. American engineer and railroad journal . aulic pumps Or ac-cumulators are required and costly hydraulic valves and highpressure water mains are done away with. The hydraulic pres-sure of 1,500 libs, per sq. in. is uniform and the machine is freefrom shocks caused by the dropping of the accumulator whenthe pump and accumulator system is used. The arrangement for operating the machine is clearly shownin the drawing. By means of the lever which controls thethree-way valve C, air at 125 lbs. pressure per sq. in. is ad-mitted to what is known asl the large differential. This con-sists of the smal
. American engineer and railroad journal . aulic pumps Or ac-cumulators are required and costly hydraulic valves and highpressure water mains are done away with. The hydraulic pres-sure of 1,500 libs, per sq. in. is uniform and the machine is freefrom shocks caused by the dropping of the accumulator whenthe pump and accumulator system is used. The arrangement for operating the machine is clearly shownin the drawing. By means of the lever which controls thethree-way valve C, air at 125 lbs. pressure per sq. in. is ad-mitted to what is known asl the large differential. This con-sists of the small 8% by 30 in. water cylinder F, and the large31-in. air cylinder. The ram which compresses the water inthe upper part of the smaller cylinder is connected to the samerod as the piston in the air cylinder. As compressed air is used in practically all boiler and bridgeshops, hydraulic machinery operated by this system canreadily be added to the equipment without installing an expen-sive hydraulic system. A substantial saving in the cost of. 125 Ibi. Floor lloe HYDRAULIC RIVETER OPERATED IIV A NEW SYSTEM. operation is also claimed. The pressure from the larger dif-ferential operates both the riveter and the plate closer, theplate closer automatically working in advance of theriveter. By means of the three-way valve E the plate closercan be cut out when not required. The small differential Bfurnishes pressure to push back the riveter and plate pressure acts on this differential at all times but if neces-sary can be cut off by means of the valve I). This system which is being patented by Mr. Win. H. Engineer, .Media. Pa., has been in use for sometime operating several machines with excellent results. The Cost of Gas vs. Sham Power. Comparisons betweenoperating costs of gas and steam power stations are not oftenmade on a fair basis, but the Engineering Imvir records acomparison of two stations on the same system, operated bythe same company, and so situated
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
