Multi condition relief valve

Details Multi condition relief valve Multi condition relief valve

1973-08-06

1976-06-22

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

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

F02B 7510

Patent

active

039642593

ABSTRACT:
An automatically-actuated multi-condition relief valve for controlling flow of forced air to a combustion-engine exhaust pipe immediately upstream of an oxidizing catalytic converter, is described. The valve body has an inlet, an outlet and a bypass port. A single valve stem has a main valve head mounted thereon for controlling flow between the inlet and outlet ports and a bypass valve head for controlling flow between the inlet and the bypass ports. A valve-stem actuating means responds to intake manifold pressure of the combustion engine to allow a biasing means to close the main valve head and open the bypass valve head in response to either a low manifold vacuum -- corresponding to a high engine acceleration -- or a high manifold vacuum -- corresponding to a rapid deceleration. Further, the valve stem actuating means responds to intermediate manifold vacuums to open the main valve and close the bypass valve.
The valve stem actuating means comprises a diaphragm having a manifold-vacuum chamber on one side thereof and a pressure-reference chamber on the other side thereof. An equalizing valve, which is actuated in response to a high manifold vacuum, controls air flow between these two chambers. The bypass-valve head is urged toward a bypass-valve seat by a release spring so that, even when the bypass-valve head is in a closed position, the high inlet-port pressure can open the by-pass valve head to relieve this pressure.

REFERENCES:
patent: 2650581 (1953-09-01), Short
patent: 3433242 (1969-03-01), Voorheis
patent: 3479816 (1969-11-01), Masters
patent: 3486491 (1969-12-01), White
patent: 3507260 (1970-04-01), Walker
patent: 3739797 (1973-06-01), Caldwell
patent: 3805522 (1974-04-01), Sheppard

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