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Steel-Made Gravity Valveless Filter
 

1. Description for steel-made gravity valveless filter:
The steel-made gravity valveless series filters have been widely used for purifying surface water, removing iron and manganese, by-pass filtering of circulation water, removing suspended matters of production sewage, bio-chemically treating organic sewage, subsequent treatment after secondary sedimentation tank and water filtering of indoor swimming pool, real an ideal water treatment equipment.
At present, the valveless filter produced by our factory is divided into two categories: the filtration tank of CBL-II type is shaped square, with water filtration amount of 20m3/h- 175m3/h; and the other type of DLB-II and DLB-III are shaped round, with filtration amount of 20m3/h-80m3/h and 200m3/h-750m3/h, of which, the device with filtration volume of 20 m3/h-175m3/h will be delivered to work-site, and the one with 200m3/h-750m3/h will be pre-made for several parts, then delivered to work-site for assembly by our factory; after being made corrosion-protective treatment, the device will be delivered to the relative construction unit, when it is stuffed, the device can be made trial running and operation.

Examples of Designation of Different Type:      

                   

The inlet, outlet, washing and drainage of CBL-II, DLB-II and DLB-III series steel-made valveless filters need not be equipped with valves, they can automatically operate relying on water action, so the operation cost is low, easy for control, safety and reliable. Besides, the equipment is designed integrating water inlet tank, filter and back washing water tank in a whole, with compact structure, users only need to lay the foundation for it and connect the pipes of inlet and outlet following the relevant requirements, then they can put the equipment into operation at once. Meanwhile, such kind of filter series are equipped with top covers, so the sanitary and protection conditions are very good. The equipment can be put in the air, in addition, as compared with the steel-bar concrete filter, its empty weight is lighter due to its bituminous-sand-laid flexible foundation.

I. Description for Basic Principle:

Raw water is sent into filter through inlet pipe, water is filtered up and down on filtration layers, then clean water will be filled into the water tank through communicating pipe. When water tank is full, water is sent into clean water tank through outlet pipe, suspended matters are continuously interrupted by filtration layers, the resisting force of which is gradually increased, therefore, the water level in siphon pipe is rising. When water level reaches the mouth of siphon pipe, water will fall down from siphon, air in which can be taken away by air exhaust pipe, when vacuity reaches a certain &#118alue, siphon action occurs. At this moment, water in pipe will flow up and down through filtration layers, just back washing filter media. When water level of washing tank falls into siphon with air, damaging siphon action. When back washing to filter is finished, begins the next cycle's operation, so it is no necessary to equip with back washing pump and tower as other kind of filters.

The comparatively big-sized filter of the series, as compared with the steel-bar concrete gravity-type valveless filter of the state standard diagram, has been increased 3 serial parts in each unit, the biggest allowable &#118alue of final water head loss has been increased two grades of 1.50m and 1.90m from 1.70m of the state standard diagram, that has provided convenience for selecting products of elevation layout designed by the relevant water purification factory.

(II). Design Parameters:

1.average filtration speed: 10m/h
2.average back washing strength: 15liter/m/2second
3.duration of back washing: 5 minutes
4.final water head loss &#118alue: 1.50m, 1.70m and 1.90m (optional)
5.expansion height of back washing: 700 x 40% 100mm, additional safety height
6.layer height of filter media: 700mm support layer, thickness 270mm
7.turbidity of water inflow: less than 20 degree (used for surface water purification)
8.turbidity of water discharged: less than 3 degree (used for surface water purification) 
 
三、Comparison Table with Diagram Shown Above:

Each unit has two filters, overall unit delivered, final water head loss 1700mm

Designation of Specifications

Nominal water output of each unit and net filtered area (m3/h)

Steel filtration unit L x W x H

(mm x mm x mm)

Weight of water filling

(ton/unit)

Volume and weight for loading filter media required by each steel filtration unit (calculated with quartz sand)  (m3/T)

Flow rate of drainage when back washing (strength set 15L/M2.S or water inlet working conditions (L/S)

CBL20-Ⅱ-1700

20/2.13

2000×1100×4340

16.2

2.07/3.62

18.75

CBL30-Ⅱ-1700

30/3.19

2000×1630×4402

23.1

3.09/5.42

28.03

CBL40-Ⅱ-1700

40/4.24

2165×2000×4442

29.9

4.11/7.20

37.40

CBL50-Ⅱ-1700

50/5.33

2710×2000×4442

36.5

5.17/9.05

46.88

CBL60-Ⅱ-1700

60/6.39

2600×2500×4502

44.2

6.20/10.85

56.25

CBL80-Ⅱ-1700

80/8.50

3600×2900×4547

58.8

8.25/14.43

75.00

Dimension and Position of Pipe orifice of Steel Filter CBL20-II-1700---CBL80-II-1700(dimension unit: mm)
Because of limited space, detailed information please connect with us to ask for!

 
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