| 摘要 |
A valve having at least one passage through the valve body and terminating in a port at one end of the valve body, a stem means extending through the valve body having a stem operating means on one end thereof and having the other end thereof terminating beyond the one end of the valve body and a closure means mounted on the free end of the stem means adapted to be rotated through an arc from a first position removed from the port to a second position adjacent the port, and having a closure element thereon adapted to close the port in the second position, whereby rotation of the stem moves the closure means from a first position, at which the fluid is admitted to the passage through the port, to the second position, at which fluid is prevented from entering the passage through the port. A system including the valve is provided for transporting fluid to or from a vessel containing the fluid, such as a sample of the fluid, from the vessel and at least one flow line is connected to the end of the passage opposite the end opening into the vessel for the transport of fluid to and from the passage. The flow line preferably includes means for introducing a purge fluid through the passage.
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