摘要:
A butterfly valve (80) includes a body (81) with a bore (82) through which exhaust gas may flow and a valve member (84) rotatably mounted within the bore (82) for restricting flow through the bore (82). A stop (90) extends into the bore (82) to limit movement of the valve member (84) and prevent the valve member (84) from rotating to a closed position. The stop (90) defines a restricted flow position at which the valve member (84) is positioned between an open position and the closed position. An internal combustion engine utilizing the butterfly valve (80) is also provided.
摘要:
A butterfly valve (12), preferably for a blow off circuit (9) of a gas turbine plant (1), is provided with: a supporting ring (18), which is provided with an inner perimeter edge (25) defining a fluid flow section (27), and with an annular seat (29) arranged along the inner perimeter edge (25); a disc (23), which is pivoted to the supporting ring (18) and is mobile between a valve closing position (12), wherein the disc (23) obstructs the fluid flow section (27), and a valve opening position (12), wherein the disc (23) does not obstruct the fluid passage section (27) allowing the flowing of the fluid; a sealing ring (22) partially housed in the annular seat (29) and adapted to abut against a peripheral edge (44) of the disc (23) when the disc (23) is in the valve closing position (12); the sealing ring (22) comprising an inner annular portion (34), which is contained in the annular seat (29), and a projecting annular portion (35), which projects radially from the annular seat (29) and is hollow.
摘要:
An exhaust gas purification system having a low-pressure EGR device for re-circulating a portion of exhaust gas to an air inlet tube on the upstream side of a compressor of the turbocharger, the exhaust gas being gas flowing on the downstream side of a turbine of a turbocharger. In the system, a technique for suppressing occurrence of vibration and noise when an internal combustion engine is stopped is provided. A first throttle valve (13) is provided on the downstream side of a compressor housing (15a) of the air inlet tube (9). When a stop request for the internal combustion engine (1) is issued, a second throttle valve (10) is opened first and then the first throttle valve (13) is closed.
摘要:
An air intake device for an internal combustion engine (1) having plural cylinders (12a, 12b, 12c and 12d) comprises an air intake passage (4) including a first air intake manifold (2) and a second air intake manifold (3), characterized in that the air intake device further comprises a partition (7) provided to divide the air intake passage into the first air intake manifold and the second air intake manifold; and a flow control mechanism (8) having a valve body (9) positioned to be one of: in a first position (P 1) at which the valve body closes air flow communication between the air intake passage and the cylinders; in a second position (P2) at which air flows into only the first air intake manifold; and in a third position (P3) at which air flows into both the first air intake manifold and the second air intake manifold.
摘要:
A valve plate is formed as a butterfly-type valve plate including a first and a second valve-plate half portions that extend in opposite directions to each other from a valve shaft. When the valve plate is at a first changeover position, the first valve-plate half portion is directed to the downstream side of a first intake passage from the valve shaft and the second valve-plate half portion is directed to the upstream side of the first intake passage from the valve shaft so that a first plate face of the valve plate forms a part of the first intake passage. When the valve plate is at a second changeover position, the first valve-plate half portion is directed to the downstream side of a second intake passage from the valve shaft and the second valve-plate half portion is directed to the upstream side of the second intake passage from the valve shaft so that a second plate face of the valve plate forms a part of the second intake passage. Accordingly, the power needed for changing over the valve plate and for keeping a predetermined changeover position can be reduced significantly.