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All functions are linked with the turning of the chamber: immediately
after pouring metal into the flask, over pressure comes automatically.
As mentioned before, a pressure impulse on top of liquid metal,
while inside there is still a vacuum, makes the good form-filling
of this system. This means, the flask by itself is a reservoir of
the vacuum. As smaller the flask, as less reservoir is there and
pressure equalisation is quicker. In case of doubt (very delicate
items) or form filling problems take one size bigger for the flask
than necessary from aspect of dimensions.
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