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We use the roughing valve when evacuating a vacuum furnace chamber from atmospheric force. It is a so-called “rough” vacuum (normally in the range of ten-2 to ten-three Torr).
In some circumstances, this degree of vacuum is sufficient to operate the meant method. In other purposes, a diffusion pump is added to the pumping bundle. And the roughing pump is utilized 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” allows the mechanical pump to return to atmospheric force. We use the pump when shutting down a vacuum furnace pumping technique. Or for servicing on the pumps or the furnace appropriate.
If present, we switch off the diffusion pump first and let the pump to great. And then we change off the mechanical pump. Bringing Vccuum pump stopped mechanical pump to atmospheric pressure. It prevents mechanical pump oil from currently being drawn back again into the foreline.
We ought to clsoe he holding valve and the foreline valve during the operation. As a result we maintain the diffusion pump, cold lure and baffle underneath higher vacuum. This assures a clean system when starting up up at some later on day.
The mechanical pump vent valve serves to confess ambiance to the roughing line. It provides the mechanical pump to atmospheric strain. We use mechanical pump when shutting down the method. And turn off the diffusion pump and allow it to amazing. Then we turn off the mechanical pump. So we carry the stopped mechanical pump to atmospheric stress. It prevents mechanical pump oil from getting drawn again into the foreline.
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