Importance

Loading Importance Indicators...

Abstract

An improved stub shaft to disc connection for a butterfly valve is provided having a valve disc with a hub. The valve disc is adapted to be rotated between an open and closed position. A valve disc seat is adapted to engage the valve disc in the closed position. A shaft is joined to the valve disc to permit torque to be transmitted to the valve disc from a point remote therefrom. The shaft is joined to the valve disc by forming the valve disc with a portion of increased thickness (hub) relative to the main portion of the disc. The portion of increased thickness is formed at a point adjacent the circumference of the disc. A hole (bore) is then machined into the portion of increased thickness parallel to the disc. The bore consists of a single larger aperture contiguous with a plurality of smaller apertures, the plurality of smaller apertures, positioned at a point more distal the circumference of the disc than the single larger aperture. The single larger aperture has a diameter slightly larger than the diameter of the shaft. The end of the shaft being inserted into the hub bore has mounted into it a plurality of dowels. The diameter, number and spatial placement of these dowels is identical to that of the plurality of smaller apertures present in the hub bore. The diameter of the dowels is slightly less than the diameter of the smaller apertures. The shaft is inserted into the single larger aperture of the hub bore of the valve disc and pressed in. The dowels, are of such a length and diameter that they insert and seat firmly into the smaller apertures of the valve disc hub preventing relative movement between the disc and shaft. This engagement of the shaft and the dowels in the single larger and plurality of smaller apertures of the hub bore respectively, forms a secure, although not permanent, connection between the shaft and the disc.

Loading the Abstract Image...

First Claim