DFN Low Pressure Duplex Filter Assemblies - Duplex Filter Housings & Assemblies - Hydraulic & Lubricating Filtration Systems

Hydraulic & Lubricating / Filtration Systems

DFN Low Pressure
Duplex Filter Assemblies

Donaldson Hy-Pro duplex filter assemblies for low and medium pressure hydraulic and lube oil systems where service can't interrupt operation. Compact aluminum housing with 4-way trigger valve sealed from atmosphere. An ideal upgrade for legacy AutoKlean-style filter assemblies.

DFN Low Pressure Duplex Assembly

Product Overview

DFN duplex filter assemblies deliver the same continuous-service capability as the high-pressure DFH series in a compact, lightweight aluminum housing for lower-pressure systems. With a squeeze of the trigger and a turn of the wrist, a fresh element comes online while the used element valves out of service, all without stopping flow. Internal equalization and external vent ports automatically purge air from the standby housing, preventing the air-induction failures that cause unplanned downtime in lesser duplex designs.

Trigger-actuated changeover for service without stopping flow
Two series: DFN19 (888 psi) and DFN39 (350 psi)
Compact, sealed 4-way 2-position housing
Internal equalization and external vent ports prevent air induction
DFE-rated G8 Dualglass media with βx[C] ≥ 1000 efficiency
Optional water-removal media for combined particulate and water capture
Anodized aluminum head and bowl construction
Optional integrated bypass valve and ΔP indicator (visual or electric switch)
Compatible with HP19 and HP39 replacement elements
Direct upgrade path for legacy AutoKlean-style filter assemblies

DFN19 vs DFN39

DFN19

888 psi max, 25 gpm max. Higher pressure rating for compact hydraulic and servo systems with lower flow rates. 1" Code 61 flange or BSPP connections.

DFN39

350 psi max, 70 gpm max. Higher flow rating for turbine seal oil, boiler feed pump, and FD-ID-PA fan lube applications. 1½" Code 61 flange or BSPP connections.

Specifications

Max Pressure (DFN19)

888 psi (61.2 bar)

Max Pressure (DFN39)

350 psi (24.1 bar)

Max Flow (DFN19)

25 gpm (95 lpm)

Max Flow (DFN39)

70 gpm (265 lpm)

Filtration

βx[C] ≥ 1000

ΔP Indicator Trigger

32 psid (2.21 bar)

Fluid Temperature

30°F to 225°F

Element Collapse

450 or 3000 psid

Media Options

G8 Dualglass (M) Dualglass + Water (A) Stainless Mesh (W)

Typical Applications

Turbine seal oil and bearing lube oil systems
Boiler feed pump and condensate systems
FD-ID-PA fan lube oil
Hydrogen seal oil systems
Wind turbine gearbox lubrication
Mechanical and electro-hydraulic control systems
Hydraulic, gearbox, and servo systems requiring continuous service
AutoKlean-style filter retrofit and upgrade applications

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