This guide explains what a duplex strainer is, what parts it has, and how it fits into a pipe system.
A duplex strainer cleans the liquid flow. It catches dirt, rust, scale, and other solid bits before they reach pumps, valves, or meters.
It has two basket chambers. One side works. The other side stays ready for cleaning or changeover.
A duplex strainer uses two chambers to keep liquid moving. One basket filters the liquid. The other basket stays on standby.
When the first basket gets full, a worker turns the valve. The flow moves to the clean side. The dirty basket can then come out for cleaning.
This design helps plants avoid full line stops. It works well in systems that need a steady flow each day.
A single basket strainer often needs a line stop for cleaning. A twin-chamber unit gives workers another flow path.
That second path helps keep work moving. It also helps workers clean one side while the other side keeps filtering.
A duplex basket strainer has parts that hold flow, catch dirt, and make cleaning easier.
| Part | Main Job |
| Body housing | Holds both basket chambers |
| Filter baskets | Catch dirt and solid waste |
| Changeover valve | Sends flow to either chamber |
| Inlet port | Lets dirty liquid enter |
| Outlet port | Sends cleaner liquid out |
| Cover | Opens for basket removal |
| Gasket or seal | Helps stop leaks |
| Drain plug | Releases trapped liquid |
| Vent plug | Releases air or pressure |
| Gauge port | Shows signs of clogging |
The housing is the main shell. It must match the liquid, pressure, and work site.
The baskets sit inside the chambers. They catch solid bits before those bits move deeper into the pipe system.
Basket size matters. A fine basket catches smaller dirt. A wider opening lets more flow pass but catches less waste.
The changeover valve moves the flow from one chamber to the other. It should turn smoothly and seal well.
Seals help reduce leaks near the cover and valve area. Workers should check them each time they clean the unit.
This basic diagram shows the main flow path. Real units may look different based on size, pipe end type, and pressure class.
Good installation helps the strainer work well. It also helps workers clean baskets with less trouble.
Follow these basic steps:
| Checkpoint | Why It Matters |
| Flow direction | Keeps liquid moving the right way |
| Cover space | Helps workers remove baskets |
| Pipe support | Reduces stress on the body |
| Drain access | Helps empty liquid safely |
| Gauge ports | Shows when cleaning may be needed |
Workers need room to open the cover and lift the basket. A tight space can make cleaning slow and unsafe.
The drain should also sit where workers can reach it. This helps them release trapped liquid before opening the chamber.
Industrial strainers may face pressure, heat, and harsh liquids. Standards help buyers check design and testing needs.
ASME Section VIII is for pressure vessel design. API standards may guide valves, flanges, testing, and process service needs.
| Item To Check | Why It Matters |
| Pressure rating | Matches line pressure |
| Temperature range | Matches working heat |
| Body material | Handles the liquid type |
| End connection | Fits the pipe system |
| Test records | Shows quality checks |
Not every site needs the same rating. The best choice depends on fluid type, pressure, heat, and plant rules.
Plants use different strainers for different jobs. The right one depends on flow, dirt load, and cleaning needs.
| Strainer Type | Best Use | Main Limit |
| Y strainer | Small lines and light dirt | Less space for debris |
| Simplex basket strainer | Higher dirt load | Cleaning may stop flow |
| Duplex strainer | Steady flow service | Needs more space |
A Y strainer is small and simple. It often protects pumps and meters in light-duty lines.
A simplex basket strainer can hold more dirt. It works well when the line can stop for cleaning.
A duplex strainer fits systems that need steady flow. It lets one basket work while workers clean the other side.
A duplex strainer helps keep liquid moving while workers clean one basket. That is the main reason plants choose this design.
It can protect pumps, valves, meters, and other pipe parts from dirt and solid waste. For steady-flow systems, Lianke Valve offers duplex strainer solutions that support easier cleaning, smoother maintenance, and more reliable filtration work.
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