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Qu'est-ce (qui) est Gab valve gear - définition
Gab valve gear
![Blists Hill]]. The red handwheel is the steam stop valve, the lever in front of the engine driver disengages the valve gear gab.](https://commons.wikimedia.org/wiki/Special:FilePath/Blists Hill Operating the pit winding engine.JPG?width=200 "Blists Hill]]. The red handwheel is the steam stop valve, the lever in front of the engine driver disengages the valve gear gab.")
.jpg?width=200 "Loose eccentric reversing gear, with a rudimentary gab")
Gab valve gear was an early form of valve gear used on steam engines. Its simplest form allowed an engine to be stopped and started.
valve gear
![View of [[Henschel & Son]] conjugated valve gear mechanism used on [[Victorian Railways H class]] locomotive, driven from the outside Walschaerts valve gear](https://commons.wikimedia.org/wiki/Special:FilePath/H220motion3.jpg?width=200 "View of [[Henschel & Son]] conjugated valve gear mechanism used on [[Victorian Railways H class]] locomotive, driven from the outside Walschaerts valve gear")
.jpg?width=200 "Stephenson's Valve gear. Two eccentrics at nearly 180-degree phase difference work cranks from the main drive shaft. Either can be selected to work the valve slide by shifting the slotted expansion link.")
MECHANISM THAT OPERATES THE INLET AND EXHAUST VALVES OF A STEAM ENGINE
Eccentric-and-rod mechanism; Eccentric-And-Rod Mechanism; Slip-eccentric valve gear; Isaacson's patent valve gear; Young valve gear; Radial valvegear; Radial valve gear
¦ noun the mechanism that controls the opening and closing of the cylinder valves in a steam engine or internal-combustion engine.
Valve gear
MECHANISM THAT OPERATES THE INLET AND EXHAUST VALVES OF A STEAM ENGINE
Eccentric-and-rod mechanism; Eccentric-And-Rod Mechanism; Slip-eccentric valve gear; Isaacson's patent valve gear; Young valve gear; Radial valvegear; Radial valve gear
The valve gear of a steam engine is the mechanism that operates the inlet and exhaust valves to admit steam into the cylinder and allow exhaust steam to escape, respectively, at the correct points in the cycle. It can also serve as a reversing gear.
