

M \ HIM: II;A\VIN 



DKSHIN 



EXERCISE 70: Conical Due Vahet.DrKw, half size, th< flans 

 and elevations shown in figs. 67 and 68. In fig. 66 the valve is 

 shown open in the elevation. an. I in tin- plan it is removed altogether 

 in order to show the seat \\itli its <;uiiU> bridge. 



K - -S 



Pla. n of Se a2. 





Simple Slide Valve. The form of valve shown in t 

 often called the locomotive slide valve, is very largely use<l in all 

 classes of steam-engines for distributing the steam in tin- 

 steam cylinders. The valve is shown separately at (rf), (e), 

 and (/), while at (a), (6), and (c) is shown its conn<-< 'ion \\itli 

 the steam cylinder. 



It will be observed that the valve itself is in tho shape of 

 a box with one side open, the edges of the open side l>< -ini: 

 flanged. \VhMi the valv<- is in its middle position, as shown 

 at (a), two of these flanged edges completely cover two rect- 

 angular openings S| and S 2 , called steam ports, whil.- the h<,lln\v 

 part of the valve is opposite to a third port E, called tli< / 

 kaust port. As shown at (a) the piston P would be moving 



