A butterfly valve (141, 145) for controlling a gas stream of a turbocharger system, comprising: a housing with a valve passageway through which the gas stream passes from one end of the valve (141, 145) to the other end of the valve (141, 145), the valve passageway including: a shaft axis; bores (54, 56) on opposite sides of the passageway, the bores (54, 56) being aligned along the shaft axis with one another; lap seating surfaces (48, 50) on opposite sides of the passageway facing opposite ends of the valve (141, 145), the shaft axis being between the lap seating surfaces (48, 50); a butterfly valve element in the valve passageway between the bores (54, 56), the butterfly valve element having counter bores (66, 68) on opposite sides of the butterfly valve element aligned along the shaft axis; two bushings (60, 62), each bushing (60, 62) being received in a different one of the bores (54, 56) and extending from the bore (54, 56) inwardly into a different one of the counter bores (66, 68) of the butterfly valve element; a shaft extending along the shaft axis and in each of the bushings (60, 62) so as to journal the shaft relative to the housing; wherein there is a first slip fit creating a first rotary joint between the bushings (60, 62) and the counter bores (66, 68) and a second slip fit creating a second rotary joint between the shaft and the bushings (60, 62); characterized in that the butterfly valve element can, to a limited extent, turn slightly relative to the shaft and move along the axis relative to the shaft, to insure that in a closed position the butterfly valve element seats flatly against the lap seating surfaces (48, 50), and wherein the first slip fit is a close running fit and the second slip fit is a looser fit than the first slip fit. a housing with a valve passageway through which the gas stream passes from one end of the valve (141, 145) to the other end of the valve (141, 145), the valve passageway including: a shaft axis; bores (54, 56) on opposite sides of the passageway, the bores (54, 56) being aligned along the shaft axis with one another; lap seating surfaces (48, 50) on opposite sides of the passageway facing opposite ends of the valve (141, 145), the shaft axis being between the lap seating surfaces (48, 50); a shaft axis; bores (54, 56) on opposite sides of the passageway, the bores (54, 56) being aligned along the shaft axis with one another; lap seating surfaces (48, 50) on opposite sides of the passageway facing opposite ends of the valve (141, 145), the shaft axis being between the lap seating surfaces (48, 50); a butterfly valve element in the valve passageway between the bores (54, 56), the butterfly valve element having counter bores (66, 68) on opposite sides of the butterfly valve element aligned along the shaft axis; two bushings (60, 62), each bushing (60, 62) being received in a different one of the bores (54, 56) and extending from the bore (54, 56) inwardly into a different one of the counter bores (66, 68) of the butterfly valve element; a shaft extending along the shaft axis and in each of the bushings (60, 62) so as to journal the shaft relative to the housing; wherein there is a first slip fit creating a first rotary joint between the bushings (60, 62) and the counter bores (66, 68) and a second slip fit creating a second rotary joint between the shaft and the bushings (60, 62); characterized in that the butterfly valve element can, to a limited extent, turn slightly relative to the shaft and move along the axis relative to the shaft, to insure that in a closed position the butterfly valve element seats flatly against the lap seating surfaces (48, 50), and wherein the first slip fit is a close running fit and the second slip fit is a looser fit than the first slip fit.