The Web, motorized, automatic, self-cleaning strainer, provides
continuous debris removal from fluid piping systems that demand full time
The Web is particularly effective in fluid applications where unattended
service, high solids loading and/or uninterrupted flow requirements deem
a basket strainer and its attendant maintenance problems impractical.
Any of the Model SFA Strainers, applied correctly, will prove efficient
and cost effective compared to simplex/duplex strainers or other automatic
Figure 1 - Cut-away of Web
showing fluid flow during operation.
Port/straining element interface during
Sequence of Operation
- Debris laden fluid enters through inlet to inner chamber. (Fig. 1)
- Dirty fluid flows upward and outward through the strainer element
- Debris is retained on the flat face of the strainer element, while
strained fluid continues to outer chamber and exits through strainer
outlet. (See inset)
- During backwash or cleaning cycle, the motor/ gear reducer (B) is
engaged and drives the hollow drive shaft (C) and hollow port (D) around
the inner circumference of the strainer element.
- The backwash assembly (C), (D) and (E) is opened to atmospheric pressure by opening
the backwash control valve (not shown).
- Flow reversal occurs at the port/straining element (F) interface because
of the pressure differential described in 5. (See inset)
- Debris is effectively vacuumed from the full length of the straining
element by a vigorous reverse fluid flow and into the hollow port; down
the hollow drive shaft and out the backwash outlet (G).
- The hollow port continues to sweep the full length of the strainer
element until the cleaning cycle has ended.
- The strainer will provide continuous uninterrupted fluid flow during
the cleaning operation.
- The cleaning cycle can be set for continuous or intermittent backwash.