. Railway mechanical engineer . d. Attention may be drawn to the accessibilitj- of the valves;for their renewal it is only necessary to take off the valvechest cover and disconnect the valve spring, the spring caplock being a split spherical washer. Comparing this withthe procedure of taking out an ordinary piston valve, thegreat simplification due to the single beat valve will be ap-preciated. The driving parts and the ^^•al5chaert gear are the sameas those used on counterflow locomotives. On account ofits ^greater length the cylinder was moved forward 180 mm.( in.). The unaflow cylinder
. Railway mechanical engineer . d. Attention may be drawn to the accessibilitj- of the valves;for their renewal it is only necessary to take off the valvechest cover and disconnect the valve spring, the spring caplock being a split spherical washer. Comparing this withthe procedure of taking out an ordinary piston valve, thegreat simplification due to the single beat valve will be ap-preciated. The driving parts and the ^^•al5chaert gear are the sameas those used on counterflow locomotives. On account ofits ^greater length the cylinder was moved forward 180 mm.( in.). The unaflow cylinder is not heavier than thecorresponding counterflow cylinder, since the piston valvechest with its large exhaust chamber as well as tlie tailrod and its guide are omitted. This allows the piston rodof 95 mm. ( in.) diameter to be bored out to a diameterof 60 mm. ( in.), thus also saving weight. The forgedsteel piston heads, which are only slightly dished, hold be-tween them a supporting drum cast from a special. Fig. 6—The Unaflow Cylinder \iHh Poppet Valves Is Light and Tple soft mixture, while the cylinder is made of a hard (jualityof iron. The supporting drum is turned .smaller thanthe cylmder bore by mm. ( in.) on a length of 140mm. (5,5 in.) at its middle, which allowance to 5mm. ( in.) towards the ends. Each piston head car-ries three rings. The greater part of the total clearancevolume of 12 jK-r cent is taken up by a linear clearance of40 mm. ( in.) Ijetween the piston and cylinder head,and this also results in very small harmful surfaces. Thepressure oil feeds are arranged at the middle of the cylinder,where the temperature is lowest and little i) of car-bonizing exists. One feed is placed on toj) and one on eachside of 45 dcg. below the horizontal center line. Steam ConBumptioii of Unaflow Ix)comotive It is hopcfl that tests of these locomotives will soon l>cavailable and it is expected tiiat they wil
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
