| 摘要 |
A butterfly valve assembly particularly suitable for large size fluid-carrying pipes. Instead of using a unitary disc as the rotatable valve element, two offset half discs are provided, staggered by the diameter of a pipe or sleeve surrounding and connected to the shaft which is rotated to open and close the valve. Sealing half-rings connected to each half disc and projecting beyond their perimeters abut against a radially inwardly extending shoulder on an interconnecting pipe or housing between two confronting large pipe ends. Thus no rubbing of the sealing parts results and a positive seal is provided. Means are provided for access to the butterfly disc assembly for replacing the sealing half rings without taking the entire assembly from the line.
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