steam-engine valve-gears

Steam-engines Valve-gears

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Caprotti valve-gear
Carlsund thread
Flodman's valve-gear
Gooch valve-gear
Hackworth's valve-gear
Klug's valve-gear
Stephenson's link motion
Stompf unidirectional

Replaces the old slide-valve
Caprotti valve-gear
This system, borrowed from the internal combustion engines, opens poppet valves controlled by cams on a camshaft.

Carlsunds thread
Carlsund thread
A pinion moves the outer casing axially, as a rack gear, and that movement turns the eccentric on the crankshaft and the engines rotation reverses.

Flodman valve-gear seems to be most used on Swedish steam engines
Flodman's valve-gear
Flodman valve-gear seems to be most used on Swedish steam engines

Gooch valve-gear is very similar to Stephenson link-motion
Gooch valve-gear
Gooch valve-gear is very similar to Stephenson link-motion.

 Changing the angle of the guide rails changes the engine's rotation.
Hackworth's valve-gear
The eccentric rod's suspension point moves to-and-fro in a straight line by means of a block sliding in a slotted guide.

Changing the pendulums suspension point
Klug's valve-gear
Changing the pendulums suspension point changes the engine's rotation.

Stephenson link motion
Stephenson's link motion
The slide valves are placed at the engines ends and/or between the cylinders and therefore the engine is longer than if it had had horizontal eccentric rods.

Stompf unidirectional
Stompf unidirectional
A cam on a camshaft, opens the steam inlet seat-valve a short time.