| 摘要 |
The invention discloses a lifting telescoping tube which comprises a first tube receiving a pressure liquid, a second tube filled with a pressure gas, a first piston affixed to one open end of the second tube having a first through-passage and a second through-passage intercommunicating the first and second tubes, a check valve disposed in the second through-passage for preventing the pressure liquid from flowing into the first tube from the second tube, a second piston provided in the second tube dividing the second tube into a variable-volume liquid chamber and a variable-volume gas chamber.
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