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Duplex Basket Strainers


Duplex Strainers and Filters

Purpose

Oxford Filtration pipeline strainers and filters protect pumps, nozzles, valves, heat exchangers and other expensive pipeline equipment from harmful contamination by catching dirt and debris.


Application

Oxford Filtration duplex strainers and filters provide a simple, cost effective way to separate particle impurities from fluid systems. Duplex strainers are ideal for applications where continuous flow must be maintained, with no flow interruption for basket cleaning. Model XD duplex basket strainers are limited to a maximum working pressure of 14 barg at 50C (lower pressure allowable at a higher temp).


Oxford Filtration strainers are listed by Underwriters Laboratories, Inc. (U.L.), and are individually tested to U. L. quality control specifications. These cast pipeline strainers are manufactured according to international standard A.S.T.M. F1199 for use in industrial and marine applications.


duplex filter diagram
  • Hand clamp requires no special tools on low pressure models.
  • Valve handle shields side in use.
  • Accessible swing yoke closure for easy basket cleaning.
  • Continuous flow without interruption during changeover.
  • Tapered valve plug for durability.
  • Drain connections on each basket chamber.
  • Interchangeable perforated, finer mesh and double area baskets.
  • Bodies individually pressure tested to U.L. specifications.
  • Spring handle holds basket on seat.
  • Independent gland for external stem packing access.
  • Adjustable locking flange establishes valve clearance.
  • Mounting feet provided.

Model XD Series Duplex Strainers

Model XD series duplex strainers are furnished in both standard or high pressure models with flanged, screwed, socket weld or butt weld port connections. Internal channels are 100% full-flow, having the same cross-sectional area as the equivalent pipe size. Standard pressure models are furnished with our quick-opening, hand-clamp for easy access. High pressure models are stud and nut body cover closures.

Materials of contruction include cast iron, carbon steel, stainless steel , bronze or aluminium. Units fitted as standard with stainless steel baskets but also available in brass or monel. Special valve plugs can also be furnished in stainless steel or other materials.

These duplex strainers have a built-in, tapered plug valve that directs flow through either side without shutting off the flow. A valve handle guard shields the side in use. The standard valve handle swings over the inlet port. Special reverse valve handles that swing over the outlet port can also be furnished. Drain plugs are provided in each of the valve and basket chambers. An adjustable locking flange holds the valve plug on its seat.

A separate, external gland is provided to allow easy access to valve stem packing without complete disassembly, even while in service. Strainer baskets are fabricated from perforated metal. The smallest common perforation size is 1/64 inch in brass and 1/32 inch in stainless steel. Filter baskets are manufactured by using fine mesh wire cloth over supporting perforated metal. Interchangeable strainer, filter and double element baskets provide a flexible range of operating choices. The basket is held on its seat by a spring basket handle. Normal flow is through the interior of the basket which then contains the collected debris when the basket is lifted out for cleaning. Reverse flow is also possible if desired. Magnet inserts are available to help eliminate fine metallic ferrous particles.

High Pressure Models

All high pressure models with stud and nut closure are supplied with balancing valve assemblies to equalize pressure and ease valve turning. These should be specified on standard pressure models when used above the following pressures: 3/4” through 1-1/2” inclusive, 100 psig; 2” & 2-1/2’ , 80 psig.

An optional lifting jack can be provided to lift the valve plug off its seat for ease of valve turning in difficult service.

Duplex Basket Strainer Specifications: click image to download pdf or click a link to see more

Screwed Connections Specifications

» Cast Iron Strainers
» Cast Steel Strainers
» Cast Bronze or Aluminium Strainers

Flanged Connections Specifications

» Cast Iron Strainers
» Cast Steel Strainers
» Cast Bronze or Aluminium Strainers