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US 6,311,950 B1Granted
Fluid metering device
AssigneeSiemens Aktiengesellschaft
InventorsAndreas Kappel, Bernhard Fischer, Bernhard Gottlieb, Randolf Mock, Eric Chemisky, Hans Meixner
Life of this patent
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Abstract
A fluid metering device that employs a sealing element for delivering a metered dose of a pressurized fluid. The sealing element includes a metal bellows sealing element or metal bellows that attaches to a valve needle and a housing. The metal bellows includes a number of corrugated elements for sealingly guiding said valve needle as the valve needle moves to deliver the metered dose of pressurized fluid.
Claims21
A metering device for a pressurized fluid, comprising:
- a housing having a chamber therein that contains a fluid, said chamber having an interior at an internal pressure and an exterior at an external pressure, said internal pressure being larger than said external pressure;
- a valve needle proceeding through said chamber having a first end and a
- second end;
- a valve seat in said housing, in fluid communication with said chamber, said second end of said valve needle being disposed to open and close said valve seat by displacement of said valve needle;
- a metal bellows forming a bushing element for said first end of said valve needle from said exterior to said interior of said chamber and sealing said chamber;
- and
- said first end of said valve needle being in communication with a driving force generator to deflect said metal bellows and displace said valve needle.
4 more elements
Dependencies are inferred from the claim text.