Multistage catalytic reactor having a pressure responsive gas flow control valve therein
AssigneeCaterpillar Tractor Co.
InventorRichard A. Cemenska
Life of this patent
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Abstract
A multistage catalytic reactor for purifying exhaust gas has a passage for communicating exhaust gas to first and second catalyst bed assemblies, and a valve for automatically maintaining flow of the gas solely through the first catalyst bed assembly in response to a first operating condition and for automatically passing the gas through the first and second catalyst bed assemblies in response to a second operating condition, shifting of said valve being free of external control.
Claims9
In a multistage catalytic reactor (10) for purifying exhaust gas having first and second catalyst bed assemblies (36,38) and an inlet passage (30) for communicating exhaust gas to the catalyst bed assemblies (36,38), the improvement comprising:
- valve means (70/88) for automatically maintaining gas flow solely through the first catalyst bed assembly (36) in response to a pressure differential substantially across the first catalyst bed assembly (36) by remaining in a closed position, said pressure differential being below a preselected value, and for moving to an open position and establishing gas flow through the first and second catalyst bed assemblies (36,38) in response to a pressure differential of at least said preselected value, said valve means (70/88) being located in said inlet passage (30) between the first and second catalyst bed assemblies (36,38).
A multistage catalytic reactor (10) for purifying exhaust gas comprising:
- first and second catalyst bed assemblies (36,38);
- element means (24/98,102) defining an inlet passage (30) in communication with said catalyst bed assemblies (36,38),
- valve means (72,32) located in said inlet passage (30) for maintaining gas flow solely through the first catalyst bed assembly (36) by remaining in a closed position, establishing gas flow through both the first and second catalyst bed assemblies (36,38) by moving to an open position, and being responsive solely to gravity and to a pressure differential substantially across the first catalyst bed assembly (36) for automatically opening when said pressure differential is at or above a preselected value and closing when said pressure differential is below said preselected value.
Dependencies are inferred from the claim text.