Patent ID: 8342206
Filing Date: 2013-01-01
Classification: F02D,F02M,F16K,Y10T

Abstract:
1. A valve for a plenum, the valve comprising: a large butterfly valve element pivotally supported in the plenum by at least one rod, the large butterfly valve element includes an opening for accommodating a small butterfly valve element; the small butterfly valve element coupled to the rod by a shaft, the shaft includes a recess that accommodates the small butterfly valve element, the recess of the shaft disposed between two opposing walls, each wall providing a clearance between the small butterfly valve element and the shaft to permit limited rotation of the shaft before the small butterfly valve element engages at least one wall of the recess of the shaft; wherein, after the small butterfly valve element engages a wall of the recess of the shaft, further rotation of the shaft results in rotation of the large butterfly valve element.