Patent ID: 8469336
Filing Date: 2013-06-25
Classification: F02D,F02M,F16K,Y10T

Abstract:
1. A valve assembly comprising: a housing formed with a gas passage in which exhaust gas flows and a stem hole which is open to the gas passage and extends in a direction intersecting with an extending direction of the gas passage; a valve including a stem movably inserted to the stem hole and a valve body capable of adjusting a sectional area of the gas passage connected to the stem; and a heat resistant filter which is disposed between an inner circumferential surface of the stem hole and an outer circumferential surface of the stem and which collects dust in the exhaust gas, wherein: the heat resistant filter is cylinder-shaped; the housing is formed of cast iron; a reinforcement collar is further provided between the inner circumferential surface of the stem hole and an outer circumferential surface of the heat resistant filter; the reinforcement collar has higher rigidity than the heat resistant filter; at least a surface of the reinforcement collar is formed of a highly corrosion resistant material having higher corrosion resistance than cast iron; the reinforcement collar is entirely housed inside the stem hole; the highly corrosion resistant material includes one or more material selected from the group consisting of stainless steel, aluminum oxide, carbon, and nickel-phosphorus alloy; and the valve is a butterfly valve in which the stem moves in a rotational direction in the stem hole.