Hatfield Merryweather pump – by Brian Stephens

We have recently been contacted by Brian Stephens of South Wales who is restoring a Hatfield Merryweather trailer pump. He tells me it has a Meadows engine in it, and judging by the photos, he is well on the way with a very comprehensive restoration.

Anyway, the reason for him contacting me was to ask advice on how to operate the thing. Now all our pumps are centrifugal, but three-cylinder positive pumps are quite a different beast if you don’t know what you are doing, with the capability of bursting a hose or blowing the cover off a cylinder if the water flow is abruptly stopped. However, it shouldn’t happen if there is a pressure relief bypass valve. Also, I gather the unit has a clutch, which means you can start the engine with the pump disengaged.

So if any of you have any manuals for the Hatfield pump, or any experience with positive pumps, I am sure Brain would love to hear from you. Also, do you know what the control is in the top centre between the top two cylinders? Contact info@nfs-afs.org uk and we will pass it on to Brian.

You can see some of the Merryweather products here.

About lowdhamstation

I am a director of a small (and very technical) business, a committed Christian, a Reader (and preacher) in my local village church, husband to my dear Frances, am interested in heritage railways, and heritage fire engines. I currently run a group that displays wartime and early post-war fire engines at 1940s re-enacting events and steam engine rallies. O yes, and vintage cars and motorbikes, and we live in a Victorian railway station.
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