What is an exhaust valve?

Exhaust valve is an important part of car exhaust, this article will introduce what is exhaust valve.

This article contains the following:

• What is an exhaust valve

• Characteristics of exhaust valve

• How to distinguish between intake and exhaust valves

1.What is an exhaust valve

The valve is an important engine component. The role of the valve is to be responsible for inputting air into the engine and exhausting the exhaust gas after combustion.

2.Characteristics of exhaust valve

The shape of the valve head includes flat top, spherical top and horn top. Flat tops are generally used. The flat-top valve head is simple in structure, easy to manufacture, small in heat absorption area, small in mass, and can be used for both intake and exhaust valves. The spherical top valve is suitable for exhaust valves. It has high strength, low exhaust resistance, and good exhaust gas elimination effect, but it has a large heating area, large mass and inertia, and complicated processing. The horn type has a certain streamline shape, which can reduce the intake resistance, but its head has a large heating area and is only suitable for intake valves.

The valve cone angle is the angle of the valve sealing surface, which is generally 45 °, and some are 30 ° (CA1091 sex car 6102 engine). The valve of 30 ° is considered to have the same lift, the valve taper is small, the valve passing surface is large, and the intake resistance is small, but the valve head edge with a small taper is thin, the rigidity is small, and the sealing and thermal conductivity are poor. For the intake valve. The thickness of the valve edge is generally 1 ~ 3mm, in order to prevent the valve seat from being damaged or damaged by high temperature during operation. In order to reduce intake resistance and improve cylinder intake efficiency, most engine intake valves are larger than exhaust valves. The color of the used intake and exhaust valves is also different.

The valve rod is cylindrical and continuously reciprocates in the valve guide. Its surface must undergo heat treatment and polishing. The shape of the end of the valve rod depends on the fixed form of the valve spring. The commonly used structure is two halves of the locking plate to fix the spring seat. The end of the valve rod has a ring groove to install the locking plate, and some are fixed by a locking pin. There is a hole for installing the lock pin.

3.How to distinguish between intake and exhaust valves

The air valve is connected to the air filter, and the exhaust valve is connected to the exhaust tube. In general, the intake valve of the used engine is cleaner than the exhaust valve. The door moves upward to open the exhaust valve, the spark plug opens the exhaust valve after ignition, and the intake valve opens before the ignition.

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