Valve seat inserts act as seating and sealing surfaces with preventing the, The valve escape of gases during compression and power strokes. They must possess high fatigue and impact resistance owing to the constant hammering they undergo during valve closure. Only the best valve seat Producers based in India pass the stringent quality requirements of autograce brand valve seat inserts exported by garima global. Material popular material grades include pl12mv, J3 / sae j610b, J100, J120, Stellite, Valmet, Welltite etc. And must be chosen judiciously based on the application. Cast iron most cost effective but with severe limitations in performance. Steel strike a good balance between economy and performance. Superalloys most expensive, Chosen for high performance, Extreme temperature and very heavy duty applications.