Detail of fuel pump face plate showing over-speed switch and mounting. The eccentric centrifugal rotor can be seen (brass coloured part). This unbalanced part rotates against a spring load that allows the thicker (proportionally heavier) section of the rotor to move outwards from the center as the rotational speed rises and push the release rod clear of a keyed section of the plunger shaft (part with disc shaped knob on left) thus operating a relay switch that shuts down the flow of steam to the turbine. 3D model Ray Matter
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