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I costi per i tetti in metallo nel 2014 variavano a seconda del tipo di materiale e della tecnologia di produzione utilizzata. Ad esempio, i tetti in lamiera zincata erano generalmente pi economici rispetto ad altre opzioni come quelli in alluminio o rame. Le cifre indicavano che i prezzi oscillavano tra i 20 e i 50 dollari al metro quadrato, a seconda della complessit del design e delle finiture richieste. I produttori cinesi, grazie alla loro efficienza produttiva e ai costi di manodopera relativamente bassi, riuscivano a mantenere prezzi accessibili pur garantendo un buon livello qualitativo.
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The basic principle of an oil seal is fairly straightforward. It is installed adjacent to the bearing, with the flexible lip against the rotating shaft and the casing pressed into the housing to hold the seal in place. It’s important that the sealing lip is lubricated to prevent it from overheating as a result of any generated friction. It’s also crucial to understand which type of seal is appropriate for your particular machinery. Before selecting your seal, consider the environment, temperature, pressure and shaft speed of your machine, as well as the type of medium the seal will come into contact with during operation. These considerations will all determine the size, colour, and type of lip material or sealing element to choose, and whether it can be sealed in or sealed out.