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This is an informative view of the superheater and its elements; the end of the regulator rod is clearly visible in the top aperture. When more regulator is applied, saturated (wet) steam from the main boiler at up to 250psi is sent down the superheater elements and back towards the fire. Here the steam is 'superheated' so that it contains even more expansive energy, and is completely dry, so should not condense in the valves or cylinders. Each element takes the steam on an out and back journey along the flue (hence the two ends to each element), and then it returns to the header where it will be forced via to the two aperatures at either side, down through steam pipes into the valves and cylinders.
Didcot Aug10(1)029_edited.jpg