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]]> http://www.hfanlx.cn/archives/30/feed 0 Rotating Face Mechanical Seals http://www.hfanlx.cn/archives/28 http://www.hfanlx.cn/archives/28#comments Tue, 25 Aug 2009 03:21:06 +0000 admin http://www.hfanlx.cn/?p=28 Engineered for every shaft-sealing application in maintenance.. new production or conversion from braided pump packing. American Seal and Packing delivers a full range of rotary mechanical seals configurations and component materials – to handle virtually and fluid moved by any equipment. When you Specify a ASP seal you can the advantage of the most advanced mechanical seal technology, the latest in filed proven design and when working with our outside sales force hands on technical support. Rotating face units are the dependable mechanical seal answer for worn equipment when your shaft seals must be replaced. They are ideal for new equipment designs or to improve the usefulness of existing equipment by converting from pump packing.

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]]> http://www.hfanlx.cn/archives/28/feed 0 Mechanical Seals Introduction http://www.hfanlx.cn/archives/25 http://www.hfanlx.cn/archives/25#comments Sat, 01 Aug 2009 15:08:34 +0000 admin http://www.hfanlx.cn/?p=25 Mechanical seals are being used increasingly on fluid pumps to replace packed glands and lip seals.   Pumps with mechanical seals perform more efficiently and generally perform more reliably for extended periods of time.

Mechanical seals are provided to prevent pumped fluids from leaking out along the drive shafts.   The controlled leakage path is between two flat surfaces associated with the rotating shaft and the housing respectively.   The leakage path gap varies as the faces are subject to varying external loads which tend the move the faces relative to each other.

The mechanical seal requires a different shaft housing design arrangement compared to that for the other type of seals because the seal is a more complicated arrangement and the mechanical seal does not provide any support to the shaft.

In order for the mechanical seal to perform over an extended time period with low frictional the faces are generally hydrodynamically lubricated.   The fluid film will need to carry substantial load.   If the load becomes to high for the film surface contact will take place with consequent bearing failure. This lubricating film is generally of the order of 3 micrometres thick , or less. This thickness is critical to the required sealing function.   Mechanical seals often have one face of a suitable solid lubricant such that the seal can still operate for a period without the fluid film.

Pressure Balance Mechanical Seals

It is possible to reduce the seal contact pressure by using a pressure balanced seal design of off-set a proportion of the force generated by the pumped fluid pressure.   This principle is illustrated in the sketch below

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]]> http://www.hfanlx.cn/archives/25/feed 0 Mechanical seals http://www.hfanlx.cn/archives/11 http://www.hfanlx.cn/archives/11#comments Tue, 24 Mar 2009 04:09:55 +0000 admin http://www.hfanlx.cn/?p=11 mechanical seal Include: mechanical seal components, shaft seals, sealing rigid, light sealed, medium sealed, heavy-duty sealed, ceramic seal, graphite seal, silicon carbide seals and other products, products with the specifications of models, varieties Qi finished, durable, non-drop leakage and other characteristics. Materials used silicon carbide (SIC), Tungsten Carbide (WC), graphite (M), high purity alumina (AL2O3.99%), metals, ceramics and other materials. Widely used in dairy, food, beverages, beer, pharmaceutical, metallurgical, chemical, daily-use chemicals, fine chemicals, such as supporting the use of mechanical equipment, the technology reached the international leading level, and undertook a variety of non-standard seals Development and production

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