This is done by increasing the width of the valve seat. However, this can result in negative effect on effect on flow coefficients, and the seat contact widths are usually kept to a minimum due to this reason.
Another possible method is the water cooling of valve seats, which is widely used in larger engines and piston aero engines. This technique is being used by manufacturers for many years. They do it by simply connecting a machined recess to the water jacket using one or multiple grillings. This will have limited effect unless there is a pressure differential between the exit and inlet grillings to the valve seat to encourage water flow around the seat.
Valve distortion and tensile stresses occur in the valve rim during the contraction of cooled seat surface on the valve. These cyclic tensile stresses can result in fatigue failure in the form of cracking and chipping of the valve.
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