HYDRAULIC LOCK-GATE MACHINERY 



777 



diameter, in connection with these caissons are also operated by direct- 

 acting hydraulic rams working under the same pressure, the details of 



FIG. 391. Hydraulically Operated Sluice Valve. 



construction being shown in Fig. 391. The motion of the rams is 

 regulated from a valve chest with slide valves of gun-metal. 



