. American engineer and railroad journal . columns and as stop valvesbetween check valves and the boiler and between the watercolumn and the boiler. These valves are operated by means of a wrench on thesquare plug at the top in the hollow of the hand wheel. Thehand wheel is fast to the packing gland, which when adjustedis permanently secured by a lock nut. Upon turning the handwheel to the left the plug is lifted so that it may be easily THE LOVELL WINDOW OPERATING DEVICE. With the development of railroad shops into the large build-ings of the present time mechanical devices for opening andclo
. American engineer and railroad journal . columns and as stop valvesbetween check valves and the boiler and between the watercolumn and the boiler. These valves are operated by means of a wrench on thesquare plug at the top in the hollow of the hand wheel. Thehand wheel is fast to the packing gland, which when adjustedis permanently secured by a lock nut. Upon turning the handwheel to the left the plug is lifted so that it may be easily THE LOVELL WINDOW OPERATING DEVICE. With the development of railroad shops into the large build-ings of the present time mechanical devices for opening andclosing windows are not only desirable from a labor savingstandpoint but they are absolutely necessary in order to insurethe prompt closing of the windows in case of storm. This be-comes especially important in a building as large as 200 by 740ft., a size which has been attained in railroad shop construc-tion. The devices illustrated were developed to meet this need, andone of the engravings shows a section of 320 ft. of sash operated BOILER. V - Duplicate Method of Connecting Bordo Blow-Off Valve toStationary Boiler. turned at any time. When the lock nut is turned up to theunder face of the wheel a lifting cam, which couples the pack-ing gland to the plug, may be pulled out and the gland is thenfree to be removed in order to repack the plug. The accompanying part sectional engraving illustrates astraightway blow-off valve. This valve has a heavy shank, theoutside diameter of which is the outside diameter of the nextlarger size pipe than that of the nominal dimension of thevalve and discharge, thus insuring ample strength. When fit-ted to stationary boilers a desirable form of attachment Is to piciiact UTTIHe WHEEL ■ sou/me rod wpe«
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
