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Pressure Leaf Filters


» Salient Features




















Much higher rate of filtration for same area of plate & frame filter.

Stainless steel filters elements, hence no repetitive cost washing & maintenance of filter cloth.

No use of filter cloth hence very low running cost and no wastage of oil.

Mechanical cake discharge in very short time without opening the filter hence saving in time and labour.

Low percentage of oil in filter cake.

Closed Operating system hence no spillage and loss of oil & very clean operation

Compact and very light hence saving in floor area and supporting structures.

Horizental & Vertical.

1-100m² filtration area.

Filtration rates are 2-3 times higher on same filter area.

Automatic cake dischange in very short time without opening the filter hence saving in time and labour.


» Technical Specifications
Vessel M.O.C
Carbon steel(M.S.), Optionally stainless steel (304, 316, 316L)
Leaves M.O.C
Outer mesh of SS- 316 and inner mesh, frame, bush and handle etc of SS-304, optionally complete SS- 316
Max. Working Pressure
5 kg / cm² ( Bar)
Max Working Temperature
120°C with Neoprene gasket and optionally 200° C with Viton / Silicon Gasket

» Vertical PLF

Model No. Filter area m2 No. Of. Leaves Max. Cake Vol.- Ltrs. Hight mm Floor Area Occupied mm x mm Net. Tank Vol. Ltrs. Total Batch Size in Ltrs.
V1 1 5 25 1300 500 x 500 150 600
V5 5 5 125 2500 1050 x 1050 580 3000
V10 10 9 250 2600 1200 x 1200 950 6000
V15 15 11 375 2600 1450 x 1450 1330 9000
V20 20 11 500 2800 1650 x 1650 1210 12000
V25 25 15 625 2800 1650 x 1650 1990 15000
V30 30 15 750 3000 1800 x 1800 2740 18000
V40 40 17 1000 3100 2000 x 2000 3600 24000
V50 50 17 1250 3300 2200 x 2200 4500 30000
V60 60 19 1500 3400 2400 x 2400 5400 36000


» Horizontal PLF

Model No. Filter area m2 No. Of. Leaves Max. Cake Vol.- Ltrs. Floor Area Occupied mm x mm Net. Tank Vol. Ltrs. Total Batch Size in Ltrs.
H 10 10 15 250 1650 x 3730 1070 6000
H 15 15 23 375 1650 x 4930 1460 9000
H 20 20 30 500 1650 x 6010 1790 12000
H 25 25 37 625 1650 x 7030 2130 15000
H 30 30 22 750 2200 x 5590 2600 18000
H 40 40 30 1000 2200 x 6790 3290 24000
H 50 50 37 1250 2200 x 7810 3890 30000
H 60 60 44 1500 2200 x 8890 4490 36000
H 70 70 32 1750 2500 x 7590 5590 42000
H 80 80 20 2000 3100 x 5330 7660 48000
H 100 100 25 2500 3100 x 6080 8840 60000


Note:-
The cake volume is the total wet cake capacity.
The above filtration rates are assuming 2% impurities in oil having viscosity of 1 cp.
The total batch can be filtered in 1 to 3 hrs depending on filter size & pump capacity.
The flow rates &batch size will very as per % of impurities, liquid viscosity & pump capicity.
Filters of higher capicity & with specific requirement can be customized as per the requirement.
Only leaves of PLF or repairing of old turn leaves can be offered.
Since development is a continuous process specifications are subject to change without prior notice.

» Working Principle
How do they work?
  Leaf Filters are ideal for solid - liquid separation & work on principle of precoating & pressure. Pre-coating is done with the help of suitable filter aid about 0.5 to 1% (Bleaching earth, supercel, hyflo, superflo etc.) mixed with the liquid to be filtered. Unfiltered liquid is pumped into the filter vessel. Initially the filter aid starts forming a precoat layer on both sided of the filter leaves, until then cloudy material comes out of the filter. Once the layer is formed, pressure starts developing, restricting the impurities. Clear liquid flows from both sides in to the leaves (filter elements), flows along the tubular channel & gets discharged from bottom of the leaf. All the leaves are mounted on a common manifold. The leaves start getting choked on both the sides by impurities forming cake, which is in wet form. Once the leaves get choked completely, the pressure rises to 3-4kg./cm2 and the output flow almost stops. This means the batch size is reached. The pump is stopped & steam / air pressure is applied from the top (without dropping the filter pressure) to to filter the material around the leaves heldup in the tank & to squeeze the cake further & reduce the liquid retention in it. The hold up unfiltered liquid in the conical portion is taken back.
How is the cake discharged?
 
