| 摘要 |
A sewage pumping apparatus is provided for delivering sewage collected by gravity in a wet well to a force main. The sewage pumping apparatus comprises a motor controlled pump in fluid communication with the wet well for supplying sewage to the force main via a pinch valve. A fluid parameter sensing device is provided at the outlet of the pump for producing an electrical signal output proportional to the sensed fluid parameter (pressure or flow rate). A Digital Process Controller (DPC) receives and compares the electrical signal from the fluid parameter sensing device to a system setpoint and produces a signal outputs to open or throttle the pinch valve in accordance with the desired system backpressure to prevent overloading or cavitation of the pump and to clear blockages in the system.
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