1. THE HYDROFLOW STAR FILTER
The Star Filter Is A Packaged System Combining The Dirty Tank, Filter And Clean Tank In One Assembly, Eliminating The Balance Problem Of Multiple Components
The Heart Of The System, The Star Element, Is Easily Removed For Inspection And Service
The Star Filter Employs A Heavy Duty Dragout Which Provides Complete Removal Of Solids From The System.
The Star Filter Is A Hydraulic Vacuum Filter Which Means The Filter / System Pumps Only See Filtered Coolant Resulting In Long Service Life.
The Cellulose Pre-coat System Is An Automatic And Effective Distribution Method For Adding Filter Aids.

2. THE STAR ELEMENT
The Star Element Provides Maximum Filtration Area In The
Most Compact Configuration
The Slurry Distribution Ring Provides Accurate And Effective Introduction Of Cellulose Precoat.
The Element's Star Shape And The Filter Panel's Compact, Rectangular Design Maintain Structural Integrity After Removal From The Filter
The Patented Wet Seal Is A Positive Seal That Eliminates Solids By-pass
Stainless Steel Wedgewire Or Patented Fuse-bonded Stainless Steel Microscreen Filter Panels Are Constructed To Meet Specific Customer Requirements

3. THE STAR FILTER OPERATION
The Filtered Coolant Is Returned Directly to The Machine Tools
Dirty Coolant Enters The Rear Of The Filter. An Inlet Baffle Slows The Flow
2nd Stage Of Filtration -The Star Element Is Connected To The Suction Side Of The Pump And Draws The Fluid Through The Element Trapping Solids On The Surface.
The Star Filter Provides Two Stages Of Filtration- 1st Stage -Heavy Solids Quickly Settle To The Bottom Of The Tank And Are Removed By The Drag Conveyor

4. THE STAR FILTER OPERATION
So The Tank Remains Full And Over-weirs Back To The Dirty Tank, Allowing For Continuous Recirculation.
A Portion Of Filtered Coolant Flows Through An Air Ejector And Up To The Clean / Regeneration Tank.
The Flow Of Coolant Through The Air Ejector Creates A Suction Which Is Used To Draw Any Free Air Out Of The Top Of The Star Element
The Clean Tank Is Connected To The Suction Pipe.
Another Small Portion Of Filtered Coolant Is Used To Supply The Pressurized Wet Seal
The Regeneration Valve Is Closed,

5. THE STAR FILTER PRECOAT
Cellulose Precoat Is Used To Provide A True Depth Cake And Achieve Filtration Below 10 Microns.
The powdered cellulose is stored in a hopper that is equipped with an automatic feeder.
The Cellulose Is Quickly Drawn To The Microscreen Surface Creating A Filter Cake For Trapping Solids
The Cellulose Is Mixed With Clean Coolant And The Slurry Is Pumped To The Distribution Ring On The Star Element.

6. THE STAR FILTER FILTRATION
Dirty Coolant Enters The Filter And Heavy Solids Settle To The Drag Conveyor
The Fines In The Coolant Are Drawn By The Pump To The Star Element And Trapped In The Cellulose Depth Cake

7. THE STAR FILTER REGENERATION
As The Solids Are Trapped In The Cellulose the cake becomes compressed and dense with the weight of the solids. As the Cake builds it restricts the flow and creates a negative pressure in the suction pipe. The system sense the increase in vacuum and initiates the automatic regeneration cycle. 6 2 5
The following is the sequence of events:
The regeneration valve opens.
Coolant from the raised clean tank flows by gravity and supplies the pumps and additional coolant flows back towards the Star Element.
The backflow of coolant gently releases the compressed filter cake from the element. 3 1 4
4. The dense solids mass quickly settles to the conveyor for removal from the system
5. A Pneumatic Cylinder Then Lifts The Element And Bumps It In The Wet Seal To Further Clean The Surface
6. Following The Bump, The Regeneration Valve Closes And The Precoat Cycle Begins
7. A Conveyor Drive Runs On An Adjustable Timer, And The Solids Are Allowed To Dry On The Ramp Before Being Dumped Into The Hopper

8. BENEFITS OF THE STAR FILTER
Depth Filtration - Superior Filtration: Hydroflow has been manufacturing roll media filters for over 20 years and we know their limitations, particularly in filtration efficiency. Roll media filters rely on building a cake to achieve effective filtration. Cake building requires a good distribution in the size of solids in the dirty fluid. And even in the best case, with wheel breakdown to aid in the distribution, the filters generally only achieve micron.
Filter Area: Flat bed filters offer limited filter area and/or only regenerate a small section of media at a time. This results in high velocity through the media, further limiting the ability to build a cake and resulting in excessive media usage.
Filter By-Pass: Roll media filters are prone to by-pass as the media has a moving seal along the entire length and on both sides of the bed. The media is also subject to tearing or uneven tracking, resulting is gross bypass with no warning or indication of the problem.

9. STAR FILTER ADVANTAGESVS
FLAT BED FILTER
STAR FILTER
Large Filter Area
2 Stages Of Filtration
Depth Filtration Using Cellulose
Pressurized Wet Seal –Virtually Eliminates Solids By-Pass
Regeneration Of Entire Surface Maintains Low Velocity
Element Backwash, No Moving Belt
No Vacuum Box
Limited Filter Area
All Solids Must Be Trapped by Media
Surface Filtration On Flat Media
Moving Seal-Bypass Is Possible Each Time The Media Moves
Incremental Regeneration, High Velocity Through Small Area
Moving Belt, Transporting Out Of Filter
Vacuum Box Is Difficult To Clean

10. THE STAR FILTER ADVANTAGESVS
STAR FILTER
Wedge Wire Drum Filter
Large Filter Area Of Star
Depth Filtration Using Cellulose, Effective Distribution Of Precoat
Pressurized Wet Seal
Element Backwash, No Moving Drum Or Scrapping
Regeneration Off Entire Surface Maintains Low Velocity
No Vacuum Box
Limited Filter Area Of Drum
Surface Filtration & No Effective Precoat Distribution.
Rotating Seal On Drum
Rotating Drum, Scrapper Blade Forcing Particulate Into And Through The Wedge Wire.
Incremental Regeneration, High Velocity Through Small Area
Vacuum Box Is Difficult To Clean

11. Pressure Precoat FilterVS
STAR FILTER
Pressure Precoat Filter
Vacuum Filtration Is A Simple System And Eliminates Pumping Dirty Fluid, Complex Valve Sequences And Multiple Components
Star Element Is Easily Removed For Inspection And Cleaning
Pressurized Wet Seal
Packaged System With Integral Dirty Tank And No Large Clean Tanks And Mixing Tanks
Simple And Effective Precoat System
Pressure Filters Are Complex With Several Pumps, Valves And Components That Must Sequence Precisely For Proper Operation
Dome Filters Are Labor Intensive to Service, Tube Bundles Are Easily Damaged And Costly To Replace
Dozens Of Individual Seals Between Tube And Diaphragm Plate
Multiple Tanks, Interconnecting Piping And Valves, Difficult To Balance
Manual Or Complex Precoat System