| 摘要 |
In order to allow a water cooled marine engine (2) to run without risk of overheating when the craft is out of the water, an on board cooling water supply is connected via a pipe 7 with a first inlet port (4) of a change over valve (3). A second inlet port (5) provides for sea-water (normal) supply of cooling water and an outlet (6) directs the water to the engine. When the craft is launched, water is supplied via the second port (5) to the outlet 6, and when the craft is not launched, water supplied via the port 4 urges a piston closure member to a position in which the ports 4 and 6 communicate and the port 5 is isolated. <IMAGE> |
