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We use the roughing valve when evacuating a vacuum furnace chamber from atmospheric strain. It is a so-called “rough” vacuum (usually in the selection of ten-two to ten-3 Torr).
In some cases, this degree of vacuum is adequate to operate the intended process. In other apps, a diffusion pump is additional to the pumping package deal. And the roughing pump is used prior to connecting the chamber to the diffusion pump.
The mechanical pump vent valve serves to acknowledge atmosphere to the roughing line. Hence “breaking vacuum” permits the mechanical pump to return to atmospheric stress. Ovens use the pump when shutting down a vacuum furnace pumping technique. Or for upkeep on the pumps or the furnace suitable.
If present, we flip off the diffusion pump very first and permit the pump to awesome. And then we change off the mechanical pump. Bringing the stopped mechanical pump to atmospheric force. It stops mechanical pump oil from currently being drawn back again into the foreline.
We ought to clsoe he holding valve and the foreline valve in the course of the operation. As a result we preserve the diffusion pump, cold trap and baffle below substantial vacuum. This assures a clean program when beginning up at some afterwards date.
The mechanical pump vent valve serves to admit atmosphere to the roughing line. It provides the mechanical pump to atmospheric pressure. We use mechanical pump when shutting down the system. And flip off the diffusion pump and enable it to awesome. Then we change off the mechanical pump. So we carry the stopped mechanical pump to atmospheric force. It stops mechanical pump oil from currently being drawn back again into the foreline.
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