Combustion engine construction

Claim 1

In a combustion engine, in combination, an intake conduit for a stream of combustion air; throttle means interposed in said intake conduit for regulating the flow of combustion air therethrough; an exhaust conduit for exhausting combustion gases from the engine; first passage means communicating with said intake conduit downstream of said throttle means; second passage means communicating with said intake conduit upstream of said throttle means; third passage means communicating with said exhaust conduit; valve means comprising a housing having a chamber provided with a first and second opening which communicate with said second and third passage means, respectfully, a tubular element extending from said housing and having an open end which communicates with said chamber and an interior in communication with said first passage means, a first and a second valve seat respectively surrounding said open end and said second opening, a valve member movable in said chamber between a first position in which it engages said first valve seat, preventing communication between said chamber and said interior and permitting communication between said second and said third passage means, and a second position in which it engages said second valve seat, preventing communication between said chamber and said third passage means and permitting communication between said first and said second passage means, an operating member connected with said valve member and extending axially through said tubular element; and actuating means for moving said operating member in a tense effecting movement of said valve member between said first and second positions thereof.