The Steamboating Forum

Hi,

the assembled and well tested pump. It has 7 mm stroke but i will reduce it to 6 mm, so is a clearance in the dead centres of 0,5 mm. The lever is in upper dead center position (delivery stroke).


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Dietrich

Hi,

the bearings of the lever axle were fitted with PTFE-coated bushings, as the original axle pressed into the housing was replaced with one with a diameter of 6 mm due to its 1/4" diameter, which is now firmly clamped in the lever.


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Dietrich

Hi, the work is done, all parts are finished. As is so often the case, mechanical engineering begins with the construction of fixtures and fittings to enable the necessary work to be carried out. Here are the mounting pins for the lever. This allows the lever's radii to be milled very conveniently u...

Hi, to test the pump's proper function, I installed it and measured the flow rate using a measuring cup. STUART_MembPu027KL.jpg The maximum stroke of 7 mm was achieved; the pump's stroke in the steam engine system will be 6 mm. During the test, 30 strokes delivered a volume of 475 cm³. STUART_MembPu...

Hi, I removed the riveted diaphragm rod. STUART_MembPu025kl.jpg To ensure the full stroke (7 mm (9/32")), I flattened the head of the mounting bolt and reduced its diameter so that it is only slightly larger than the original rivet head. STUART_MembPu030kl.jpg STUART_MembPu031kl.jpg ---- Dietrich

Hi,

some more pictures.
The oil seal is inserted into the seat in the housing.


View from the membrane side


View from the drive side


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Dietrich

Hi, i've made some progress. The hand lever and the pump diaphragm drive were removed from the shaft for manual pump operation, and the shaft was then reinstalled. STUART_MembPu013kl.jpg STUART_MembPu022kl.jpg The diaphragm drive rod will be made from 10 mm round stock. This rod will be guided by a ...

Hi Bart, thank you for the explanation regarding the 12 inches. I used the smallest heat exchanger I could find. Because the exhaust steam is completely condensed and the condensate is then pumped out, no back pressure is expected. At least that wasn't the case with the condenser of my large steam e...

Hi Scott, thanks for your question, but unfortunately I can't make sense of the specification "12 inches of vacuum" since I live in the "metric empire", where atmospheric pressure is 1 bar and a complete vacuum is 0 bar. For me, inches are a unit of length. I'm hoping to achieve ...

Hi, STUART_MembPu003.jpg the tappet was guided in a combined seal/guide, which will be removed and replaced by a suitable guide bushing for the new diaphragm tappet. The lever for manual operation will be superfluous in the future and will be redesigned into a simple plug (the prongs will be removed...