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Drawings for models, workshop tool and equipment, CAD Drawings, Excel Spreadsheets for calculations and data all valuable resources for the home machinist and model builder.
To download simply click on the image (or hyperlink if provided).
Small Pressure Gauge Syphon CAD Drawings
These are CAD drawings showing how to connect the syphon pipe to the boiler pressure gauge. These are for very small pressure gauges 3/4″ to 1″ diameter where the connecting pipes are very tiny and – finnicky.
The pipe fittings themselves are drawn in CAD at full size and presented in pdf A4 format at 4 X real size. These are small pictures of the CAD drawings:-
The first is for connections using standard pipe union fittings as freely available from model engineering suppliers. The second uses a custom-made pipe connection union of 3/32″ diameter. Sometimes these are supplied with the pressure gauge.
 Small Pressure Gauge Syphon – Standard Connections |
 Small Pressure Gauge Syphon – Custom Connections |
Banjo Fitting for 5/32″ Pipe
This Banjo Fitting is intended to be used with the pressure gauge connection fittings as shown above.
The CAD drawing is for a typical ∅5/32″ pipe Banjo fitting (as used for pressure gauge syphons) for small steam pressure gauges in the range of 3/4″ to 1″ diameter.
Dimensions are based upon measurement of a commercially supplied 1/4″ threaded Banjo fitting.
Pressure Gauge Syphon Banjo
Banjo Fitting for 5/32″ Pipe – Version 2 with Annulus
I received the following comment from JasonB on the Model Engineer Forum:-
“It is often better though a bit trickier to cut the cavity into the banjo. This means that the bolt is not weakened by the radial cut so less risk of snapping should it become a bit tight when you want to remove it.”
Jason also provided a nice 3D cutaway CAD sketch in his comment.
Accordingly I have prepared a Version 2 of the Banjo Fitting showing an annulus in the body instead of a grove in the stud:-
Pressure Gauge Syphon Banjo – V2 Annulus
As usual, you can download the A4 CAD version by clicking on the image above.
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