Rotary Valve

A rotary turbine bypass valve for an engine arrangement, the rotary turbine bypass valve comprising:

• a valve chamber positioned at a junction of an inlet port, an outlet port and a bypass port, the inlet port configured to fluidly communicate with a flow of exhaust gas from an engine, the outlet port configured to fluidly communicate with an inlet of a turbine, and the bypass port configured to fluidly communicate with an exhaust aftertreatment device;
• and
• a valve rotor supported for rotation, about a valve axis, within the valve chamber, the valve rotor comprising a first recess and a second recess, the first recess defining at least part of a primary flow passage, the second recess defining at least part of a secondary flow passage;
• wherein the valve rotor is rotatable about the valve axis between a first position in which the valve rotor substantially blocks exhaust gas flow through the bypass port and a second position in which the valve rotor permits exhaust gas flow through the bypass port;
• and
• wherein the secondary flow passage is configured to selectively permit fluid communication between the inlet port and the bypass port when the primary flow passage is at least partially blocked.