| 摘要 |
1,155,332. Centrifugal pumps. U. ESTERER. Oct. 13, 1967 [Oct. 22, 1966], No.46784/67. Heading F1C. [Also in Division H2] In a pumping apparatus for emptying a road tanker, when a valve 8a, Fig.1, in the discharge line is opened the consequent flow causes a pendulum switch 7a to connect a resistance (16, Fig. 2 not shown), into the exciter circuit of a D. C. electric driving motor 1a for the pump 18, to thereby increase the motor speed. The resistance may be variable to vary the speed. |
