Valve setting: simple methods of setting the plain slide valve: Meyer cut-off. Corliss. and poppet types

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Hill publishing company, 1908 - History - 207 pages
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Page 199 - Referring to Fig. 199, when the engine crank pin is on either the top or bottom dead center, set the wrist plate exactly central; that is, when the piston is at the top or bottom of the stroke, the pins M M' should lie in a straight line between PC and P C'.
Page 25 - ... -053, and the port behind it later in the proportion of -008 to -033 (see Table III.) Whereas, if the cover on the exhausting side were removed entirely, the port before the piston would be shut and that behind it opened at the same time, and (see bottom of fifth double column, Table III.) the distance of the piston from the end of its stroke at that time would be -043 x 60 = 2-58 inches. An inspection of Table III.
Page 81 - Place the crank on one of its deadcenters, and turn the eccentric loosely on the shaft in the direction in which the engine is to run, until the steam valve nearest to the piston shows an opening or lead of g"j to J inch, according to size of engine, the smaller lead, of course, being adopted for small engines.
Page 191 - ... 168 degrees 18 minutes = 182 degrees 35 minutes. The piston is, therefore, on its return stroke and has traveled a distance equal to the radius of the crank times 1 — Cos. 2 degrees 35 minutes = R (1 — 0.999) = 0.018 in., an insignificant amount. Referring to the valve gear itself, the working edges of the valves and ports are shown by radial lines A, B, and C, Fig. 194, on the ends of the valves and valve chests, at the side of the cylinder opposite the wrist plate ; for each port there...
Page 128 - Admission Expansion Exhaust Compression Increase Inside Lap Is later Ceases sooner Occurs earlier Continues longer Is unchanged Engines at same point Increase Outside Lap Unchanged Begins as before Continues longer Occurs later Ceases earlie Begins sooner Continues longer Increase Travel Begins sooner Continues longer Begins later Ceases sooner Begins later Ceases later Begins later Ends sooner Increase Angular Advance Begins earlier Period unaltered Begins sooner Period the same Begins earlier Period...
Page 33 - FIG. 29. FIG. 30. valve-circle diameter intersects the crank circle, cuts the line of dead centers at a point N distant from the center 0 by an amount equal to the lap plus the lead of the valve. To prove that the line joining the points of admission and cut-off is tangent to the steam-lap circle, take the triangles...
Page 177 - Corliss engine the valves will hook up without releasing when the regulator is at its lowest working position, but with this type the valves are released alternately every stroke, no matter how low the regulator, unless it is in the safety position, when the valves would not pick up at all. SETTING THE VALVES Bearing these points in mind we may proceed to set the valves. The amounts of lap and lead and the positions of the cranks from the center lines given herewith are for engine cylinders of 36-,...
Page 34 - ... lap. The exhaust lead and the points of release and compression correspond respectively to the steam lead and the points of admission and cutoff, and are obtained on the exhaustvalve circle in the same manner as tlie corresponding points of the steam-valve circle.
Page 60 - Pig. 60. Turn the wrist plate to the other extreme and adjust the other dashpot rod in the same manner. Next with the governor in its lowest running position resting on the collar or pin provided for the purpose, turn the wrist plate so as to pick up the head-end steam valve and then turn it over until it nearly reaches the mark corresponding to its opposite position, and adjust the governor rod for the head-end valve so that the trip block E, Fig. 60, just engages the inner member of the hook K,...
Page 103 - ... the fixed point A. The vibration or horizontal movement of the trunnions is equal to the throw of the eccentric. In the slot of the link is the block B, from which are driven the two steam valves. The short rock shaft s on the frame is actuated by the outer arm a, which is connected by the steam rod with the block in the link. It carries on its inner end the two arms H and C which drive respectively the head-end and crank-end steam valves, through the medium of the two coupling rods h and c,...

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