Disclosed is a valve including a housing 30 having a passage 104 for exhaust gas, part of which defines an opening 36 for the valve member 20. The valve arrangement further includes a valve shaft 24 received in the valve opening, the valve shaft being driven by an actuator 50 to move the valve and hence open and close the valve. A pressure chamber 80 is provided in fluid communication with the passage via the valve opening. The pressure in the pressure chamber is adjustable to a pressure equal to or greater than a pressure in the passage. Pressurised air from the pressure chamber is used to blow any exhaust gas/soot particles away from the valve shaft, thereby preventing clogging of the passage and jamming of the EGR valve, and reducing the clearance size to the size needed by the valve.