Furness lubricators

I wonder if anyone can help? How did Furness lubricators work ie were they a form of displacement lubricator or did they work entirely by gravity or non of the above.

Regards

 

A quick Google found

Railways and Culture in Britain: The Epitome of Modernity - Google Books

It looks as if they were a rudimentary gravity feed with oil entering the cylinder during the exhaust stroke

Hope this helps,

Dom

 

In essence, just a conventional lubricator with tail trimmings. However, there was a non-return valve between the oilpot and the cylinder which was closed by steam and prevented them feeding whilst the regulator was open or otherwise pressurised. Supposedly the return stroke of the piston sucked the oil into the cylinder but it would only suck any oil deposited by the trimming. Next to useless if the non-return valve leaked even slightly.

 

My thanks to both of you

Regards