. Model engine construction, with practical instructions to artificers and amateurs. Fig. 20. top of the fire-box in the delivery-pipe, where itenters the boiler. The water enters at W, forcingup the valve V, and passing through the passage Pinto the boiler. Thus water passes in, but none getsout, as any backward flow would tend to force thevalve more firmly down upon its seat. Only enginesprovided with a force-pump require this valve. The THE BOILERS AND THEIR FITTINGS. 69 clack-box is a casting or a brass block. A passagemust be made right through the block, of the samesize as the delivery-p
. Model engine construction, with practical instructions to artificers and amateurs. Fig. 20. top of the fire-box in the delivery-pipe, where itenters the boiler. The water enters at W, forcingup the valve V, and passing through the passage Pinto the boiler. Thus water passes in, but none getsout, as any backward flow would tend to force thevalve more firmly down upon its seat. Only enginesprovided with a force-pump require this valve. The THE BOILERS AND THEIR FITTINGS. 69 clack-box is a casting or a brass block. A passagemust be made right through the block, of the samesize as the delivery-pipe W. From one end takeout a second cut from the bore, and stop short of theopposite end, so as to leave a collar between thewide and narrow parts of the bore; this collar formsthe seat for the valve V. To the lower end is screwed. Fig. 21. a pipe or coupling-screw, which forms a junctionwith the delivery-pipe from the pump. Into theupper end is screwed a circular brass plug C, whichacts as a stop for the clack V, and can be taken offwhen required to examine the interior. At thecentre of the clack-box, on one side, drill a horizontalpassage P (of the same bore as the delivery-pipe) 70 MODEL ENGINE CONSTRUCTION. which leads into the interior, but higher than thevalve V can rise; a short pipe connects the clack-boxwith the boiler. The valve V is made of brass, or isa casting: it consists of a disc, convex on one side,the other being the edge or face, which is conical edge of the disc must fit accurately ona corresponding seat formed by the collar mentioned
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmachinery, bookyear18
