e_Aktuell - Neuheiten_Dichtungstechnik

CHETRA® Mechanical Seals 3 New Developments of Sealing Technology

(1)	„OMEGA“-grooves (protected by DGM 202 16587.6) for gas-lubricated mechanical seals The functioning of gas-lubricated seals is based upon condensing the (barrier-) gas by a suitable geometry of the seal-face grooves and such leading to a defined lift-off of the seal faces. CHETRA’s „Omega“-grooves effect this requirement in an efficient manner, independent of direction of rotation and also in equipment turning at lower speed. At the same time the gas-leakage is kept to a minimum.
(2)	Aktiv-LUB®-System (protected by DGM 202 11805.3) for low-speed equipment and barrier-fluids with poor lubricity In liquid-lubricated double mechanical seals, low speed and bad lubricity of barrier fluids like for example de-mineralised water, may present some problems, i.e. the seal may be running „noisy“. In addition to the unwanted noise, it also means increased wear of seal-faces and thus reduced life-span. CHETRA’s Aktiv-LUB®-System is compensating this deficiency and provides the seal-faces with a sufficient lubricating film. To effect this lubrication, by means of special lubricity-zones and –channels, liquid is guided and distributed, assuring the necessary provision of the seal-faces.	(3)	Integrated feed-system (protected by DGM 202 12246.8) for double mechanical seals Double-seals need for the circulation of the barrier-/quench fluid some arrangement. Usually this is handled by extern circulation pumps or relatively costly feed-screws that need a certain space to be integrated into the seal. The new CHETRA® integrated feed-system uses flat zones within the rotating part, that are located in an axial direction; this assures an excellent feed-performance of the barrier-/ quench fluid. In comparison to usual feed arrangements, the CHETRA®-system has a substantially higher feed performance at the same speed and furthermore it is also effective in the lower speed range. Therefore a considerably better degree of efficiency (exchange) is obtained and thus cooling and lubricating assured.