Fig. 3293.
Fig. 3294.
Fig. 3295.
Referring now to the simplest form of high pressure stationary steam engine, such as represented in [Figs. 3293], [3294], and [3295], its valve gear or valve motion consists of the eccentric and its strap, the eccentric rod, the valve rod guide a, the valve rod or valve spindle, and the valve v, these parts controlling the admission of steam to one side of the piston, and the exhaust from the other.
The piston, piston rod, cross head, connecting rod, crank, crank shaft, main shaft or driving shaft, and the fly wheel constitute the driving or power-transmitting mechanism.
The steam side of the piston is that against which the steam is pressing, as side s in [Fig. 3295]. The exhaust side, e, of the piston is that on which the steam is passing out or exhausting.