September 10, 2016

The Truth about D-Valve Slide Wear

Written by Jeff Frost Myth: D-valves/slide valves will “wear in” as they wear Answer: No. They will wear convex and the valve seats will wear convex. When the slide valves and the valve seats are new, they are flat and create a steam tight seal so steam can’t leak into the piston chamber or out the exhaust. The steam pressure in the steam chest pushes the valve onto the seat. As the