An air intake apparatus of an internal-combustion engine includes: an air intake passage communicating with a combustion chamber; an air intake flow control valve including a rotation shaft provided in the air intake passage and a valve body having a convex arc-shaped outer peripheral surface and opening and closing a main opening portion of the air intake passage, and controlling the intake air when the main opening portion is closed; a valve body storage portion provided in the air intake passage to have a concave arc shape corresponding to the valve body and storing the valve body when the main opening portion is opened; and a sub-opening portion provided between the outer peripheral surface and an inner surface of the valve body storage portion, allowing a portion of the intake air to pass therethrough and discharging the portion toward the intake air when the main opening portion is closed.

A valve device for a motor vehicle includes a housing, a flow channel located in the housing, and a flap arranged in the flow channel for closing the flow channel. The flap has regions in which a shaft penetrating the flap is fastened, and the shaft is rotatably supported in the housing. The flap has a spherical elevation at least on one side.

A valve arrangement, having a housing with a fluid line and a valve arranged in the fluid line which has a valve seat, a valve flap, and a valve opening, the valve flap being pivotable about a pivot axis between a closed position, in which the valve flap lies against the valve seat and closes the valve in fluid-tight fashion, and an open position, in which the valve flap opens up the valve opening. The valve flap, in the closed position, defining an X-Y plane of a coordinate system and the pivot axis being arranged with a spacing to the X-Y plane and defining the Y direction of the coordinate system. An alignment mechanism aligns the arrangement in which the valve flap is situated relative to the valve seat in the closed position to be is alignable and fixable at least in the X direction.

A valve device for a fuel cell arrangement in a motor vehicle includes: a housing; a flow channel extending in the housing; a flap configured to influence a flow cross-section in the flow channel; a shaft to which the flap is attached, the shaft being rotatably supported in the housing; a drive configured to drive the flap via the shaft; a valve seat arranged in the flow channel; and a seal including polytetrafluoroethylene (PTFE) arranged on a radially peripheral edge of the flap, the seal being configured to contact the valve seat with the flap in a closed position of the flap, so that the shaft passes through the flap at an angle. The seal includes a spring.

A supercharger includes a first introduction part having a first flow channel; a second introduction part having a second flow channel; a chamber into which the exhaust gas is introduced; an outlet part having one or a plurality of outlet flow channels; and a valve member housed in the chamber. The chamber has a first introduction port that leads to the first flow channel, a second introduction port that leads to the second flow channel, and one or a plurality of outlet ports that lead to the outlet flow channel. A main circulation space is secured. The valve member is capable of opening or closing, and allows two or more opened ports among the first introduction port, the second introduction port, and the outlet port to communicate with each other through the main circulation space.

This valve device is provided with: a body (10) that has at least one passage (11, 12) for passing a fluid and valve shaft holes (13, 14, 15); a valve shaft (20), which is passed through the valve shaft holes so as to be rotatable; and butterfly valves (30, 40), which are fixed on the valve shaft and are for opening and closing the passages (11, 12).

The butterfly valves (30, 40) are disposed so as to close the passages (11, 12) on a downstream side or an upstream side of the valve shaft holes (13, 14, 15) in a flow direction of the fluid. As a result, it is possible to prevent fluid leakage and achieve effective utilization of exhaust heat in an exhaust heat recovery system.

A bypass valve for an engine with turbocharging for use in a pipe section of a bypass. The bypass valve has a sealing device which comprises a flap. The flap is mounted to be doubly rotatable via a first axis of rotation and via a second axis of rotation.

A control system of at least one flap of a fluid duct of an intake system of an internal combustion engine, including: a swivel axis, at least one flap connected off-center to the swivel axis by which the at least one flap can be swiveled within the fluid duct between positions with different degrees of opening, a swivel lever connected to the swivel axis, the swivel lever pivoting the swivel axis, an elastic working return element connected directly or indirectly to the swivel lever and applying a force to the at least one flap to return the at least one flap toward a home position.

A double eccentric valve includes a valve seat having a seat surface, a valve element having an annular sealing surface, and a rotary shaft having an axis parallel to a radial direction of the valve element and offset from the center of a valve hole in a radial direction thereof. The sealing surface is positioned eccentrically from the axis toward an extending direction of an axis of the valve element. The valve element rotates about the axis of the rotary shaft between a fully-closed position in which the sealing surface is in surface contact with the seat surface and a fully-open position in which the sealing surface is furthest away from the seat surface. Simultaneously with start of rotation of the valve element from the fully-closed position, the sealing surface starts to separate from the seat surface and also move along rotation path about the axis of the rotary shaft.

A double eccentric valve includes a valve seat having a seat surface, a valve element having a sealing surface, a passage in which the valve seat and the valve element are arranged, and a rotary shaft which rotates the valve element attached to an attaching part of the rotary shaft. With respect to the valve element and the valve hole, a main axis of the rotary shaft is doubly eccentric in a passage direction and a direction perpendicular to the passage. By rotation about the main axis, the valve element moves between a fully closed position where the sealing surface contacts the seat surface and a fully open position where the sealing surface is furthest away from the seat surface. A second axis of the attaching part extends parallel to the main axis and eccentrically in a radial direction of the rotary shaft from the main axis.