The Roberts’ Unisweep® design features distinguish it from other surface wash agitator systems
. Roberts’ stainless steel Unisweep® features a unique cone-ported nozzle that concentrates flow for maximum agitation, while providing positive back-flow prevention.
Other distinguishing design features include all stainless steel unitized construction (including center bearing), threaded removable end caps, and threaded stainless steel lined nozzles.
NSF 61 Listed Unisweep® surface wash agitator come in four models and are acceptable for all applications including granular activated carbon systems. The Unisweep agitator is an efficient and economical surface wash system.
Style W – Standard Uniformity Washing and Agitation
The Style W Unisweep is Roberts most frequently specified model. It is designed for controlled flow rate systems which require routine surface wash agitation to preserve the original integrity of the filter. The high efficiency, straight line design rotary agitator ejects streams of pressurized water above and parallel to the surface of the filter media bed. Nozzles on the horizontal centerline of the arm are positioned at a 15º downward pointing angle, producing maximum media agitation for more complete scouring during backwashing. The Style W Unisweep is available with rotation indicators to allow the operator to visually verify proper system operation during each backwash cycle Available in 3 to 14 foot (.91m – 4.26m) lengths.
NOTES: Stainless steel lined, threaded nozzles for longer life. Removable end caps for cleaning. Unitized stainless steel construction, no plastic housings.
Style IW – Maximum Uniformity Washing and Agitation
The Style IW Unisweep is designed for larger surface area filters. Its S-shaped design assures more uniform scouring than conventional systems, especially in filter corners. The Style IW Unisweep follows the same basic unitized construction design of the Style W. The center bearing housing is mounted on a straight arm, which is then fusion welded to a reduced-diameter curved end section. The Style IW Unisweep is available with rotation indicators to allow the operator to visually verify proper system operation during each backwash cycle. Units are available in 7 to 14 foot (2.13m – 4.26m) lengths.
Style SW – Subsurface Agitation for Tertiary Filters
The Style SW Unisweep is specially designed for tertiary filtration. It provides a subsurface sweep that delivers supplemental scouring action at the sand/anthracite interface of dual and multi-media filters. The Style SW Unisweep uses the straight-line design of the Style W Unisweep but has nozzles positioned parallel to the direction of rotation. Each Style SW Unisweep is supplied with a rotation indicator to allow the operator to verify proper system operation without uncovering the agitator arm. Available in 3 to 14 foot (.91m – 4.26m) lengths.
Style DW – Dual Arm for Maximum Cleaning
The Style DW Unisweep combines the advantages of surface and subsurface agitation. Inversely positioned nozzles propel each arm in opposite directions, creating maximum turbulence. Each Style DW Unisweeps is supplied with a rotation indicator to allow the operator to verify proper system operation without uncovering the agitator arm. Units are available in 3 to 14 foot (.91m – 4.26m) lengths.
Material: Housings and Arms: 304 or 316 Stainless steel
Nozzles: Delrin with 304 or 316 Stainless steel sleeve