Valves are mechanically opened and closed to admit or exhaust the gases as needed. The valves are located in the head casting of the engine. The point at which the valve seals against the heat is called the valve seat. Four-stroke diesel engines have intake valves as well as exhaust valves. We offer a wide range of high quality diesel engine valves suitable for the below listed engine types. Please contact us if you have any questions regarding the valves we offer.