Exhaust gate valve apparatus for a personal watercraft

Details Exhaust gate valve apparatus for a personal watercraft Exhaust gate valve apparatus for a personal watercraft

2007-01-30

2007-01-30

Avila, Stephen (Department: 3617)

Marine propulsion

Means for accomodating or moving engine fluids

Means for handling exhaust gas

Reexamination Certificate

active

11223503

ABSTRACT:
An exhaust gate valve apparatus of a water jet propulsion-driven watercraft is provided that is capable of positively closing an exhaust port with a valve body when an engine is stationary and widely opening the valve body when the engine runs. In the watercraft, an exhaust port of a tail pipe is arranged to face an opening in a top wall of a pump chamber. The exhaust gate valve apparatus includes a valve body, valve body support flange, pressure device, and a jet water expelling device. The valve body support flange attaches the valve body to the top wall. The pressure device urges the valve body to a closed position. The jet water expelling device diverts jet water from a water jet pump and opens the valve body using the jet water thus diverted, counteracting a pressing force of the pressure device and opening the valve body.

REFERENCES:
patent: 6659821 (2003-12-01), Nakajima
patent: 2003/0013363 (2003-01-01), Yokoya et al.
patent: 2004/0048527 (2004-03-01), Yokoya
patent: 07-246996 (1995-09-01), None

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