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Eaton AFR Tubular Backwashing Filters
4 to 8 chamber automatic filter in about 1 square meter
The Eaton AFR is a compact tubular backwashing filter. It holds 4 to 8 filter stations in one body and cleans with two valves: an internal diverting valve and one drain valve. It is the compact form of the AFC manifold system.
Use it for high-flow, water-like liquids when floor space is limited and retention must reach 1 micron. Solids range is 1 to 1,700 microns. Flow is up to 2,000 GPM (454 m³/hr). Backwash uses less than 2 percent of system volume. Filtered flow continues while one station cleans.
An AFC mounts each station on shared inlet, outlet, and drain manifolds. Each station needs its own valves. An AFR does not. The body contains the diverting valve, which isolates one station in sequence. The drain valve opens only during backwash.
Four to eight AFR stations use 2 valves. The same count on an AFC uses 3 valves per station, or 12 to 24 valves. Fewer valves means fewer leak points and less maintenance.
AFR vs AFC Footprint
A standard AFR holds 4 to 8 stations in one housing. Floor space is about 1 square meter, including for retentions down to 1 micron on water-like liquids. Stacked AFC manifolds still take more floor area and more valves.
Footprint: about 1 m². Stations: 4 to 8. Valves: 2. Retention: 1 to 1,700 microns. Flow: up to 2,000 GPM (454 m³/hr).
How the AFR Backwashes
Up to eight tubes sit in a circular array. Liquid enters the base and flows outside-in through the elements. Solids collect on the outer surface and form a cake that traps finer particles.
A timer or differential-pressure switch starts the cycle. The diverter rotates to one tube, isolates it from inlet flow, and opens it to the upper drain header at atmospheric pressure.
Clean liquid from the outlet header then reverses through that tube and carries the cake out the drain. Differential pressure stays balanced along the element, so the full length cleans. The other tubes keep feeding the outlet.
Performance
Utilities
| Site connections | |
|---|---|
| Backwash water | Minimum 45 PSIG (3 bar). |
| Air, automatic units | 60 to 120 PSIG (4 to 8 bar) at 5 CFM (140 dm³/min). |
| Power, automatic units | 120V AC or 240V AC, 50 or 60 Hz. |
Frequently Asked Questions
What is an Eaton AFR filter?
A compact tubular backwashing filter with 4 to 8 stations in one body. An internal diverting valve isolates one station. One drain valve opens during backwash. Two valves total.
How does the AFR differ from the AFC?
An AFC uses three valves per station on shared manifolds, 12 to 24 valves for 4 to 8 stations. The AFR uses two valves and about 1 square meter of floor space. Both are tubular backwashing filters. See the tubular backwashing filter overview.
What flow and retention does the AFR handle?
1 to 1,700 microns, up to 2,000 GPM (454 m³/hr), for water-like liquids. Backwash uses less than 2 percent of system volume.
Does the AFR stop flow during backwash?
No. One tube is isolated and reversed to drain. The other stations keep sending filtered liquid downstream.
What utilities does an automatic AFR need?
Backwash water at 45 PSIG (3 bar) minimum. Automatic units also need 60 to 120 PSIG air at 5 CFM, and 120V or 240V AC at 50 or 60 Hz.
Need an AFR sized to the line?
Request a Technical ProposalSend flow, retention, pressure, and fluid on the inquiry form. Engineering replies within 1 business day. Or call 908.362.9981.