. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . improvement in thelarge pump over the older styles, asidefrom its size, will be found in the matterof design, special attention being givento the facility in removing air valves andin getting at the diflferent parts of thepump to make repairs. An extra pair ofair inlet valves for the high pressurecylinder are provided in order to sup-ply ample opening for the entrance offree air. Referring to the illustrations, Fig. iis a vertical section through the pumpshowing the arrangement of
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . improvement in thelarge pump over the older styles, asidefrom its size, will be found in the matterof design, special attention being givento the facility in removing air valves andin getting at the diflferent parts of thepump to make repairs. An extra pair ofair inlet valves for the high pressurecylinder are provided in order to sup-ply ample opening for the entrance offree air. Referring to the illustrations, Fig. iis a vertical section through the pumpshowing the arrangement of design of the air and the steam pis-tons, the steam chests, the valves, thebushings, the caps. etc. From this fig-ure it will be seen that all air valves arealike, are 2 ins. in diameter, have a liftof ^1; of an inch, and are easily accessi-ble. Each valve is in a cage by itself. The steam chest caps. .=; 15. areattached to the pump by means of tapholts instead of being screwed in. asin the No. i and No. 2 pump. Thismakes their removal easy when repairsto^he slide valve or tappet rods are. S^. ^ Loeu. Sng. Fig. 2. Fig. 4. NEW YORK DUPLEX AIR PUMP, No. 5. necessary. The sizes of the various pipeconnections, etc., arc also shown inFig. 2 is a plan view of the pump December, 1904. RAILWAY AND LOCOMOTIVE ENGINEERING 55; looking down upon the top of the aircylinders. In this view the position ofboth the low pressure and the high pres-sure inlet valves is indicated, and it mayalso be seen that there are 4 air valvesfor each end of the pump, and that thehigh pressure air cylinder has an in-dependent air inlet. At the lower endof the air cylinders there are 4 airvalves corresponding to the upper 3 is a view of the rear elevation
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