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Mechanical seals are used when a braided packing seal is not able to meet the design specification requirements. The design requirements may mandate a mechanical seal on cost or performance grounds, and even both. Mechanical seals are more expensive than braided packing seals, however they [url=http://www.mquin.com/giuseppezanotti.php]giuseppe zanotti sneakers[/url] have the ability to be more economical because they are more [url=http://www.davidhabchy.com]barbour sale[/url] efficient in [url=http://www.mansmanifesto.fr]doudoune moncler homme[/url] terms of reducing leakage or delivering higher performance compared to [url=http://www.rtnagel.com/airjordan.php]jordan pas cher[/url] packing seals. Designers must finely balance the use of either seal against the need for [url=http://61.132.1.66/dgnews/guestbook.asp]hollister[/url] environmental, performance and cost factors of the overall pumping systems operational performance.

Mechanical seals are capable of operating in high [url=http://www.1855sacramento.com/moncler.php]moncler outlet[/url] temperature conditions, up to 1,800 F and pressurized environments between near complete vacuum and up to 5,000psi; in addition, shaft speeds up to 50,000 revolutions per minute (RPM) [url=http://www.rtnagel.com/airjordan.php]nike air jordan pas cher[/url] and where the seal must deal with corrosive chemical properties, or where contamination of the fluid being handled is a factor.

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Mechanical seals work using two sealing surfaces; an inner surface operates within the pump shaft and rotates around the inner shaft wall because it is fixed directly to the shaft. The second surface is mounted to the shaft wall and is fixed, usually on the gland plate. The rotating, inner seal makes contact with the shaft wall against the fixed counterseal providing continuous seal integrity and contact using hydraulic axial force or mechanical force. In addition, springs and elastomeric addendums are utilized [url=http://www.achbanker.com/home.php]www.achbanker.com/home.php[/url] to maintain and stabilize the seal connection.

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Cooling of the seal is essential, as friction creates heat due to the rotating parts and continuous contact. A mechanical seal will use less water than a braided [url=http://www.sandvikfw.net/shopuk.php]hollister sale[/url] packing seal for cooling purposes; however a mechanical seal will typically require water treatment to deal with the discharge.