| 摘要 |
A housing arrangement for a butterfly valve including an annular valve housing, a valve rod rotatably and axially inserted through the valve housing, the valve rod crossing at right angles with a fluid passage, and a valve member in a substantially disk form, the valve member sliding tightly on the inner surface of the valve housing as the valve rod rotates, and the valve housing is built up of a valve housing body which includes bearing bushes and is of a given profile in section and a valve rod supporting tube, the valve housing body being obtained by expanding and turning over a metal tube material in the outward direction until its both end faces are brought into contact with each other at substantially its central portion and welding the faces of contact together.
|
