The valve body is made of cast iron, while the valve guide is made of polished steel. The valve seat is constructed from a nickel-based alloy and coated with Stellite to enhance wear resistance. The exhaust valve mechanism includes a hydraulic piston for opening the valve and an air piston to assist in valve closing.

The exhaust valve opens inward to the cylinder, utilizing the gas pressure to prevent carbon buildup on the valve seat and dislodge any contaminants. Cooling water from the cylinder head circulates through the exhaust valve to ensure proper cooling during operation.

Operation:

The exhaust valve is actuated hydraulically by a cam-operated hydraulic piston. Hydraulic pressure is applied to open the valve, while pneumatic air pressure aids in closing the valve. The system includes a "virtual tappet," a small throttle valve that allows for controlled leakage of hydraulic oil when the exhaust valve closes. This feature prevents excessive hydraulic oil expansion, which could otherwise keep the valve open. A small throttle valve ("virtual tappet") manages oil leakage to prevent the valve from staying open due to thermal expansion of the hydraulic oil.

• Temporarily connect a 7-bar air line to the spring air connection on the exhaust valve.
• Lift the valve using a crane. The valve's weight should cause it to descend.
• Open the 7-bar air supply. The valve should close.
• An indicator (not described in detail) should rotate to confirm valve operation.
• Verify that the indicator moves up and down. This confirms that the valve spindle is moving freely and that the valve is functioning as intended.