1 1/2" Allens Governor with full sized sectional drawing

1 1/2" Allens Governor with full sized sectional drawing

By this governor the supply of steam is regulated by the frictional resistance of a paddle immersed in fluid, and driven by the engine. It consists of a standard carrying a shaft, which is driven by a pulley and has a six-armed paddle-wheel keyed to it. The wheel is enclosed in a casing attached to a shaft on the same centre line as the driven shaft. The interior of the casing is provided with ribs, which just clear the paddles, and is partly filled with oil, so that by the rotation of the paddles the fluid exerts a considerable force, tending to rotate the casing by a kind of fluid coupling. The motion of the casing is, however, resisted by an adjustable weight hung by a chain from a suitable cam on its shaft, so that the action of the weight increases as the casing is carried round. On the shaft of the casing is a pinion gearing into a segment on the lever of the throttle valve, which is of the equilibrium piston type and contained in the base of the governor.