Patent ID: 8317557
Filing Date: 2012-11-27
Classification: B63H,F01N

Abstract:
1. An anti-ingestion system for a marine drive having an internal combustion engine having an exhaust system discharging exhaust at an exhaust outlet below the surface of a body of water in which the marine drive is operating, and having a cooling system drawing cooling water from the body of water and pumping the cooling water through a water conduit to an exhaust mixing point to discharge into and mix with exhaust from said exhaust system, an anti-ingestion valve connected in communication with said water conduit, said anti-ingestion valve being operated by differential pressure thereacross to a closed condition when said engine is operating in an on state and said cooling water is being pumped through said water conduit to said exhaust mixing point, said anti-ingestion valve in said closed condition blocking passage of cooling water therepast, said anti-ingestion valve being operated by differential pressure thereacross to an open condition when said engine is in an off state and said cooling water is not being pumped through said water conduit to said exhaust mixing point, said anti-ingestion valve in said open condition permitting passage of air therethrough and communication of atmospheric pressure through said water conduit to said exhaust mixing point to relieve vacuum in said exhaust system wherein said anti-ingestion valve comprises a movable valve member moving in a first direction to said closed condition, and moving in a second opposite direction to said open condition, wherein said valve member moves in each of said first and second directions in response to differential pressure and without a biasing spring.