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Old Coal Fired Steam Boiler


Neal Lewis
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In the attached pic of an old, coal fired steam boiler, there's a weighted lever type device at the top. The purpose seems to be to automatically or manually release steam pressure from the boiler. I assume with coal fired equipment, it was difficult to control the temperature inside. Hence the need to literally blow off steam once in a while. Am I correct?

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tn_201132285818_Steam%20Bolier.jpg

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tn_201132285841_Steam%20Boiler2.jpg

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When the steam pressure rises to a set pressure, a diaphragm lifts the arm of the damper regulator, slacking the chain on the other end, allowing the draft damper to close.

I can't tell from the picture, but there should be a rod on the other end of the arm that simultaneously opens the "check draft" damper on the flue connector.

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