Overview
Polytech’s gravity bed filters offer automatic operation and use low cost bulk roll filter media. They are well suited to applications with moderate contaminant levels. Gravity bed filters are a great, reliable filtration solution with no seal maintenance.
Applications
- Creepfeed Grinding
- Surface Grinding. Rough: 63 rms & Above
- Surface Grinding. Medium: 32 - 16 rms
- Internal & Centerless Grinding
- Abrasive Belt Grinding
- Cutoff Saws
How it Works
Contaminated liquid flows through non-woven synthetic filter fabric supported by the conveyor belt.
As filtered contaminants restrict the liquid flow, the liquid level rises and actuates a float switch which starts the conveyor.
Unlike so-called “deep bed filters” which utilize a submerged edge seal to prevent contaminated coolant from leaking directly into the filtered coolant tank, the filter paper contains the entire pool of liquid and filter paper is transported beneath the liquid. You get reliable filtration without seal maintenance.
Design and Customization
Gravity filters are available as filter chassis only or fully outfitted with tank, pump and electrical controls. Gravity filters may be combined with other filters and separators such as:
- Magnetic Separators
- Cartridge Filters
- Depth Filters
to meet process and clarity goals. Speak to one of our engineers about your specific needs.
Specifications
| Model | Filter Area (Sq. Ft.) | Rated Flow (GPM, max) |
Media Width | Basic Dimensions (in) L x W x H |
| PG3 | 3 | 11 | 19 | 51.2 x 22.8 x 17.3 |
| PG4 | 4 | 13 | 19 | 63 x 22.8 x 17.3 |
| PG9 | 9 | 26 | 27 | 68.9 x 30.7 x 17.3 |
| PG13 | 13 | 40 | 39 | 72.8 x 42.5 x 17.3 |
| PG18 | 18 | 53 | 39 | 92.5 x 42.5 x 17.3 |
| PG29 | 29 | 66 | 39 | 112.2 x 42.5 x 17.3 |
| PG32 | 32 | 92 | 55 | 122 x 59.4 x 17.3 |
| PG41 | 41 | 119 | 55 | 141.3 x 59.4 x 17.3 |
| PG48 | 48 | 145 | 55 | 161.4 x 59.4 x 17.3 |
| PG56 | 56 | 172 | 55 | 181.1 x 59.4 x 17.3 |
| PG64 | 64 | 198 | 55 | 200.8 x 59.4 x 17.3 |
| PG71 | 71 | 225 | 55 | 220.5 x 59.4 x 17.3 |