Models 596 and 2596 Self-Cleaning Automatic Strainers
Fabricated Carbon Steel, Stainless Steel, Copper-Nickel or Monel – 10" to 60" Sizes Cast Iron, Bronze, Carbon Steel or Stainless Steel – 2" to 20" Sizes
Design Features the idL Shaft Seal
The Eaton automatic self-cleaning strainer is a motorized unit designed for the continuous removal of entrained solids from liquids in pipeline systems, preventing damage to expensive pipeline system components. They have successfully performed in industrial, process, water & wastewater, power, paper and municipal applications for over 30 years.All Eaton automatic self-cleaning strainers feature the unique idL™ shaft seal that positively prevents leakage from the backwash shaft at the top of the strainer. The special quad seal design replaces older, leak prone packing material. With Eaton's idL seal the exterior of the strainer stays dry and clean in service, there's never any bothersome external leakage or weeping of the process media down the sides of the strainer.
Eaton automatic self-cleaning strainers with older style packing can be easily retro-fitted with the new idL seal. Kits are available for most strainers. You can download complete instructions and see a slide show illustrating a typical retro-fit installation in the Library.
Applications Overview
Eaton's automatic self-cleaning strainers are commonly used on water service where the disposal of debris and backwash water is not a problem. Continuous flow is assured and protection is provided for nozzles, pumps, valves, heat exchangers and process equipment.
These units can also successfully handle other fluids such as white water, black liquor, starch, fuel and lubricating oil, caustic solutions and cooking oils. A determining factor in these cases is the recycling of the backwash fluid. Automatic self-cleaning strainers will significantly reduce maintenance costs and provide uninterrupted flow. They are a particularly worthwhile investment where the solids loading is high or upset conditions occur. Frequently, cleaning and servicing of manual strainers is costly, and if not properly attended, serious disruptions to the entire piping system can occur. Also, they are an ideal solution for maintenance problems where the strainer is in an inaccessible location.
Typical Applications
Automatic self-cleaning strainers are used in nearly every industry to strain fresh, brackish, or salt intake water for plant services; cooling, process, fire protection, etc.
- Process Industry – Protect heat exchangers, pumps, valves and water spray nozzles.
- Power Industry – Protect heat exchangers, pump seal water, traveling screen wash water.
- Pulp & Paper – Removing fibers from white water filtrate preventing clogging of nozzles. Separate bark and chips for recycling.
- Sewage/Waste and Water – Straining secondary effluent – thereby protecting spray nozzles while also providing clean plant service water.
- Primary Metal Industry – Provide clean water for quenching, descaling, blast furnace cooling.
Operation
The debris-laden dirty fluid enters the strainer's large bottom chamber where the line velocity is reduced. Flow continues upward, passing radially through the “sealed” screen element. Unwanted materials are trapped on the inside of the screen. The flow is uninterrupted and the strained clean fluid continues into the outer annulus of the strainer body and exits through the outlet nozzle.
Backwash cleaning is accomplished by utilizing the pressure differential between line pressure and atmosphere. A hollow full flow backwash arm - extending the full length of the screen element – rotates slowly inside the screen and is piped to atmosphere. The port shoe is in proximity to the screen and its opening is equivalent to the “debris collector” sections created by the convolutions and/or the vertical collector bars in the DuraWedge™ elements. Eaton's special idL™ seal for backwash shaft replaces older style packing material so the outside of the strainer stays clean and dry with no process media leaking down the sides of the strainer.
When cleaning is required, the automatic backwash valve opens the system to atmosphere – causing a high velocity reverse flow across the isolated section of the screen. Dirt and debris are flushed from this segment of the screen into the backwash arm and out of the strainer via the backwash piping.
During the backwashing cycle the main flow is uninterrupted and continues to be strained in the normal manner. A manual throttling valve is recommended after the control valve. Thus, backwash flow can be regulated and balanced for optimum performance and reduction of water loss.
An automatic control system consisting of a discrete mounted electrical panel, pneumatically or electrically actuated valves and a differential pressure switch operates the strainer. The cleaning cycle can be set to “activate” by differential pressure and/or on a timed cycle. The control system will .automatically close the backwash valve after the screen element is properly cleaned. The unit can also be operated manually from the control panel or in the continuous backwash mode.
For more information, contact us by phone 1-888-924-6233 or by E-mail.
