OEM Weichai Deutz TD226 WP6 Diesel Engine Exhaust Valve 12159608

OEM Weichai Deutz Diesel Engine TD226 WP6 Exhaust Valve 12159608

Function of the Exhaust Valve

The function of the exhaust valve is to pass on the exhaust gases to the exhaust manifold from the combustion chamber. During the operation of internal combustion engine, exhaust valves are subjected to the axial stresses due to exhaust gas pressure, cyclic stresses due to return spring load, thermal stresses due to very high temperature inside the combustion chamber and inertia force arising on the account of valve assembly.

Our diesel engine’s exhaust valve is designed by selecting suitable fillet radius to reduce the stress concentration. Best material is choosed to increase the working life of exhaust valve.

Product Details

1, Material: 4Cr9Si2, 4Cr10Si2Mo, 21-4N, 23-8N, X60, X80, Inconel751, 21-4NWNb
2, Manufacturing Process: The raw material undergoes several steps before taking the final finished shape as the engine valve. Here are the machining processes that a valve goes through.

2.1 Cutting or Extrusion: From raw material to the form of bars through the process of cutting to length until the desired diameter of the bar is achieved.

2.2 Welding Process: The friction welding process is required to join the metal bars in scenarios where the valve head and stem are supposed to be made using different materials.

2.3 Upsetting Process: Upsetting compresses the billet between two dies, consequently reducing the height of a part while increasing its diameter.

2.4. Forging Process: The upset portion is immediately forwarded for the forging, during which the metal is heated and molded using compressive force. This process is the key point for refining grain structure and improving the mechanical properties of the valve.

2.5. Heat Treatment Process: This process involves three steps: quenching, washing, and tempering. Quenching reduces the crystallinity of metal, whereas tampering minimizes its brittleness.

2.6. Surface Treatment: This step involves shot blasting, which employs high-velocity steel abrasives. During this step, the surface of the valve is cleaned and further treated for secondary finishing procedures.

2.7. Surface Finishing: This is the concluding machining process of automotive valves, which is done to get the final desired shape of the valve. The surface finishing is done by hard chrome plating, which enhances the valve’s wear resistance and eventually increases its lifespan by providing a durable surface layer.