Exhaust gas recirculation system

Details Exhaust gas recirculation system Exhaust gas recirculation system

1997-01-21

1998-05-12

Walton, George L.

Valves and valve actuation

Fluid actuated or retarded

Flexible wall expansible chamber reciprocating valve actuator

123568, 137240, F16K 31126, F02M 2507

Patent

active

057495637

ABSTRACT:
The invention relates to an exhaust gas recirculation system as may be used in an engine of an automobile or the like. A housing is provided with an exhaust gas recirculation passage, which may be opened or closed by a valve connected to a diaphragm. The valve includes a rod which is guided by a guide bushing for movement back and forth. A securing protective cover mounted on the housing and a cup-shaped movable protective cover mounted on the diaphragm prevent ingress of a foreign matter between the guide bushing and the valve. An air passage is formed in the movable protective cover. With this construction, the provision of the air passage prevents a negative pressure from prevailing in the movable protective cover, thus preventing a foreign matter such as water or dust which may be deposited on the housing or the like from being drawn into a clearance between the guide bushing and the valve.

REFERENCES:
patent: 3902696 (1975-09-01), Ito et al.
patent: 4052969 (1977-10-01), Ando et al.
patent: 4120480 (1978-10-01), Ando et al.
patent: 4239181 (1980-12-01), Brakebill
patent: 4497335 (1985-02-01), Masuda

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