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Acme "ACRS" Automatic Self-Cleaning
Scraper Strainers For Extreme-Duty Filtration
 Acme automatic self-cleaning scraper strainers are designed for fine and coarse filtration. They can be installed with full confidence in the most extreme duty applications as they are able to remove small particles from dirty or contaminated fluid flows, even when large particles are present.. The Acme design is particularly suitable for large particles because they use dirty water for the blowdown cycle. The particle size is not limited by the cleaning suction arm inlet or the size of the backwash outlet opening, common limitations of conventional backwash-type units. Rotating the blades scrapes the inside surface of the screen, dislodging foreign matter, which is then flushed away with dirty liquid by automatic or periodic blowdown. There are two models of Acme automatic scraper strainers:
Model: ACRS-L: Designed for "in-line" pipe installations. This design also has a flanged bottom
section, which provides inspection access without having to remove the top flange assembly. This flanged bottom section can be sized to act as a collector if so required by the specific application.
Model: ACRS-OF:
Designed for offset installations. The inlet and discharge connections can be at different levels or in different directions. Both models are fabricated units. Standard materials of construction for body and bonnet are carbon steel, 304 stainless or 316 stainless steel. Rotor types available are standard blades in one or more sections, brush type in stainless steel or Teflon, which are self-adjusting for efficient cleaning. Worm-type rotors are also available. Perforated metal, mesh or wedgewire screens are provided depending on the
specific application. An electric motor with an associated gear train drives the scraper shaft. A timer programmes the operation of the scraper motor and the blowdown valve. A differential pressure switch is standard on all units and will override the programmed operation if the pressure drop across the Acme scraper strainer exceeds a preselected value. Visual and audible alarms are incorporated in the control panel of the unit. Because of their construction, durability and flexibility, Acme automatic scraper strainers are a cost-effective solution to a wide range of demanding filtration applications.
Perforated Metal Screens:
Available in brass, 304 or 316 stainless steels, Monel, etc.
For fine perforations a large wire mesh may be used to provide additional rigidity.
Wedgewire Screens:
Used for fine screening, are very rigid and are more clog-resistant than wire mesh screens. They have a reinforced construction and wedge shaped profile reducing the possibility of retaining particles smaller than the screen opening.
Wire Mesh Screens:
Manufactured from woven wire cloth in a variety of metals. They are used for fine straining with openings unachievable with perforated metal.
Major System Components 1. Control panel enclosure, NEMA 1,12 or 4 with terminal block, indicating lights and selector switch. The panel is installed on the strainer or supplied separately for remote installation.
2. Fused circuit and magnetic starter with overload for the scraper motor.
3. Adjustable cycle timer for the scraper motor and blowdown valve operation.
4. Differential pressure switch for scraper motor operation.
5. Blowdown valve, electrically actuated.
6. Integrated audible and visual alarm circuit with contacts for remote supervision.
Options A. 230V, 380V, 400V or 575V; 1 pH or 3 pH; 50 or 60 Hz.
B. Disconnect switch, door interlocked.
C. Control of other filtration system components, such as pumps, filter presses, automatic valves, associated controls, etc., all to be incorporated into a single Acme control system.
D. PLC control of the complete system as detailed above.
E. Pneumatic interface for valve actuation or other pneumatic items
included in the above.
F. Control of isolating knife valves and flushing solenoid valves associated
with waste collector systems attached to the scraper strainer.
G. Control of vacuum pumps in the drain line for Acme scraper strainers installed on the suction side of main system pumps.
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