Duplex Filters

Continuous Filtration Without Downtime

Hydraulic duplex filters are designed to provide uninterrupted filtration in hydraulic systems, ensuring clean fluid flow even during maintenance. With two filter housings integrated into a single unit, these filters allow one side to be serviced while the other remains in operation – making them ideal for systems where uptime is critical.

At Hydraulics Online, we supply duplex filters from a wide range of global manufacturers – including MP Filtri and many others – with expert advice to help you select the right configuration for your system.

Our website shows only a selection of what we supply. For impartial advice and access to our full range of hydraulic components, contact our expert team.

Duplex filter. For impartial advice and access to our full range of hydraulic components, contact our expert team.

A duplex filter is a dual-chamber filtration unit installed directly into hydraulic piping. Each chamber contains a replaceable filter element that captures solid contaminants from hydraulic fluids and lubricating oils.

When one filter element becomes clogged or requires replacement, flow is diverted to the second chamber using a manual or automatic changeover valve. This ensures:

Continuous system operation
No interruption during filter maintenance
Improved system reliability and cleanliness

Uninterrupted filtration – maintain system uptime during filter changes
Efficient contaminant removal – protects pumps, valves, and actuators from wear
Extended component life – reduces risk of damage from solid particles
Flexible installation – suitable for high-flow and high-pressure systems
Service-friendly design – quick access to filter elements without system shutdown

These features make duplex filters essential in marine, industrial, mobile, and energy-sector hydraulic systems.

Can duplex filters handle high-pressure systems? Yes – we supply models rated for a wide range of pressures and flow rates.

How do I know when to switch filter chambers? Many duplex filters include clogging indicators or differential pressure gauges to signal when a changeover is needed.

Are duplex filters suitable for mobile equipment? Absolutely. Their compact design and continuous operation make them ideal for mobile and off-highway systems.