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For use with water intake systems in industrial and marine applications, Castle Pumps can supply automatic and manual strainers which are of a patented design.

Some of the possible applications are:

  • Plate and frame heat exchangers
  • Stem tube shaft seal
  • Ballast contents
  • Bilge water
  • Engine cooling water
  • Air conditioning units

In order to aid the use and ease of cleaning, these range of strainers do not need the strainer to be taken apart. This bespoke design allows the strainer to remove any debris from the flow as opposed to trapping solids in a filter basket. These strainers can be purchased in three options; manual, motorised and automatic, dependent upon the pipe size.

Operating Data

Handled Fluid

  • Clean water
  • Sea water
  • Corrosive fluids
  • Lubricant water
  • Coolant
  • Oil


  • 1 ½ “ – 12” (Manual/Motorised)
  • 14”- 36” (Automatic)


  • Cast Iron
  • Ductile Iron
  • Cast Bronze
  • Cast Steel
  • Cast Stainless Steel
  • 25% Cr Stainless Steel

Standards/ Approvals

  • American Bureau of Shipping (ABS)
  • America Society of Mechanical Engineers (ASME)
  • Fluid Control Institute (FCI)
  • Lloyd’s Register
  • ISO-9001 (Det Norske Veritas)
  • Castle strainers are patent protected

Flange Options

  • Class 150/300
  • 125 LW

Manual/Motorised Strainers Suitable for 1.5” – 12” pipes

These strainers operate as fluid passes into the strainer and through to the screen. In order to protect from large objects the strainer has a deflector rib, which then allows the fluid that has been screened to flow freely into service. In order to move the screen against the scraper bar, the hand wheel of the manual strainer to be turned. The automatic edition has a set rotation of the actuator controlled motorised version which allows it to move. The debris is then removed after it has been transferred to the sump after occasional flushing.

Automatic Strainer Suitable for 14”-36” pipes

These automatic strainers, which are specifically designed for pipes of a larger size, provide automatic cleaning of the filter by mounting a motor on the top of the unit.

These automatic strainers operate by firstly entering the fluid and allowing it to flow through the strainer screens, and out the other side of the strainer. After this the debris is dislodged and removed from the screens outer surface by the rotating screen. This in turn moves the outer screen surface against the scraper bar. As this screen is rotating , the drain is opened leading to the debris emptying from the strainer.

Our strainers are designed with our customers in mind with improved efficinecy. Some of these savings include:

  • A lower cleaning time of 30 seconds
  • The automated strainer eliminates the need for manual cleaning
  • Internal parts are able to be changed in less than 15 minutes, making them highly efficient
  • Option of back flush is available
  • With automated/motorised strainer options there is a lower chance of cavitation from pumps downstream as a result of starved suction

Strainers IMPA Codes

  • 87 20 52
  • 87 20 53
  • 87 20 54
  • 87 20 55
  • 87 20 56
  • 87 20 57
  • 87 20 58
  • 87 20 59
  • 87 20 60
  • 87 20 61
  • 87 20 62
  • 87 20 63
  • 87 20 64

Castle Pumps are fully accredited to enable you to buy with confidence. Our accreditation includes: Our accreditation A division of the CTS Group, Part of Flow Max Ltd.