Hydraulic Oil Filter Elements & Housings – Models BU30E (TR-19450) · BU50E (TR-19650)

BU30E and BU50E are bypass-type hydraulic oil filtration housings, each paired with a precision element — TR-19450 for the BU30E platform and TR-19650 for the BU50E platform. The units connect directly to the high-pressure line of hydraulic and lubrication systems, performing continuous total oil purification by removing solid particles, sludge, varnish, and free water — without a motor or pump. Up to 80 % of all machine breakdowns and production stops originate from oil contamination; these bypass filters achieve NAS 5–7 cleanliness in service, dramatically reducing failure rates.

Key Features

• Bypass filtration, no auxiliary power – connects directly to 10–350 bar system pressure; max. pressure 450 bar

• Patented micro-filtration media – M, E, and X series elements provide layered depth filtration

• Removes the full contaminant spectrum – solid particles + sludge + varnish + water

• Relief valve opens at 4.5 bar ΔP – built-in pressure and flow control, safety valve, and gauge for element-change indication

• Die-cast aluminum housing (BU30E); stainless steel coated housing (BU50E)

• Bypass oil purification reduces oil consumption and extends fluid service life

• Replaceable element, non-stop maintenance – swap the cartridge without shutting down the main system

Technical Specifications

Source: manufacturer bypass filtration specification . Thread, flow, and pressure data are nominal — confirm against your existing installation before ordering.

How It Works

The bypass filter draws a small side-stream of pressurized oil from the main hydraulic circuit. As oil passes through the M-E-X graded media:

1. M-series layer – absolute 3 µm filtration; β₃ > 400, capturing fine abrasive particles that cause wear

2. E-series layer – adsorbs sludge, varnish, and oxidation by-products

3. X-series layer – absorbs free and emulsified water (200–400 cc per element)

The cleaned oil returns to the reservoir, continuously upgrading overall system cleanliness to NAS 5–7 without interrupting operation.

Application Guidance

Deployed on:

• Injection moulding machines – continuous servo and proportional valve protection

• Die-casting and metal-working machines – bending, cutting, punching equipment

• Mobile hydraulic equipment – excavators, loaders, agricultural machinery

• All hydraulic systems with continuous pressure and fitted with proportional or servo-valves, and other high-tech hydraulic equipment

• Power units, circulation systems, gearboxes requiring sustained oil conditioning

Why Bypass Filtration Matters

⚠️ Impurities in the oil of hydraulic and lubrication systems cause up to 80 % of all machine breakdowns and production stops . A single 3 µm particle can score a servo valve spool; varnish deposits insulate heat exchangers and cause sticking; free water promotes microbial growth and corrosion. Bypass filtration attacks all three simultaneously — extending oil life, protecting precision components, and eliminating unplanned downtime.

Fluid Compatibility

• Mineral hydraulic oil (ISO HM, HV)

• Synthetic hydraulic fluids – coated housing version available for water-glycol (WG) service with dedicated WG elements

• Engine and circulating lube oil

• Phosphate-ester fluids – consult factory for media compatibility

Installation & Service

1. Tap a 1/4″ BSPT take-off from the high-pressure line (BU30E) or 1/4″ × 3/8″ BSPT (BU50E); connect the bypass filter inline.

2. Confirm system pressure is within 10–350 bar range.

3. Mount the housing securely; ensure the gauge is visible for ΔP monitoring.

4. Start the system; verify oil flow through the bypass unit.

5. Monitor the gauge: when ΔP reaches 4.5 bar, the relief valve opens — this signals element replacement.

6. Swap the element (TR-19450 for BU30E; TR-19650 for BU50E) without shutting down the main system.

7. Typical element service life: ~2,600 operating hours; 2–3 elements per year under normal duty .

8. Elements are disposable — the depth-media cartridge cannot be effectively cleaned; always replace with new.

Ordering

Specify the housing and element model together:

• BU30E + TR-19450 – 1.0 L/min flow, 30-size element, for smaller hydraulic circuits

• BU50E + TR-19650 – 1.5 L/min flow, 50-size element, for medium hydraulic circuits

Provide:

• Host machine model and hydraulic system pressure

• Required flow rate (1.0 or 1.5 L/min)

• Fluid type (mineral oil / synthetic / water-glycol / phosphate-ester)

• Required cleanliness target (NAS 5–7 standard)

• Thread specification (1/4″ × 1/4″ or 1/4″ × 3/8″ BSPT)

• Element media preference (M / E / X / combo)

Custom configurations and coated WG-compatible housings are available on request. Provide the existing element's dimensions or host machine model for cross-reference confirmation.

All values nominal; BU30E pairs with TR-19450 (1.0 L/min, 30-size M-E-X element, 1/4″×1/4″ BSPT, die-cast aluminum, 2.5 kg) and BU50E pairs with TR-19650 (1.5 L/min, 50-size M-E-X element, 1/4″×3/8″ BSPT, stainless steel coated, 4 kg) . Both housings operate at 10–350 bar system pressure, 450 bar max., with relief valve opening at 4.5 bar ΔP . Bypass filtration removes solid particles, sludge, varnish, and water — achieving NAS 5–7 cleanliness and reducing machine breakdowns caused by oil contamination (up to 80 % of all failures) . Typical element life ~2,600 hours; 2–3 replacements per year; replacement possible without system shutdown. Coated housing and WG-specific elements available for water-glycol fluids. Elements are disposable.