Valve device

A valve device that increases or decreases a flow rate of EGR gas, the valve device comprising:

• a housing that includes
• a first upstream passage into which the EGR gas cooled by an EGR cooler flows,
• a second upstream passage into which the EGR gas that bypasses the EGR cooler flows,
• a junction connected to each of a gas-flow downstream side of the first upstream passage and a gas-flow downstream side of the second upstream passage, and
• a downstream passage connected to the first upstream passage and the second upstream passage via the junction;
• a bypass valve body that opens and closes the second upstream passage;
• an EGR valve body that is provided in the downstream passage, rotates around an EGR valve axis, is controlled to rotate within a warming-up rotational range, which is predetermined, during warm-up of an engine, and reduces an opening degree of the downstream passage as the EGR valve body rotates to one side in a circumferential direction of the EGR valve axis within the warming-up rotational range;
• and
• an interlocking portion that interlocks the bypass valve body with a rotational operation of the EGR valve body, wherein
• one of the first upstream passage and the second upstream passage is connected in series to the downstream passage via the junction in a same direction as a direction of the downstream passage,
• an other of the first upstream passage and the second upstream passage is connected to the downstream passage via the junction in a direction intersecting the direction of the downstream passage, and is defined as an other passage,
• the EGR valve body has a one side end provided on one side in a valve body lateral direction that is perpendicular to the EGR valve axis and is a direction toward which the EGR valve body is extended, and an other side end provided on an other side in the valve body lateral direction,
• in a state where the EGR valve body fully opens the downstream passage, the one side end or the other side end is located upstream with respect to a side edge that is an edge of an extended space and a closest edge to the downstream passage, the extended space is obtained by virtually extending the other passage toward a direction of the other passage,
• in a case where the one side end or the other side end is located upstream with respect to the side edge, as the EGR valve body rotates to the one side in the circumferential direction, an upstream side end located upstream with respect to the side edge, among the one side end and the other side end, is moved away from the other passage.