| 摘要 |
The surface of a hydraulic cylinder (2) is enclosed with a cylindrical casing (8). A fluid, preferably a thixotropic dielectric hydrophobic fluid (56) which retains a gel structure when static, has a specific gravity greater than water and aqueous corrosion fills the annular space between the cylinder surface (2) and the casing (8), preventing water that may be rich in bacteria, from reaching the cylinder surface (2). A fluid conduit (42) between the annular space (7) and a reservoir (54) is provided and the fluid fills the reservoir to a predetermined level such that water, hydraulic fluid in the system may be detected by a rise in the predetermined level. The water or hydraulic fluid can be easily removed as it will float on the top of the fluid in the reservoir.
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