Wastegate with reduced leakage current
AssigneeCaterpillar Energy Solutions GmbH
InventorFriedrich Schaefer
Life of this patent
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Abstract
Valves for gas engines are disclosed, in particular for wastegates arranged upstream of a turbocharger. Accordingly, a valve for a gas engine, comprises a metal housing having an opening for providing a fluid flow out of the valve, and a metal valve member configured for adjustably restricting the fluid flow through the opening, wherein the housing is made of a first material comprising a steel and wherein the valve member is made of a second material having a thermal expansion coefficient being lower than the first material. By providing the valve member and the valve housing with materials with different thermal expansion coefficients, the expansion of the valve member may be reduced during a rapid temperature increase or heating up of the valve member e.g. when the gas engine is started or accelerated.
Claims10
A valve for a gas engine, comprising
- a metal housing having an opening for providing a fluid flow out of the valve, and a metal valve member configured for adjustably restricting the fluid flow through the opening, wherein the housing is made of a first material comprising a steel and wherein the valve member is made of a second material having a thermal expansion coefficient being lower than the first material;
- wherein the valve comprises a gap between the valve member and the housing, when the valve member is in a position maximally restricting the fluid flow and wherein the first material and/or the second material is predefined by a gap distance between the valve member and the housing, when:
- the gas engine is in a start-up phase or undergoes a load change;
- and
- a temperature of the fluid is between 500° C. to 700° C. and/or a temperature of the valve member is between 410° C. and 560° C.
Dependencies are inferred from the claim text.