| 摘要 |
The device has a housing (200) made of a material, and a piston (100) movable along a borehole (300) in the housing. A leakage-prone sealing region (110) is provided between the housing and the piston, and separates zones with intermittently different fluid pressures from each other in the borehole. The piston and/or the housing are made of another material at the sealing region along a borehole wall. The latter material has thermal expansion coefficient higher than that of the former material. |
