Description

We TOPU is a proffessional manfacturer engined in engine parts, intake valve and exhaust valve is the main parts for Toyota,Niaasn, Mitsubishi, Honda, Suzuki, Daihatsu, Isuzu, Mazda, Buick, Peugeot, Daewoo, Kia, Renault, Citroen,Volkswagen,Mercedes-Benz, BMW, Audi, Volvo, Opel, Hyundai, Skoka, Lada, Fiat, Alfa etc that we are dealing in.

3.The regular treatment.
 
Tuff trided/nitrided: valves are nitrided to increase the exhaustion strength, corrosion- and wear-resistant
Chrome-plated: valve stems with chromium to increase wear-/corrosion-resistant of stem
Stellite (seat hard faced): valves made by using deposit of stellite to get high hot hardness at seat
Bimetal: valve made by joining together two different valve materials by friction welding wherein high hot hardness alloy steel is used at head and stem made from a upright mechanical properties steel