SD6909 : Bolton Steam Museum - Robey uniflow engine

taken 8 years ago, near to Bolton, Great Britain

Bolton Steam Museum - Robey uniflow engine
Bolton Steam Museum - Robey uniflow engine
I have a real soft spot for this 'modern' design of reciprocating steam engine. This design has the efficiency of a much more complicated triple expansion engine in a much smaller footprint. This is because wasteful condensation is reduced by ensuring the steam flows in one direction only from the hot cylinder heads to the cooler exhaust ports in the centre of the cylinder. Because of the temperature gradient and differential expansion the cylinders were bored in a barrel shape with a wider bore in the cool centre. At operating temperature the bore became parallel. Another special feature was the need to provide compression relief when the engine was running without a good vacuum produced by condensing the steam. Many uniflows had manually operated valves on the sides of the cylinder that opened auxiliary clearance spaces. This engine has automatic auxiliary exhaust valves. These operate all the time in the Museum because there is no condensing plant in operation. This engine was built in 1926 and supplied to the Baltic Sawmills, Ammanford. From 1938 it was used as a test engine in the laboratories of the Manchester College of Technology. It was removed by a local machinery merchant in 1947 and stored until acquired by the Northern Mill Engine Society in 1987. The cylinder is 13.5" bore by 16" stroke and it ran at 200 revolutions per minute on superheated steam at 200 pounds per square inch.
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SD6909, 116 images   (more nearby search)
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Date Taken
Sunday, 6 April, 2014   (more nearby)
Saturday, 16 May, 2020
Geographical Context
Historic sites and artefacts 
Place (from Tags)
Primary Subject of Photo
Subject Location
OSGB36: geotagged! SD 6999 0991 [10m precision]
WGS84: 53:35.0947N 2:27.2871W
Camera Location
OSGB36: geotagged! SD 6999 0991
View Direction
WEST (about 270 degrees)
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Other Tags
Steam Engine (Preserved)  Stationary Steam Engine  Bolton Steam Museum 

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Image Type (about): inside 
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