Model AP | Cut-Away Image | Dimensions & Flow | General Drawings | Get Quote

Liquids other than water, such as chemicals, acids, white water (paper mills), sewage, and ammonia flushing liquor (coke plants) can also be effectively strained.

Installation:
Used when working pressure is low. the strainer is compact-with small face-to-face, width, and height dimensions.

Design:
The strainer consists of a cylindrical drum with a number of threaded holes containing one of many types of straining media. The drum is supported on a rotating shaft fitted with bearings and is contained in a body having a vertical backwash slot opening adjacent to the drum surface. A pressure backwash shoe is inserted inside the drum, directly opposite the backwash slot.

Operation:
The liquid to be strained enters the inlet connection located in the lower portion of the body and flows around the outer surface of the drum. The suspended particles are retained in the media pockets and the clean liquid passes through the media to the inside and bottom opening of the drum-leaving the body at the outlet connection located diametrically opposite the inlet.

Backwash:
High pressure liquid from the discharge side of the pump or from some other source is diverted to the backwash shoe. As each row of straining media passes between the backwash shoe and the backwash slot, the high pressure liquid flushes the suspended particles from the media. The amount of high pressure liquid needed to effect proper backflushing is low and will vary, depending on the amount of suspended particles in the liquid being strained. The inlet and outlet valves are kept open partially in order to obtain a minimum pressure drop across the strainer with low wastage. Periodically, these valves should be opened all the way to obtain a more thorough cleaning action. The backwash piping should discharge into an open funnel immediately after the backwash outlet valve.

Automatic Backwash Control:
In lieu of manually operated backwash valves, an automatic control can be furnished to permit intermittent backflushing. This control consists of motor or pneumatic cylinder operated ball valves (one at the backwash inlet and one at the backwash outlet), actuated by a timer .

Adjustment and Shearing Action:
The clearance between the backwash slot and the drum is equal to or smaller than the opening presented in the media and can be adjusted easily by two locknuts on the threaded part of the top section of the shaft. The backwash slot contains a knife-like edge which enables the strainer to shear debris such as wood, shells, fish, and other suspended materials which may extend beyond the surface of the drum-with no resultant damage tot he drum, straining media, or drive unit.

Inspection:
The straining media can be easily inspected or changed through an opening in the side of the strainer body. The cover of this inspection opening can be furnished with the same material as the body construction - or with a transparent cover to permit visual inspection of the straining media while the strainer is in operation. Or the entire drum assembly can be lifted from the body for inspection or changing of media.