Beresford-Stork Pumps in Thousands
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AMONGST the most successful of the light trailer pumps built for A.F.S. and other home-defence work are those manufactured by James Beresford and Son, Ltd., Cato Street Works, Birmingham, 7, which company claims to be the first to supply models with fourcylindered engines, water-cooled sumps and exhaust ejector priming. Their success is shown by the fact that thousands are giving good service.
Two types, known as BeresfordStork, are produced—the large and the _light units—of which we illustrate an example of the latter. It is powered by an Austin Eight engine, whilst the large model has a Ford 30 h.p. V8 unit.
The priming of the pump in a unit, which it is essential should be brought into service in the shortest possible time, is of great importance. Tests were conducted with the light model, equipped with the engine-exhaust ' vacuum primer, under the supervision of the National Physical Laboratory, and covering 500 consecutive primes at a 24-ft. suction lift Not even the pump gland was touched and there was no variation in priming times.
No lubrication of mechanism or grinding are necessary, and an important feature is the two-way control valve. This has a taper plug that screws itself home when on ejector exhaust, thus preventing gas leakage and producing especially rapid priming.
The pump has a 3 per cent, nickelsteel shaft, resistant both to corrosion and gland wear, whilst it is supported in bearings on each side of the impeller: they are of the Oilite self lubricating type, carried on a threearmed spider in the suction inlet, and a double row self-aligning external ball hearing mounted in the extension bracket and taking axial and radial load. The pump shaft is coupled to the engine flywheel by a Hardy Spicer fabric-type joint.