Catalogue of the Mechanical Engineering Span Classsearchtermspan Classse
Catalogue of the Mechanical Engineering Span Classsearchtermspan Classse
Victoria And Albert Museum
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M. 3202. 633. Feed pump. Lent by Messrs. G. And J. Weir, Ltd. , 1907. This is a single cylinder non-rotative pump embodying the special features patented by Messrs. Gr. J. And W. Weir between 1881 and 1905. - The pump is vertical with the water cylinder below forming a base and the steam cylinder supported above it on two steel pillars. The valve gear is peculiar ; there is a steani-moved main or distributing valve working hori- zontally and controlling the admission and exhaust of the steam to... the cylinder ends, and an auxiliary valve, worked by a tappet gear, moving vertically on the back of the main valve and controlling its movements while also serving as a cut-off valve. The main valve is an ordinary slide valve, hollow, cylin- drical at its ends, but D-shaped at its middle, where ports are formed, and it slides on a cylindrical face which is provided with the usual cylinder ports. The cylindrical ends fit into small cylinders or (japs in the ends of the steam chest; the D-shaped part of the valve forms a flat face across which the auxiliary valve moves, and ports are formed in it leading to the ends of the main valve, and others admitting steam to the cylinder ports.
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