| 摘要 |
Gas lift cylinder (1) including a body (2), a shaft (4) and a piston assembly (3), comprising a neck (33; 40; 50) which moves longitudinally with the piston assembly (3) and which penetrates in a fixed interior cavity (31) of the body (2) in the final stages of the shaft (4) extension with respect to the body (2), thereby isolating a volume of gas, which is compressed as the shaft (4) continues moving, causing an increase in the pressure of the isolated gas, and a cushioning and braking effect on the shaft (4) in the final stages of its extension. |
