Flow control valve for exhaust gas recirculation system
A flow control valve is provided for use in an exhaust gas recirculation system of an internal combustion engine, whereby a constant flow of the recirculating gas may be maintained. The valve comprises a first and second valve chamber separated by a flow orifice, with a valve body for opening and closing of the flow orifice. Exhaust gas entering the first chamber passes through the orifice into the second chamber and to the engine intake system. Located upon one side of the valve body is a diaphragm responsive to exhaust gas pressure in the first chamber, which moves the valve body. A pressure compensating piston located in the second valve chamber balances the effects of the intake manifold pressure upon the valve body. A throttling orifice defines the entrance of the exhaust gases into the first valve chamber, and a spring applys a force tending to counterbalance the force, slightly higher than the force of atmospheric pressure, acting upon the diaphragm.
- Assignee:
- Toyota Jidosha Kogya Kabushiki Kaisha
- Patent Number(s):
- US 3928966
- OSTI ID:
- 7365519
- Country of Publication:
- United States
- Language:
- English
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