The steady flow tank is also known as the steady flow compensator. It is a vital part of the non-negative pressure water supply equipment. Non-negative pressure tank and negative pressure tank serve to eliminate negative pressure and secondary pollution and to intelligently compensate water flow when being integrated with the municipal pipeline.
When the non-negative pressure water supply equipment is put to service, the water from the tap water pipeline flows into the steady flow tank and the air in the tank is removed from the vacuum suppressor. When the water is full, the vacuum suppressor is automatically closed. When the pressure in the tap water pipeline is higher than the set pressure, the pressure transmitter sends feedback on the pipeline pressure to the variable-frequency control cabinet. Tap water may be supplied to users directly into the user pipeline via the by-pass pipe. When the municipal pipeline pressure changes or user pipeline water consumption changes, making the pipe pressure lower than the set pressure, the pressure transmitter sends feedback on the pipeline pressure to the PID controller in the variable-frequency control cabinet to adjust the output frequency of the converter via the PID controller, start the water pump units and regulate the water pump RPM to supply water in constant pressure; if the requirements for water supply cannot be met, the control cabinet will control the startup & shutdown of multiple power frequency pumps and the RPM of variable-frequency pumps to reach the requirements for water supply in constant pressure variable.
The non-pressure water supply equipment is in series connection with the municipal pipeline and therefore will not cause over suction on the pipeline or affect the water consumption of peripheral users. To free negative pressure from the pipeline, steady flow tank is added to the non-negative pressure water supply equipment. When the water from the tap water pipeline enters the steady flow tank, the exhaust valve starts to exhaust. When the water is full, the exhaust valve is off. When the pressure of the tap water itself can meet the requirement for water consumption, the system pressure signal is sent back to the variable-frequency controller via the transmissible pressure gauge. The water pump is activated and its RPM will be automatically adjusted based on the water flow. If the water flow from the tap water pipeline is smaller than the pump flow, the water in the steady flow tank can still be normally supplied as supplementary water source. In this case, the air enters the steady flow tank through the exhaust valve and the vacuum in the tank is damaged to ensure no negative pressure in the tap water pipeline.