| 摘要 |
A valve stem sealing unit 65 for forming a seal round a valve stem (fig.3d, 41, 43) of a poppet valve (fig.1, 19, 21) in an engine having a body (fig.1, 5, 7, 13) and operated by a working fluid, the valve stem sealing unit 65 including: a housing 67 defining a through passage 79 running from end to end, and arranged to receive the valve stem; a first seal 85 arranged to seal between the valve stem and the housing to prevent egress of the working fluid from the housing; and a second seal 89 arranged to form a seal between the housing 69 and a body of the engine to prevent egress of the working fluid from the other end of the housing 69. Also claimed is a fluid engine comprising a fluid collecting system, comprising a cover forming a sealed space around a leakage point, means for condensing fluid leaking into the cover, and means for collecting the condensed fluid. |
