| 摘要 |
A vacuum valve comprises a valve body ( 1 ) with an inner cavity ( 4 ) through which a main passageway leads between an inlet ( 2 ) and an outlet ( 3 ) of the vacuum valve and with a main valve seat ( 6 ) which surrounds the main passageway, a main closing member ( 5 ) which is adjustable in the inner cavity ( 4 ) of the valve body between an open position, in which it is lifted from the main valve seat ( 6 ) and in which the main passageway through the vacuum valve is open, and a closed position, in which it tightly contacts the main valve seat ( 6 ) and in which the main passageway through the vacuum valve is closed, and which has an inner cavity ( 10 ) through which an additional passageway leads and an additional valve seat ( 14 ) surrounding the additional passageway, an additional closing member ( 11 ) which is adjustable in the inner cavity ( 10 ) of the main closing member ( 5 ) between an open position, in which it is lifted from the additional valve seat ( 14 ) and in which the additional passageway through the vacuum valve is open, and a closed position in which it tightly contacts the additional valve seat ( 14 ) and in which the additional passageway through the vacuum valve is closed, wherein the additional passageway runs through a changeable intermediate space ( 43 ) between the main closing member ( 5 ) and the additional closing member ( 11 ), and the size of this intermediate space ( 43 ) is changeable by means of a rotation of the additional closing member ( 11 ) relative to the main closing member ( 5 ).
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