| 摘要 |
Valve assembly (10) comprises two valve portions, an upper and lower valve portion (12,24), each having a valve housing indicated generally at (16,18) which are generally annular and a valve closure member (20,20') which is pivotally mounted within the housing. The valve closure member (20,20') is in the form of an annular disc and is provided with spindles (22,22') by means of which the valve closure member is pivotally mounted within the housing. The valve closure member (20,20') and the spindles (22,22') are machined from a single piece of metal.
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