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A backwashing sewage filter

Detailed introduction Summary

  The backwashing sewage filter is innovated and improved on the principle of traditional filter, and have a new structure. By setting a valve plate to divide the filter into two sections: the anterior filter cylinder maintains the normal filtration, and by adjusting the valve plate’s position, the posterior can change the flow direction of water relative to the filter screen , namely from the inside to the outside, or from the outside to the inside.In addition, the sewage outfall is arranged in the posterior segment trailer . In this way, the filter can be back flushed and the dirt can be removed easily.   


Zhuzhou Hong Xin Industrial Co., Ltd.

Backwashing sewage filter is suitable for all kinds of water supply system, such as water supply system and industrial cooling water system, especially for 24-hour continuous operation. The utility model can filter out various impurities in the condition of continuous operation without stopping, to ensure the safe and reliable operation of the system equipment.



 型号/ 数据

公称直径

额定流量(m3/h)

D

L

A

排污口径

HF-50

DN50

19

125

410

100

DN25

HF-65

DN65

28

150

410

100

DN25

HF-80

DN80

50

200

410

100

DN25

HF-100

DN100

80

200

470

110

DN40

HF-125

DN125

125

200

530

110

DN40

HF-150

DN150

180

250

610

120

DN50

HF-200

DN200

19

300

750

150

DN50

HF-250

DN250

490

350

900

150

DN50

HF-300

DN300

710

400

1100

200

DN65

HF-350

DN350

970

450

1200

150

DN80

2 Operational principle
  The backwashing sewage filter is made of stainless steel or carbon steel cylinder, stainless steel filter screen, butterfly valve and discharge device.           
Normal operation: the valve plate is in the open position,and the sewage outlet is closed.Then the water flows from the filter cylinder to the outside, while the debris is collected in the filter cylinder, concentrated in the posterior section, the water normally filters out.
When discharging: close the valve plate, while opening the drain valve. Due to the blocking of the valve plate, the water flows from the front end of the filter cylinder outward. Because the sewage outfall opened, the posterior water is discharged and the pressure reduced. Then part of the water flows from the outside to the inside, washing off the debris adhered to the filter cylinder and    discharges it from the sewage outfall, to achieve reverse back flush .


After discharge, close the drain valve, and open the valve plate.Then the water back to the normal filter state.          
 As the sewage outfall is small, the water flow is relatively small, and the sewage discharge time is short, the sewage system has little effect on the normal operation of the system.Therefore, the system can run continuously without downtime.
   qualification
working pressure:≤1.6MPa  working temperature:≤170℃
Screen standard:6~100目  drag losses:≤1.5KPa
  technical parameters



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