Twentieth century hand-book for steam engineers and electricians with questions and answers; a practical non-technical treatise .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 1020
valve of large enoug]size to be durable. As is shown in Fig. 413, the tank intwhich the lifting cylinder discharges is placed high enoug Hydraulic Elevators 991 to give enough pressure to operate the motor piston^ andfrom this tank water passes through the pilot valve A tothe cylinder B. If the… … FiG. 414 sure of about 80 pounds per square inch is used to operatethe motor piston. It might be thought that having to discharge the waterin the lifting cylinder against a back pressure of 80 poundswould cause considerable loss, and make the high-pressuresystem objectionable on the score of low…
