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Duplex steam feed pump

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John Rutzen	03/11/2022 20:24:28
411 forum posts 22 photos	They are in volume 103, there is the complete volume of ebay for £12 including post at the moment.
Paul Lousick	04/11/2022 02:32:42
2276 forum posts 801 photos	My Ruston Proctor traction engine from LSM came with a steam operated Moore Pump which I stopped building because I realized that it would not work. (also reported by other builders). It is a single cylinder pump with a slide valve, directly coupled to the piston rod. Slide valves on engines work OK because the inertia in the flywheel carries the valve past the mid point where both steam ports are closed but on a slow moving pump the valve can stop moving, covering both supply ports. Duplex pumps like a Worthington have 2 cylinders in which the piston on the RH side operated the slide valve on the LH side and when it has finished its stroke the opposite happens. A hydraulically operated shuttle valve is a similar design. I am in the process of adding a shuttle/change over valve to the pump which I already have.
John Rutzen	04/11/2022 08:13:53
411 forum posts 22 photos	That's very interesting to know Paul. There are many drawings out there for bits that don't work, it's very frustrating at times.
Martin Johnson 1	04/11/2022 12:58:58
320 forum posts 1 photos	Posted by Clive Brown 1 on 02/11/2022 14:38:23: Here's a Stuart pump running on air. It's a bitfast, i would hope it would slow down if actually pumping against boiler pressure. It will slow down under load, in fact it should run quite nicely on just a few pounds of air. The clever bit is getting it to run on (usually soaking wet) steam. A couple of turns round the smokebox is unlikely to give enough superheat. Martin

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