| 摘要 |
In a ball valve made of a plastic material and having, as the principal components thereof, a valve body 1, a ball 2, carriers 3 contacting with said ball and connecting with body caps 4, a valve seat 6, a stem 8 and a handle 7 attached to said stem, an improvement is disclosed which comprises providing the carrier 3 disposed on each side of said ball with a flange 13 and interposing an elastic seat gasket 12 between the valve body 1 and the flange 13 of each carrier 3.
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