In both vertical & horizontal filters the cake can be dried by steam / hot air & then discharged from the bottom with the help of mechanical / pneumatic leaves vibrator. The whole operation of cake drying takes 3-45 min. & cake discharge takes 5-10 min. For wet cake discharge water spray nozzles are provided. In Horizontal Pressure Leaf Filter wet cake can also be discharged manually by scrapping. The shell is slided over with hydraulic mechanism keeping the leaves in fixed position.

» Construction
How is the Leaf Constructed?
 
Each leaf is made of 5 ply of SS wire mesh of different gauge wires. Two outer filtering mesh are Hollander weaves & 3 inner are only for support. The 5-ply wire mesh are held together by a tubular frame & made leak proof by machine riveting. The quality of filtration & life of filter depends mainly on the quality of outer wire mesh & riveting. We at M/s. Amar Equipments Pvt. Ltd. Ensure the quality by inspecting quality of wire mesh and each leaf. Old worn out & torn leaves can be repaired by only replacing the outer Hollander weave.
Pressure Leaf filters, Vertical leaf filters, Vertical Pressure leaf filters, Horizontal Pressure leaf filters.
How is Vertical Pressure Leaf Filter constructed?
 
It consists of a vertical MS/ SS tank with filter elements (leaves) inside. The leaves are mounted vertically on a common manifold pipe, through which the filtered liquid flows out. On the top, the leaves are held by a vibrating shaft. A mechanical vibrator driven by electric motor / pneumatic vibrator is provided for vibrating the leaf shaft for cake discharge. Optionally spray nozzles can also be provided for wet cake discharge. Jacket for hot filtration can be offered if desired over flow, vent / steam / air charging pressure gauge & safety valve are provided on the top. The top cover is provided with devit arm mechanism for raising the lid for cleaning / removing the leaves. 'T' bolts are provided for quick opening and closing of top lid. A mechanical jack is provided to lift the top for cleaning / removing the leaves. Lugs are provided for mounting the PLF. Bottom openings is a simple and economical manual swing type which gives 100% opening or optionally a pneumatically actuated butterfly valve which open about the center axis and divides the bottom in 2 halves is provided.
 
How is Horizontal PLF constructed?
 
Horizontal PLF works on similar principle but the shell is horizontal & leaves are vertical on common manifold. The filter shell has 4 wheels & can be retractable by a hydraulic cylinder on a rail. Two hydraulic cylinders are provided one each for opening & closing the wedge lock mechanism between the shell & cover. A hydraulic power pack unit, Pressure gauge, vent / steam valves, panel board etc is provided. After the filtration & cake drying is over, the outer vessels is retracted, thus opening up the leaves for cake discharge,. During opening / cleaning no connections have to be removed as the cover with leaves remain in fixed position. Cake can either be discharged manually by rubber mallet or optionally pneumatic / mechanical vibration can be provided for dry cake discharge. Spray nozzles can be provided for wet cake discharge. Horizontal PLF is preferred for higher filtration area or when solid cake has to be removed manually in semidry condition & in short period.

» Uses Of plf
Edible oil Industry :
 
Bleached, winterized, Deodorized, hydrogenated, Fractionzed oils, Dewaxing, catalyst,Mineral oil, Sulphur.
Beverage Industry :
 
For Glucose, fruit juices, cold drinks, sugar, vinegar
Chemical Industry :
 
For organic & Inorganic salts, dyes, chemicals, plastizers.
Pharma Industry :
 
For Pharmaceutical intermediates, syrup, bulk drugs, antibiotics, intravenous solution.
In Petrochemical Industry :
 
Crude oil, LPG, lubricating oil, sulphur.