Unformatted text preview: ). 32.23 Valves
The valves used in internal combustion engines are
of the following three types ;
1. Poppet or mushroom valve ; 2. Sleeve valve ;
3. Rotary valve. Spark
inlet valve Out of these three valves, poppet valve, as shown closed
in Fig. 32.21, is very frequently used. It consists of head, Exhaust valve
face and stem. The head and face of the valve is sepa- closed
rated by a small margin, to aviod sharp edge of the valve
and also to provide provision for the regrinding of the
face. The face angle generally varies from 30° to 45°.
The lower part of the stem is provided with a groove in
which spring retainer lock is installed.
Since both the inlet and exhaust valves are subjected
to high temperatures of 1930°C to 2200°C during the
power stroke, therefore, it is necessary that the material
of the valves should withstand these temperatures. Thus Crankthe material of the valves must have good heat conduction, shaft
heat resistance, corrosion resistance, wear resistance and
shock resistance. It may be noted that the temperature at
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This note was uploaded on 09/30/2012 for the course MECHANICAL 403 taught by Professor A.thirumoorthy during the Spring '11 term at Anna University Chennai - Regional Office, Coimbatore.
- Spring '11