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Trofimoff valve
The Trofimoff valve ((ドイツ語:Trofimoff-Schieber)) (also ''Trofimov'', ''Troffimoff'' or ''Trofimof'') is a springless pressure-compensation piston valve for steam locomotives.
==Overview==
The function of the valve is to improve efficiency when running light, with the regulator closed, such as when descending hills. The valve consists of the usual parts of a piston valve: two valve pistons with sealing rings, carried on a valve spindle driven by the valve gear. The difference with a Trofimoff valve is that the piston heads are free to slide on the spindle. When steam pressure is applied, under normal operating conditions, steam is admitted to the centre of the valve chest. This forces the valve heads apart against end stops on the spindle and into their normal working position. The valvegear works as usual.
When the regulator is closed, there is no pressure to force the piston heads apart. The pistons remain stationary in the centre of their travel, uncovering the valve ports. There is now a clear path through the valves and the working pistons, allowing free running for the coasting locomotive.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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