초록 ▼

An improved air flow direction control valve particularly adapted for use with an exhaust gas purifying system on an internal combustion engine to control the direction of flow of air to be mixed into exhaust gas for effecting additional combustion of the uncombusted constituents therein. The valve

An improved air flow direction control valve particularly adapted for use with an exhaust gas purifying system on an internal combustion engine to control the direction of flow of air to be mixed into exhaust gas for effecting additional combustion of the uncombusted constituents therein. The valve essentially comprises a pair of valve members selectively operable to open one of two main outlets and a diaphragm operated shaft for selectively operating the two valve members upon movement between a first and a second position. The shaft is formed with a pair of shoulders which define a reduced diameter shaft portion therebetween, and the two valve members encircle the reduced diameter shaft portion in an oppositely facing relation. The reduced diameter shaft portion is slidable relative to the two valve members and upon movement of the shaft axially into its first position, one of the shoulders thereof is engageable with the first valve member to open the first main outlet, while the other shoulder is engageable with the second valve member to open the second main outlet upon movement of the shaft into its second position. At least one coil spring is provided for urging either of the valve members not engaged by the corresponding shaft shoulder, into a position to keep the corresponding valve outlet closed. The valve further includes a third valve member which is resiliently supported to close an auxiliary valve outlet. According to one embodiment of the invention, the third valve member is operated independently of the shaft, while according to another embodiment, it is operationally associated with the shaft.

대표청구항 ▼

An air flow control valve comprising: a housing having defined therein: an inlet opening, a first outlet opening, a second outlet opening, and a third outlet opening; a shaft axially movable between a first position and a second position and from a neutral position thereof; said shaft having a pair

An air flow control valve comprising: a housing having defined therein: an inlet opening, a first outlet opening, a second outlet opening, and a third outlet opening; a shaft axially movable between a first position and a second position and from a neutral position thereof; said shaft having a pair of spaced mutually facing shoulders thereon; a first valve member coaxial with and encircling said shaft, said first valve member being spaced from one of said shoulders and closing said first outlet opening when the shaft is in said neutral position and being engagable and moved in one direction by said one shoulder when said shaft is moved into said first position to open said first outlet opening; a second valve member coaxial witH and encircling said shaft, said second valve member being spaced from the other one of said shoulders and closing said second outlet opening when the shaft is in said neutral position and being engagable and moved in a direction opposite to said one direction by said other shoulder when said shaft is moved into said second position to open said second outlet opening; a third valve member disposed coaxially with respect to said first valve member and said second valve member, said third valve member fluidly communicating said inlet opening and said third outlet opening when said first outlet opening and said second outlet opening are closed respectively by said first valve member and said second valve member; first resilient means, connected at one end to said first valve member and connected at the other end to said second valve member, for biasing said first and second valve members toward said first and second outlet openings respectively for closing thereof; and second resilient means connected to said third valve member for biasing same.