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Valve for Toyota Avensis 2.0 D - Repl...
<p>The valve is composed of a valve head and a stem. The temperature of the valve head is very high (570~670K for intake valves and 1050~1200K for exhaust valves), and it also bears the pressure of the gas, the force of the valve spring and the inertia force of the transmission components. Its lubrication and cooling conditions are poor, and the valve must have certain strength, rigidity, heat resistance and wear resistance. The intake valve is generally made of alloy steel (chrome steel, nickel-chromium steel), and the exhaust valve is made of heat-resistant alloy (silicon-chromium steel). Sometimes, in order to save heat-resistant alloy, the exhaust valve head is made of heat-resistant alloy, and the stem is made of chrome steel, and then the two are welded together.</p>
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