Shut-off valve unit for a circuit for injecting air in the exhau

Details Shut-off valve unit for a circuit for injecting air in the exhau Shut-off valve unit for a circuit for injecting air in the exhau

1995-11-15

1997-12-23

Kwon, John T.

Power plants

Internal combustion engine with treatment or handling of...

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

137455, 251 614, F01N 310

Patent

active

056996640

ABSTRACT:
A shut-off valve unit for a circuit for injecting air into an exhaust system of an internal combustion engine has a casing (9, 29) with a first chamber (10), a second chamber (24) and a third chamber (27). The valve rod (18) forms a passage (43) for communicating air between the first chamber (10) and the second chamber (24). The opening and closing of valve (19) with respect to valve seat (21) is controlled by movement of the membrane (12); which also controls communication between the second chamber (24) and the third chamber (27).

REFERENCES:
patent: 3748855 (1973-07-01), Day
patent: 3905193 (1975-09-01), Heilman et al.
patent: 3924408 (1975-12-01), Beiswenger et al.
patent: 4070830 (1978-01-01), Beiswenger
patent: 4141214 (1979-02-01), Mitsuda et al.

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