... manfacturer engined in engine parts, intake valve and exhaust valve is the main parts for Toyota,Niaasn, Mitsubishi, Honda, Suzuki, Daihatsu, ... faced): valves made by using deposit of stellite to get high hot hardness at seatBimetal: valve made by joining together two ... valve materials by friction welding wherein high hot hardness alloy steel is used at head and stem made from a upright mechanical ...