| 摘要 |
A pipe coupling comprises a socket including a cylindrical main body having an axial bore for a fluid, an annular valve seat at the forward end, a ball type valve body rotatable relative to the valve seat and having a through hole and a casing fitted over the main body and rotatably retaining the ball valve in cooperation with the valve seat, and a plug inserted in the through hole. The casing has a long hole including a wider area and a narrower area. The ball valve communicates the through hole with the axial bore when the trough hole is aligned with the narrower area and closes the axial bore when the trough hole is aligned with the wider area. The coupling comprises a guide for guiding the ball valve along the long hole from a position in which the through hole is aligned with the wider area.
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