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Simplex Locomotive Boiler Feed Pump

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sbwhart:
This is the boiler feed pump I've been making for the Simplex Loco I'm finishing off. Its to the improved super simplex design that has larger feed galeries and a different arrangment of return valves making it more compact, it's a double acting pump.

Drilling the and tapping the body



Measuring the height of the ball valve



Setting the ball down onto the seating by giving it a sharp square biff.



The parts off the pump exploded out.



I still need to fix the pump into the loco frame.

This is the eccentric where it has to be linked to.



Stand by for updates

Stew

Alan Haisley:
Stew,

If you needed to mount the pump other than vertical, would it be enough to simply add springs to the balls or would more need to be done  :-\

Alan

sbwhart:
Hi Alan

Regardless which way the pump is mounted springs are not required its the flow of the water (pressure) that closes the balls onto the seats and cuts of the flow, when the piston changes direction it sucks lifting the ball off the seat and allowing the water to flow round it, to fill the chamber ready for the next power stroke. i can send you a copy of the drawings so you can see how it works.

Thanks for you're interest.

Stew

Alan Haisley:
I hadn't considered the speed that the piston would be moving the fluid. I've been thinking about making a small vacuum/pressure pump and had just assumed that the check valves would need to be spring loaded. In hindsight building without springs has two advantages: simplicity and not scratching the balls with the spring wire (I assume that not all purchased steel balls are hardened the same).

Alan

sbwhart:
A bit of an update more or less got the pump completed just needs the packing added i'll do that when I do the final assembly.

I had to make a new streacher to mount eh pump in the frame.

Here it is with the pump fitted.



Stew

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