valves guides
The valve guide is a key component in internal combustion engines that directs valve movement and reduces friction. It is typically made of brass alloy, hardened steel, or wear-resistant steel with 55–60 HRC hardness and 700–1000 MPa tensile strength. Length ranges from 25–50 mm, and inner diameter from 5–12 mm. Oil grooves and graphite or nickel-chrome coatings provide proper lubrication and minimize wear. Operating temperature up to 300°C and valve linear speed up to 8 m/s are standard features.
Structurally, the valve guide consists of a cylindrical body, precise internal surface with 0.01 mm tolerance, and lubrication grooves. Installation is performed via press-fit or controlled heating for uniform fit with the cylinder head. Valve contact surfaces are corrosion-resistant and hardened, providing service life up to 100,000 km. This design reduces vibration, energy loss, and increases durability of gasoline and diesel engines.
