RV 516 centerless valve refacer is, thanks to the technical solutions adopted, one of the fastest and most accurate machine now available on the market. The centerless grinding system, with the rotation of the valve on its stem, grants a perfect concentricity between head and stem (within 0,01 mm) and handles a large range of valve stem diameters from 4 up to 16 mm, without need of changing any collets or chucks.
The drive system of valves is given by three rollers, the upper of which is canted in order to feed valve against an adjustable precision end stop: this offers an accurately valve controls length on every valve and avoids to manually feed valve into or away from grinding wheel during refacing. Moreover, the stroking handle has the dual purpose to move the valve back and forth over the grinding wheel and also lifts the rotation drive
roller away from the valve stem to allow thevalve change without switch off the driving motor.
The machine is also equipped with a diamond dresser with micrometer set and an efficient removable coolant system with pump and settling tank.
As options are also available a secondary grinding wheel application (ASM516) for stem butt and chamfering griding without using the main wheel and the variable valve speed device (VGV516) to adjust surface speed for different diameter valves for best surface finish for a wide
range of valve head diameters.