1.Hongfa manufacture SINCE 1990, The biggest engine valve factory located in northern China. Specialize in most types engine valves, suitable for Marine, Generator,Mobile machinery shop, Sinotruk, etc.

2. Raw Materials 

Normal material:INLET VALVE IS SUH1(40Cr); EXHAUST VALVE IS SUH3(4Cr9Si2). 

Best material:INLET VALVE IS SUH(4Cr9Si2) ; EXHAUST VALVE IS SUH35(21-4N).
 

3.The regular surface 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