| 摘要 |
A cooling water flow control device for a water cooled outboard motor comprising a valve seat for a thermostatic cooling water control valve that provides a wide opening for the passage of foreign matter trapped between the valve stem and seat when the cooling water passing over the valves exceeds a selected limit. The valve seat comprises an annular opening having a side wall smaller at the top than the bottom and varying in diameter. A step in the side wall provides an abrupt enlargement in the water passage through the valve for the passage of foreign matter blocking the valve.
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