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Bag filter housings are used in this industry due to their relatively large surface area of filtration and because the non-sealless type pumps require fine filtration. I spoke with one coolant manufacturer who noted that some pumps recommended filtration as fine as 25 microns, finer then some of the additives used to improve coolant performance!
Our high pressure coolant pumps do not require the fine filtration which piston, plunger and centrifugal pumps do because we do not have cups, packing or mechanical seals. Thus our pumps provide the advantage of reducing your filtration requirements in support of less expensive filter bags which are replaced less frequently. When a clogged filter bag is thrown away it typically contains a few gallons of coolant, so replacing them less frequently reduces overhead costs. When using our sealless coolant pumps, your filtration requirements will likely be dictated by other equipment in your system, such as rotary unions or the tooling itself. In some cases when filter bags are not required at all we can replace the perforated support basket with a mesh lined basket.
Our bag filter housings are available with displacement balloons; an elliptically shaped hollow stainless steel cylinder designed to be placed within the center of your filter bag, thus reducing the volume of coolant held within the bag without reducing surface area. Therefore when the bag is removed from the vessel there is less drainage time required and less coolant loss. We can also provide powerful 9300 gauss magnets suspended in the center of the filter bag to attract ferrous particles within the coolant. These magnets significantly increase holding capacity while increasing efficiency of fine particle capture.


We can provide bag filter housings in the common #1 - #4 sizes in alloy and non-alloy materials; we can also provide filter bags or mesh lined baskets to use in lieu of filter bags; our mesh lined baskets can be fabricated to retrofit your existing bag filter housing.
| Bag Size | Surface Area (ft²) | Volume (Gallons) | Recommended Flow (GPM) |
|---|---|---|---|
| #1 | 2.0 | 2.1 | Up to 80 |
| #2 | 4.4 | 4.6 | Up to 160 |
| #3 | 0.5 | 0.37 | Up to 20 |
| #4 | 1.0 | 0.67 | Up to 40 |
Our selection of filter bags are unmatched, globally we offer the broadest selection by far. Filtration for machine tool coolant applications are typically satisfied with nominally rated, inexpensive filter bags made of polypropylene or polyester felt. One of our cost saving designs utilizes recycled materials in support of "operating green".
Why Hydra-Cell Pro Pumps?
Hydra-Cell pumps have no dynamic seals to wear, you can use 60-100 micron filter bags instead of 25 micron bags, saving thousands in annual filter replacement costs while also avoiding "over-filtering" your coolant and inadvertently stripping additives it contains, reducing coolant performance.
If you are installing a completely new coolant system and require a filter housing, we offer variety to choose from. The FLOWLINE II bag filter housing is an example of an inexpensive #2 size bag filter that would be suitable for most coolant filtration applications.
The FloWash™ portable filter cart is the industry standard for maintaining machine tool coolant sumps. Unlike traditional manual cleaning, the FloWash acts as a high-performance industrial vacuum for your coolant reservoir.
Request a Quote or Call us at 908.362.9981 to speak with a sales engineer
The FloWash portable filter cart helps keep machine coolants,
hydraulic oils and other fluids cleaner, saving time and reducing
waste.
Machining processes generate fines which become
entrained within coolant that is used for keeping tools lubricated,
cool, clean, better chip ejection and breakage. These fines
need to be removed prior to being re-used to protect various
components of the coolant system, such as pumps, rotary unions
and tooling.
The heaviest and largest materials are removed
mechanically and with baffled coolant reservoirs; fine filtration
using conventional bag filter housings provide the final level of
filtration.
Overtime the coolant sumps accumulate solids and
they need to be periodically cleaned. Until now, this was
largely a labor intensive task, requiring someone to drain the sump,
shovel-out the debris and re-fill with coolant. This routine
also requires shutting the machining center down.
The FloWash
filter system, which can be portable as illustrated or as a fixed
"in-line" configuration, performs essentially like an industrial
duty shop vacuum, sucking-up all the dirty coolant and debris within
the sump, filtering-out the particles and returning the coolant back
to the sump for reuse.
This results in less coolant loss,
reducing annual consumption and it also promotes cleaner coolant
which is essential for the machining process due to the relative
ease of cleaning-out sumps.
You may
also be interested in reading a customer success story: "On
a Roll with New Coolant Cleaning Cart"