Secondary air control and check valves

Details Secondary air control and check valves Secondary air control and check valves

1992-04-23

1993-04-20

Nilson, Robert G.

Valves and valve actuation

Lost motion between actuator and valve

Check valve with external opening and closing means

137854, F16K 1514

Patent

active

052038726

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.

REFERENCES:
patent: 1385058 (1921-07-01), Warter
patent: 3275291 (1966-09-01), Meijers
patent: 3897042 (1973-07-01), Kachergis
patent: 3964510 (1976-06-01), Roller
patent: 4425620 (1984-01-01), Batcheller et al.
patent: 4477051 (1982-05-01), Yehuda
patent: 4507736 (1985-03-01), Klatt
patent: 4550749 (1985-11-01), Krikorian
patent: 4634093 (1987-01-01), Schintgen
patent: 4887792 (1989-12-01), Kuo

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