Valves

Valves are used to regulate or control the flow (fully open, fully closed or partially open).

Major types are
1. Gate valves
2. Globe valves
3. Ball valves
4. Butterfly valves




Fig 1. Gate Valve







Fig. 2 Globe Vlave



Fig 3. Ball Valve


Fig 4. Butterfly valve

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Diesel Engines

Diesel engines are used because they can produce more power. But they also pollute the air more than gasoline engines.
Major systems are

1. Air intake system
2. Fuel system
3. Lubrication system
4. Cooling system
5. Starting system

Gas Turbines

Gas turbines are widely used in these days.

Three main parts in a gas turbine are
1. Compressor
2. Combustor
3. Turbine

The compressor will suck air and increase pressure and temperature of the air.
The combustor is a combustion chamber to burn air and fuel in a gas turbine.
The turbine will get power and rotate the shaft. The rotating shaft will connect a generator to produce electricity in a power plant.