Hydraulic Oil Filter Housings & Precision Elements – Models BU300E (TR-19320) · BU100EW (TR-19550)

BU300E is a high-capacity bypass filtration housing for mineral and synthetic hydraulic oil, paired with the TR-19320 precision element. BU100EW is the water-glycol (HFC) dedicated variant, paired with the TR-19550 element. Both units connect directly to the high-pressure line — no motor, no pump — and perform continuous total-fluid purification by removing solid particles, sludge, varnish, and free water. Over 80 % of all machine breakdowns and production stops originate from oil contamination ; these bypass filters dramatically reduce failure rates and extend fluid service life.

Key Features

• Bypass filtration, no auxiliary power – operates at 10–350 bar system pressure; max. pressure 450 bar

• Patented micro-filtration media – BU300E uses 100-size M-E-X-D-WE elements; BU100EW uses WG100 / DWG100 water-glycol elements

• Full contaminant removal – solid particles + sludge + varnish + water, simultaneously

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

• Stainless steel coated housing – corrosion-resistant for both mineral oil and HFC service

• Bypass-free element change – swap the cartridge without shutting down the main system

• Disposable deep-bed cellulose cartridge – cannot be effectively cleaned; replace at service interval

Technical Specifications

Source: manufacturer bypass filtration specification . All values nominal — confirm against your existing installation before ordering.

Element Technology

TR-19320 (BU300E) – Houses three 100-size elements from the M-E-X-D-WE platform, each ∅179 × H114 mm :

• M-series – absolute 3 µm filtration; captures fine abrasive particles that cause wear

• E-series – adsorbs sludge, varnish, and oxidation by-products

• X-series – absorbs free and emulsified water

• D / WE – extended dirt-holding capacity and high-viscosity variants

TR-19550 (BU100EW) – WG100 / DWG100 water-glycol elements, ∅179 × H114 mm :

• WG100 – 2 µm absolute, two-stage build with M-filter medium at the upper part and X-filter medium at the lower part, separated by a non-woven disc to protect the lower part in case of excessive water

• DWG100 – 10 µm + 5 µm two-stage build, separated by a non-woven disc for additional particle removal

How It Works

The bypass filter draws a small side-stream of pressurized fluid from the main hydraulic circuit. As fluid passes through the element:

1. Upper stage – largest particles trapped; smaller contaminants captured in the low-density section, avoiding premature clogging

2. Lower compressed stage – finer final filter medium captures sub-micron particles

3. Absorption – special cellulose material absorbs water and sludge through its thickness

⚠️ TR-19550's two-stage M + X architecture with non-woven disc separator is mandatory for HFC service. Water-glycol fluids contain 35–50 % water by weight; standard mineral-oil elements will saturate and fail. Never substitute a standard element in BU100EW.

Application Guidance

BU300E / TR-19320 – Deployed on:

• Large hydraulic power units and reservoirs requiring 6 L/min bypass flow

• Injection moulding machines, die-casting, metal-working, and mobile hydraulic equipment

• Systems with proportional or servo-valves demanding high oil cleanliness

• BU100/200/300E, SE100 up to SE600, AL100, OSCA AL-series SU/SS102, SU/SS103 filter systems

BU100EW / TR-19550 – Deployed on:

• Water-glycol (HFC) hydraulic systems in steel mills, foundries, and high-temperature environments

• BU100/200/300EW, SE100WG up to SE600WG, AL100WG, OSCA AL-WG series SU102, SU103 filter systems

• Fire-resistant fluid circuits where HFC fluids are mandated

Fluid Compatibility

• Mineral hydraulic oil (ISO HM, HV) – BU300E

• Synthetic hydraulic fluids – BU300E

• Water-glycol (HFC) – BU100EW exclusively; TR-19550 elements engineered for HFC

• Phosphate-esters (HFDR) – consult factory for media compatibility

Installation & Service

1. Tap the specified BSPT take-off from the high-pressure line; connect the bypass filter inline.

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

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

4. Start the system; verify fluid 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(s) 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 — always replace with new.

Ordering

Specify the housing and element model together:

• BU300E + TR-19320 – 6.0 L/min flow, three 100-size M-E-X-D-WE elements, for large hydraulic reservoirs

• BU100EW + TR-19550 – 1.5 L/min flow, single WG100 / DWG100 element, for water-glycol (HFC) service

Provide:

• Host machine model and hydraulic system pressure

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

• Required flow rate (6.0 L/min or 1.5 L/min)

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

• Element media preference (M / E / X / D / WE / WG100 / DWG100)

All values nominal; BU300E (TR-19320) delivers 6.0 L/min bypass flow with three 100-size M-E-X-D-WE elements at 1/4″×3/8″ BSPT, stainless steel coated, 12 kg, 24×24×77 cm . BU100EW (TR-19550) delivers 1.5 L/min with a single WG100 (2 µm absolute) or DWG100 (10+5 µm two-stage) element at 1/4″×1/4″ BSPT, stainless steel coated, 6.5 kg, 23×17×32 cm . Both housings operate at 10–350 bar system pressure, 450 bar max., relief valve at 4.5 bar ΔP . Elements are ∅179 × H114 mm, disposable, replaceable without system shutdown. WG elements feature two-stage M+X media with non-woven disc separator, purpose-built for water-glycol service .