uniform tissue high collapsing strenght high oil contain good abrasion resistance floating press and inhalation feed   Valve guide made of powder metallurgy in our company has a 120mm long and the ratio of the length and diameter is 6:1. Because the product adopts...

It not only has original Valve Seat's function, but also can force Valve rotator around its own axis     We have develop a new technology to shape valve spring retainer by low carbon alloy steel extrusion ,after its surface carburized treatment ,it can improve...