Patent ID: 8459227

Claim:
A slide valve for aspirating internal combustion engines, the slide valve comprising: a tubular body adapted to be slidably disposed within a tubular tunnel or sleeve, said body comprising at least one aspiration port and an elongated, internal tubular passageway in fluid flow communication with said aspiration port for intaking or exhausting gases; an open connecting rod section with an interior enabling mechanical connection to a rod for reciprocating the slide valve; a closed interior wall that separates the connecting rod section from the internal tubular passageway; a port section proximate said closed wall in which said at least one aspiration port is defined, wherein an arcuate cutout defined in said port section functions as said aspiration port, the cutout contacting said closed wall and the cutout comprising at least one radiused arch; a tubular midsection adjacent the port section; an open tubular section adjacent said midsection that is in fluid flow communication with said tubular passageway; said elongated, internal tubular passageway extending coaxially longitudinally between said closed wall and a spaced-apart open valve end, the open valve end comprising radiused lips; at least one concentric ring groove externally separating the valve rod section from the port section; at least one concentric ring groove externally separating the valve port section from the adjacent valve midsection; at least one concentric ring groove externally separating the valve midsection from the valve open section; and, at least one sealing ring seated in each of each of said ring grooves.