Valve Seat Inserts
The main role of valve seats is to provide sealing with the valves. Controls the exhaust gas outlet for the exhaust valves and the fuel inlet to the combustion chamber. It is mounted on the head cover. There are also some seats in the formed to cover the surface itself. During engine overhauls, the necessary attention should be paid to the correct alignment of the valve, valve guide, and seat insert. Misalignment can cause alternating bending stresses in the valve stem, valve seat, valve tip, and valve guide surfaces. Engine power decreases, some wear, cracks, burns and eventually failures can occur. The seat ring must be mounted to cover with adequate clearance in accordance with regulations. These factors affect the performance of the valve directly. You need careful attention when machining the seat surface.

Valve seat inserts represent a very important component of the valve train in internal combustion engines, as they are the interface between the valve and the cylinder head. The valve inserts and the valve seat serve together to seal the combustion chamber that regulates the inlet and exhaust gases. The valve seat insert prevents direct contact of the valve with the cylinder head and absorbs some of the combustion heat that is transferred to the valve by passing it to the cylinder head. The selection of materials for valve seat inserts is vital to withstand millions of cycles in high temperatures, stresses and gases and corrosive compounds. There is a range of material qualities for various engine applications.

Valve seat materials are designed using thermodynamic models and advanced metallurgical and physical testing to ensure that complex alloys, compounds, additives, and processing provide components that are thermally stable at the valve seat exhaust temperature. Sintered materials are inherently porous. We use a technique known as infiltration to fill the porous spaces in the valve seat with copper. Copper improves the thermal properties of the component and improves the machinability of the material. We have added a wear resistant phase to our valve seat manufacturing process to produce a compound and improve wear resistance. The wear resistant phase is highly alloyed, allowing the total cost of the component to be reduced using double layer technology. This process allows the component to be manufactured using a wear resistant alloy for work surfaces and a simple iron material that is used as a backing on the non-functional part of the component.

Valve seat inserts must meet certain characteristics, such as compressive strength, hot hardness, thermal expansion, high temperature stability, thermal conductivity, corrosion, abrasion, adhesive wear resistance, and machinability.

The precision valve seats are manufactured for different applications, such as automotive, locomotive, marine, high performance, resulting in the best quality according to customer requirements that meet their needs.

Seat rings can eventually wear out and fall off, and these used rings can be replaced with new ones. However, this requires a lot of attention, so it is not preferred, on the contrary, a thick valve is used.

Material For Valve Seat Inserts
Sr. No. Material Name C Si Mn P S Cr Mo Ni Cu Fe Co V T W
1 PL12MN(OEM) 1.5% to 2.20% 0.8% - 1.0% 0.08% to 1.0 % 0.04 % Max 0.07 % Max 12% - 14 % 2% -2.5% 0.5 % Max
2 J3 Stellite : SAE J610b 0.02% 0.02% 0.01% 0.29% 0.03% 0.03% 0.13%
3 J 96 0.02% 1.00% Max 0.29% Balance 8.00% Max 0.15%
4 J 100 0.02% 1.00% Max 0.29% Balance 8.00% Max 0.10% 0.15%
5 J 120 1.20% -1.40% 0.030%-0.60% 0.30%-0.60% 3.75%-4.25% 6.00% - 7.00% 1.00% Max 0.25% Max Balance 5.00%-6.00%
6 J 120 V 1.20.%-150% 0.030%-0.60% 0.30%-0.60% 0.30% Max 0.12% Max 3.75%-4.25% 6.00% - 7.00% 1.00% Max Balance 1.30%-1.60% 5.00%-6.00%
7 J 125 1.45% Max 2.10% Max 0.00% 0.20% 0.01% Balance
8 STELLITE 2.0 %-2.7% 1% 29.0% - 33.00% 0.03% 41.30%
9 VALMET 1.5%-2.0% 1.5% - 2.0 % 13.5% - 15.00% 0.35%-0.42.0%
10 WELLTITE 2.0%-2.4% 1.5% - 1.9 % 11.0% - 13.0% 5.0%.7.0% 38.0% -42.0% 0.4%-0.6%
11 WELL-TITE MATERIAL 1.70%-2.10% 1.75 %- 2.25% 0.80%-1.20% 0.03% Max 10.0% - 12.0% 40.0% -42.0% 0.50% Max Balance 1.00% Max 0.9%-1.10% 0.20% Max
12 MAR-TITE MATERIAL 1.20%-1.60% 0.50% - 1.00% 0.04%-0.60% 0.05% Max 0.05% Max 18.0% - 21.0% 0.05% Max 1.80%-2.50% 0.03% Max Balance
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