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2. Piston valve (steam engine) - Wikipedia

   en.wikipedia.org/wiki/Piston_valve_(steam_engine)

   This entails controlling the admission and exhaust of steam to and from the cylinders with a valve linked to the motion of the piston. [3] For timing and dimensioning of slide or piston valves where the valve opens and closes the steam and exhaust ports, a consideration of the "lap" and "lead" is required.

3. Trofimoff valve - Wikipedia

   en.wikipedia.org/wiki/Trofimoff_valve

   The valve spindle is milled out to enable a better through-flow. The 4 piston rings on the valve heads are clearly visible. The valve on this locomotive has a diameter of 300mm. The Trofimoff valve (German: Trofimoff-Schieber) (also Trofimov, Troffimoff or Trofimof) is a springless pressure-compensation piston valve for steam locomotives.

4. Steam locomotive components - Wikipedia

   en.wikipedia.org/wiki/Steam_locomotive_components

   Controls the supply of steam to the cylinders. The valve gear, actuated by connection to the driving wheels, ensures that steam is delivered to the piston with precision. Types are slide valves, piston valves or poppet valves. [2] [3]: 62 Valve chest / Steam chest Valve chamber next to the cylinder (24) containing passageways to distribute ...

5. Gresley conjugated valve gear - Wikipedia

   en.wikipedia.org/wiki/Gresley_conjugated_valve_gear

   LNER Class V2 4771 Green Arrow.Note Gresley conjugated valve gear located ahead of the piston valves, driven from the valve spindles. The Gresley conjugated valve gear is a valve gear for steam locomotives designed by Sir Nigel Gresley, chief mechanical engineer of the LNER, assisted by Harold Holcroft.

6. Cutoff (steam engine) - Wikipedia

   en.wikipedia.org/wiki/Cutoff_(steam_engine)

   In a steam engine, cutoff is the point in the piston stroke at which the inlet valve is closed. On a steam locomotive, the cutoff is controlled by the reversing gear.. The point at which the inlet valve closes and stops the entry of steam into the cylinder from the boiler plays a crucial role in the control of a steam engine.

7. Vauclain compound - Wikipedia

   en.wikipedia.org/wiki/Vauclain_compound

   Steam flow in the valve and cylinders near the beginning of the stroke; note how the low-pressure steam flows through the center of the valve. The key to the Vauclain compound is its valve system. In essence, there is an extra system of valves, concentric with the usual middle steam passage in conventional single expansion piston valves. [3]