The primary function of valves is to admit air into the engine and expel exhaust gases after combustion. The roundness of the valve seat (typically 45° or 30°) and the concentricity with the valve stem (≤0.03 mm) are critical factors in valve quality control, directly affecting the engine’s sealing performance, heat dissipation efficiency, and service life.
Valve
Contour Measuring Instrument：
Cone surface height measurement.
Roundness Measuring Instrument：
Cone surface, peak area, distance from cone surface to valve stem, cone angle, concentricity, cylindricity measurement.
Roughness Measuring Instrument：
Valve stem roughness measurement.
