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Diverting Cartridge Valve Duplex Strainers

 

Cutaway of 53BTX duplex strainer
 
The 53BTX style duplex strainer uses a special ball valve-like diverting cartridge to divert flow from one chamber to another.  The 53BTX style is available in cast iron, steel, 316SS and bronze with ¾" to 4" connections.

Prior to this innovation, most duplex strainers in this size range operated like our model 50 duplex strainers (5" through 8" sizes), using a tapered plug valve to divert the flow to either chamber.

 

The diverting cartridge valve design contributes to both easier and safer strainer basket servicing by eliminating seepage during basket chamber access. This gives you time to clean or replace the strainer basket without having to worry about leakage and overflow. This also results in elimination of clean up after servicing the strainer basket.

 

The diverting valve is in the form of a cartridge, so it can be easily rebuilt; something not easily (or inexpensively) accomplished with a tapered plug valve design.

 

When a strainer basket needs to be cleaned, the lever handle is turned to take it out of service and to divert flow through the other chamber. The position of the handle clearly indicates at all times which chamber is in service. No special tools are needed to access the strainer basket for cleaning. The chamber is first drained and then the cover is lifted and swung clear of the chamber opening.

 

The flow diverting cartridge does not require manual internal or external ball support adjustments and the low operating torque means the strainer can be operated with an easily turned lever handle. A double sealing system on both the upper and lower stems guards against leakage. Special reinforced polymer seats are used for extended service life. Should cartridge service become necessary, it’s easy to accomplish by removing four bolts.  The cartridge comes right out through the top of the strainer. There’s no need to take the strainer completely apart or to remove it from the pipeline.

 

The 53BTX has a compact, low profile design to fit into spaces other duplex strainers cannot, yet it still uses full-size strainer baskets and provides a low pressure drop performance.  When comparing different brand duplex strainers, always compare the clean differential pressure for your intended flow rate and particle retention size.

 

We've taken a unique approach to this website.  The basic ordering information is listed in chart form.  Each duplex strainer has its' own customizable datasheet, providing you with important specification information such as pressure drop, inlet velocity and screen velocity.

 

The suggested maximum flow range for each size duplex strainer are based upon maintaining a minimum fluid velocity of 4 feet per second and a maximum of 2 PSI clean pressure drop with the standard perforated basket for that size.  Using the "2 PSI guideline", the maximum resulting fluid velocity is approximately 6 feet per second.  It is okay to increase the flow rate a little as long as the clean differential pressure drop is within ≤2 PSI.

 

Use the navigation menu above and select the desired material of construction, this will bring you to a chart of all the sizes and designs available in that material along with links to customizable datasheets and outline drawings.