Claims
- 1. A pressure balancing metering subassembly for use with a modular actuator of an EGR valve, said pressure balancing metering subassembly comprising:a metering base defining a metering port and a metering chamber; an elongate poppet having a first end and a second end, said first end normally disposed in sealing engagement with said metering port, said poppet being selectively reciprocated to disengage said first end from sealing engagement with said metering port to thereby fluidly connect said metering port with said metering chamber; and pressure balancing means balancing a pressure at said first end of said poppet with a pressure at said second end of said poppet, said pressure balancing means comprising: a cylinder having a top and a cylindrical sidewall; a piston disposed within said cylinder, said piston sealingly engaging an inner surface of said cylindrical sidewall of said cylinder, a pressure chamber being defined between said piston, said cylindrical sidewall and said to top of said cylinder, said second end of said poppet being disposed within said pressure chamber, said piston being one of in abutting engagement with and coupled to said poppet; and an axial cavity defined by said poppet, said axial cavity extending from said first end to said second end to thereby place said pressure chamber into fluid communication with said metering port; wherein said piston comprises a substantially cylindrical piston wall, a top surface and a bottom surface, said top surface and said bottom surface being interconnected by said piston wall, a conical inner surface disposed between said bottom surface and said top surface, said bottom surface defining an orifice therethrough, said orifice extending from said bottom surface to said conical inner surface, said piston sealingly engaging an inner surface of said sidewall of said cylinder, said pressure chamber conjunctively defined by said top surface of said piston, said inner surface of said piston, a portion of said inner surface of said sidewall of said cylinder, and said top of said cylinder, said poppet extending through said orifice to thereby dispose said second end of said poppet within said pressure chamber.
- 2. The pressure balancing metering subassembly of claim 1, wherein said conical inner surface of said piston has a first surface area, said first end of said metering poppet having a second surface area, said first surface area being substantially equal to said second surface area.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of U.S. Provisional Patent Application Ser. No. 60/184,530, filed Feb. 24, 2000.
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Number |
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6178956 |
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Jan 2001 |
B1 |
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Provisional Applications (1)
|
Number |
Date |
Country |
|
60/184530 |
Feb 2000 |
US |