| 摘要 |
<p>1,134,191. Fluid-pressure servomotor systems. UNION TANK CAR CO. Jan.26, 1966 [Feb.15, 1965], No.3496/66. Heading G3P. The outflow from a sewage wet well 11 is adjusted to the inflow by a valve 14 in response to the liquid level which is sensed through a dual bubbler arrangement. Control air from a first compressor 19 is supplied through a dip pipe 33 to a closed auxiliary liquid reservoir 32 whence a second dip pipe extends into the wet well 11. The pressure developed in pipe 33 is sensed at the signal port 34a of a conventional reversing pressure boosting air relay 34 supplied by a second compressor 22. The output of this relay is coupled to the signal orifice 38a of a conventional volume boosting air relay 38 also supplied by the compressor 22. The output of relay 38 is applied above a volume of liquid in a transducer 23 which operates the flexible sleeve type valve 14 through a fixed restriction 24. Pressure-sensitive switches connected to pipe 33 cut in and out a centrifugal pump 12 at pressures corresponding to high and low levels. The liquid head in reservoir 32 may be adjusted to vary the operating characteristics.</p> |
