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
