US 5,203,872 A · Secondary air control and check valves

Abstract

A composite check valve and positively closing valve, particularly such a valve for regulating the introduction of secondary air into the exhaust stream of an internal combustion engine at selected times during the operation of the engine. The valve comprises an inlet port, an outlet port, a first valve element movable between open and closed positions for nominally regulating the flow of a fluid between the inlet and outlet ports, and a second valve element for overriding the first element. The second element can function by seating against the same seat as the first element, or by "latching" the first element in its closed position. The disclosed embodiment is a flap valve which is modified by superimposing a rigid, movable valve disk over the flap. The rigid disk is movable between a disengaged position where it may have no immediate function and an override position urging the flap against its seat or otherwise closing the aperture defined by the seat. The rigid disk may also limit the opening of the flap to regulate the rate of fluid flow through the valve.

Claims19

Dependent claims

A valve comprising:

a. an inlet port;
b. an outlet port;
c. a seat having an upstream side in fluid communication with said inlet port and a downstream side in fluid communication with said outlet port, said seat defining an aperture providing fluid communication between said upstream side and said downstream side;
d. a first valve element comprising a flap having obverse first and second sides and deformable between an open position for permitting fluid communication through said aperture, wherein the first side of said flap is unseated from said seat, and a closed position for preventing such communication, wherein the first side of said flap is substantially seated on said seat and substantially blocks said aperture;
and
e. a second valve element being positioned between said first valve element and said outlet port, translation of said second valve element being independent of said deformability of said flap of said first valve element, said second valve element selectively operatively engagable with said flap for maintaining said flap in said closed position and preventing said deforming of said flap.

3 more elements

A composite check valve and positively closing valve comprising:

a. an inlet port;
b. an outlet port;
c. a seat having an upstream side in fluid communication with said inlet port and a downstream side in fluid communication with said outlet port, said seat defining an aperture providing fluid communication between said upstream side and said downstream side;
d. a first valve comprising a flap having obverse first and second sides and deformable between an open position for providing fluid communication between said inlet port and said outlet port, wherein the first side of said flap is unseated from said seat, and a closed position for preventing such communication, wherein the first side of said flap is substantially seated on said seat and substantially blocks said aperture;
and
e. a second valve comprising an element not mechanically linked to said flap of said first valve, said element of said second valve being positioned between said flap of said first valve and said outlet port, translation of said element of said second valve being independent of said deformability of said flap of said first valve, said element of said second valve selectively operatively engagable with said flap of said first valve for maintaining said flap in said closed position and preventing said deforming of said flap.

3 more elements

Dependencies are inferred from the claim text.

Secondary air control and check valves

Life of this patent

Secondary air control and check valves

Life of this patent

Abstract

Claims19