A labeled schematic diagram of a typical single cylinder, simple expansion, double-acting high pressure horizontal steam engine. Power takeoff from the engine is by way of a belt. 1 - Piston 2 - Piston rod 3 - Crosshead bearing 4 - Connecting rod 5 - Crank 6 - Eccentric valve motion 7 - Flywheel 8 - Sliding valve 9 - Centrifugal governor.

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A labeled schematic diagram of a typical single cylinder, simple expansion, double-acting high pressure horizontal steam engine. Power takeoff from the engine is by way of a belt. 1 - Piston 2 - Piston rod 3 - Crosshead bearing 4 - Connecting rod 5 - Crank 6 - Eccentric valve motion 7 - Flywheel 8 - Sliding valve 9 - Centrifugal governor.