Description
Tate Andale Model AL and AH spray-type self-cleaning strainers are recommended for severe operating conditions where the quantity and nature of the debris is such that the standard self-cleaning design is inadequate for effective removal of debris from the surface of the basket. This variation of the standard twin strainer consists of a spray pipe (either fixed or gearmotor-driven) located in the center of each basket. Unlike the manual version, liquid flowis from outside the basket, inward.

To clean a basket, the compartment is isolated by means of manual or electric motor-driven valves, and the drain valve is opened. High-pressure water is then admitted to the spray pipe. The spray pipe nozzles direct jets of water against the inside of the basket, blasting free the debris collected on the outside basket surface. The debris is flushed away through the open drain.

Water for the spray pipes can be taken from the strainer discharge provided the pressure is 50 PSIG or higher, or from a separate source. There must be no back pressure on the drain line, and the line must be large enough to keep the compartment drained. These strainers are suitable for vacuum or positive pressure operation.

Typical Strainer Specification

For the basic features of the strainer, please see the Model AL or AH twin basket strainer. In addition to that information the strainer shall be equipped with spray pipes (fixed or rotary) that shall utilize 50 PSIG of water to effectively remove contaminant from the outside of the basket and backflush the contaminant.

For fully automatic operation:
The strainer shall be equipped with motor-operated valves and a control system to facilitate automatic operation of the previously described backflush cycle.

This system shall include a pressure differential switch which will be set to activate the backflush cycle when the differential pressure across the basket reaches a pre-determined setting.

· Non-rising stem valve screws are housed in bronze sleeves and are never in contact with the liquid. · Vent valves on doors and large equalizing and drain connections on each chamber.

The side entry baskets provide the “AL” duplex strainers with the lowest pressure drop of any industrial strainer. This means that your system is less expensive to operate. · The “AL” duplex strainer has sliding gate valves with wedge seating. This means that the sealing surface of the valve disc and strainer body do not come in contact while the disc is being switched from one basket to the other. This extends the usable life of the s trainer and reduces its overall cost. The duplex strainer utilizes a natural rubber ring as the sealing surface between the valve disc and the strainer body. This provides a seal, which is ten times more effective than the metal to metal alternative. The duplex strainer includes steel plate access covers suitable for rough handling and maximum durability. Quick opening access covers have elongated bolt holes, requiring only the loosening of the retaining nuts for cover removal. Each basket utilizes a removable cover in addition to inlet port for ease of cleaning. The valve position indicators are in plain view to enable the operator to quickly determine valve position. This means that the likelihood of operator error in switching the valves, with potentially disastrous results, is significantly reduced with the “AL”.

Standard Materials
Body, Valve Housings,
Valve Discs, Glands,
Handwheels....................................Cast Iron
Guides..............................................Steel
Access Covers................................Steel Plate
Enclosed Valve Screw..................Steel
Valve shaft.......................................Bronze
Valve Rings.....................................Natural Rubber Stock
Baskets............................................304 Stainless Steel

Optional Features

	Chain drive (handwheels interlocked)
	Equalizing lines and valves
	Valve rings of bronze or steel
	Higher design pressures
	Semi-automatic operation
	Lifting davit
	Manual backflushing allows operator to clean baskets without removing them from the strainer.
	Also available in 250 pound flanged configuration (Model AH)
	Other materials of construction available upon request.

Model AL & AH Dimensions (Approx.) 150 PSIG

Model AL & AH Dimensions (Approx.) 300 PSIG