Advertisement
The first area is the intake and exhaust valves.
Types
One piece
A one piece valve is forged from on single type of material.
Two piece
A two piece valve is manufactured from two different materials. The valve face material may
have better heat ratings, while the valve stem material would have better wear characteristics.
Projection Welded Tip
For a complete valve manufactured in stainless steel for example, a small piece of is welded on
the stem end. Then this tip is quenched to improve its mechanical properties.
This helps to tolerate high impact and wear resistance of the stem end.
Valve hard facing
Changes or modifies wear and heat characteristics of the valve face.
Valve stem surface treatments
Changes or modifies wear characteristics of the valve stem.
Valve head design
Interference interface angle
Valve seat angle and the valve seat angle are slightly different. Prevents carbon build-up
between sealing surfaces.
Face can be resurfaced
Valve dynamics
Most valves rotate slightly each time they open and close.
Rotation improves temperature distribution
Rotation helps clean valve interface.
Rotation can be enhanced through use of valve rotators
Advertisement
