Air flow/check valve

Details Air flow/check valve Air flow/check valve

1990-10-25

1991-11-19

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60289, 137510, F01N 322

Patent

active

050655752

ABSTRACT:
An air flow/check valve for an exhaust emission system combines flow and check functions into a single valve which is especially well-suited for use with an electric motor driven air pump. The valving mechanism is operated by a fluid actuator, and pressure conditions in the actuator are controlled by sensing the pressure differential across the valving mechanism to close the valving mechanism when exhaust back pressure is indicative of causing potentially damaging backflow to the air pump. Several embodiments of the invention are disclosed.

REFERENCES:
patent: 3931710 (1976-01-01), Hartel
patent: 4104879 (1978-08-01), Nohira
patent: 4370102 (1983-01-01), Sasaki
patent: 4589254 (1986-05-01), Kume

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