Manually-operated valve for extremely pure substances, includes guidance system promoting highly accurate straight-line movement, with sealed bellows to exclude contaminants

摘要

The drive spindle in the drive casing is connected to the valve disc. The valve rod is led in a guide inside the valve casing, where it moves axially and rotates. It is guided in rotation in a recess in the drive spindle. The valve rod is led in the drive casing where it is fixed detachably with a centering screw. This is guided near the threaded spindle. The guides lie as far apart as possible.