Check valve

Details Check valve Check valve

1996-03-08

2001-03-13

Hepperle, Stephen M. (Department: 3753)

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

C137S895000, C137S907000, C417S159000

Reissue Patent

active

RE037090

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to valves, and will have special application to check valves used in internal combustion engines.
BACKGROUND OF THE INVENTION
Internal combustion engines have long employed air flow conduits to provide vacuum assist for automobile subsystems, such as brakes, automatic transmissions and others. These systems often employed chick valves located along the air flow conduit to prevent subsystem back pressure from reaching the engine. A typical check valve of this sort is described in U.S. Pat. No. 3,889,710.
Prior check valves employed either a continuous diameter airway or employed multiple valves and hoses to create a venturi effect and act as a vacuum booster for the subsystem to which it was associated. Space limitations in the automobile engine compartment all but preclude the use of multiple valve-hose system, while the prior art continuous diameter airways did not provide the increased power boost desired to implement the brakes or other subsystem.
SUMMARY OF THE INVENTION
This invention provides for a space-saving vacuum booster check valve located along a conduit between the air intake manifold and the brake booster. The check valve includes three or more ports connected by hoses to the air intake, block, and one or more vehicle subsystems. Venturi tubes in the valve body connect the various ports to provide a vacuum booster effect to the subsystem. A common concave valve seat and diaphragm serve to prevent back pressure from the subsystem from entering the main conduit between the air intake and the engine block.
Accordingly, it is an object of this invention to provide for a novel and improved check valve assembly.
Another object is to provide a check valve for an internal combustion engine which acts as a vacuum booster for vacuum assisted subsystems.
Another object is to provide a check valve for an internal combustion engine which is efficient, economical, durable, and still meets the minimal size specifications of an automobile engine compartment.
Other objects will become apparent upon a reading of the following description.


REFERENCES:
patent: 1845969 (1932-02-01), Hueber
patent: 3042077 (1962-07-01), Waddington et al.
patent: 4211200 (1980-07-01), Rocchio et al.
patent: 4913192 (1990-04-01), Vaura
patent: 5108266 (1992-04-01), Hewitt

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