Inpro/Seal / Dover Precision Components Permanent Bearing Isolators and Shaft Seals

Inpro/Seal / Dover Precision Components permanent reliability solutions: VB45-S and VB45-U non-contacting bearing isolators, mini66 motor isolators, Air Mizer positive-purge shaft seals, CDR current diverter rings, and Sentinel FBS steam turbine seals.

Non-Contacting Bearing Isolators Inpro/Seal VB45-S and VB45-U

Non-contacting compound labyrinth isolators VB45-S and VB45-U deliver IP66 bearing protection. Stator and rotor form an engineered compound labyrinth with XX Interface and VBX vapor blocking ring. The design permanently eliminates lubrication loss and contamination in pumps and gearboxes.

Patented XX Interface and VBX ring prevent vapor and moisture transfer
Compact overall axial length of 15.88 mm fits standard industrial pump housings
VB45-U universal configuration accommodates axial shaft float up to 6.35 mm
Precision machined in bearing bronze, 316 stainless steel, and aluminum

Compact Motor Bearing Isolators Inpro/Seal mini66 Series

Compact mini66 series bearing isolators are engineered specifically for grease-lubricated electric motors. Unitized rotor and stator design provides IP66 protection within an ultra-narrow envelope. The assembly permanently retains grease in the housing and prevents shaft grooving.

Internal profile optimized specifically for grease-lubricated motor bearings
Standard IP66 ingress protection rating in an ultra-compact seal footprint
True non-contacting operation with zero friction, power loss, or shaft wear
Direct drop-in upgrade for standard elastomeric lip seals without shaft machining

Non-Contacting Positive-Purge Shaft Seals Inpro/Seal Air Mizer

Air Mizer non-contacting shaft seals are built for powder, slurry, and bulk solid process equipment. The system utilizes a positive air or inert gas purge to create an impenetrable barrier. The articulating design dynamically accommodates radial run-out, angular misalignment, and thermal growth.

Continuous positive-purge barrier using plant air or nitrogen at low flow rates
Full shaft articulation follows dynamic deflection without loss of sealing
CEMA compliant models custom-tailored for screw conveyor troughs and flanges
Heavy Duty AM construction for high-torque agitators, blenders, and reactors

Shaft Grounding Rings Inpro/Seal CDR and Smart CDR for VFD Motors

CDR shaft grounding rings protect motor bearings from electrical discharge machining caused by variable frequency drives. Bundles of conductive microfibers provide a low-impedance path to divert stray shaft voltages. The system eliminates fluting, frosting, and catastrophic bearing failures.

Diverts high-frequency stray shaft currents safely to ground around bearings
Proprietary conductive filaments provide full 360-degree circumferential contact
Split-ring design enables fast retrofit installation without decoupling drive
Smart CDR version incorporates an integrated sleeve for severe environments

Steam Turbine Floating Brush Seals Inpro/Seal Sentinel FBS Series

Sentinel FBS floating brush seals are designed for general purpose and process steam turbines. Densely packed flexible metallic bristles form a compliant dynamic shaft seal. The split design is a drop-in upgrade for fragile carbon rings, significantly reducing maintenance downtime and steam losses.

Drop-in replacement for brittle carbon ring packings in Elliott and OEM turbines
Extends turbine overhaul and maintenance intervals from months to 3-4 years
Split self-centering cartridge installs without casing modifications or rotor pull
Dramatically curbs steam leakage and prevents condensate ingress into bearing oil

Severe-Duty Bearing Isolators Inpro/Seal VB45-PB and VBXX-D Series

VB45-PB and VBXX-D series isolators are built for pillow block housings, heavy gearboxes, and paper machine rolls. The design withstands continuous water washdown, oil mist, and flooded lubrication environments. Advanced drain ports and specialized contours eliminate overheating and oil leakage.

Custom profiled to fit split pillow block bearing housings without remachining
Engineered for pure oil mist, purged oil mist, and fully flooded bearing sumps
High resistance to aggressive CIP chemicals and high-pressure hose washdown
Extends bearing life on heavy mining conveyors, pulverizers, and pulp equipment

Non-Contacting Bearing Isolators VB45: Compound Labyrinth Operation

Inpro/Seal VB45-S and VB45-U bearing isolators feature a precision-machined rotor and stator forming a permanent non-wearing compound labyrinth. Centrifugal force expels external liquids and dust into an outer containment chamber, draining them away through the bottom port by gravity.

The VBX vapor blocking ring and XX Interface prevent ambient moisture from transferring into the bearing housing during thermal cycling when rotating machinery shuts down.

Electric Motor Bearing Protection: mini66 Series Grease Retention

Grease-lubricated electric motors require permanent retention of lubricating grease within the cavity without leakage along the rotating shaft. The mini66 series isolator features optimized internal D-grooves and dynamic fluid channels that effectively lock grease inside the housing.

Ultra-compact axial dimensions fit standard motor end-bell seal bores directly, delivering IP66 environmental protection without costly mechanical machining.

Air Mizer Positive-Purge Shaft Seals: Dynamic Articulation and Containment

Process agitators, mixers, and screw conveyors frequently subject shafts to extreme radial run-out, angular deflection, and thermal expansion.

Inpro/Seal Air Mizer shaft seals utilize a continuous positive air or inert gas purge slightly above process pressure to establish an impenetrable fluid barrier. Fully articulating stator components follow dynamic shaft movement without binding, wear, or loss of positive sealing integrity.

Mitigating Bearing Electrical Erosion: CDR Shaft Grounding Rings

Variable frequency drives induce high-frequency stray shaft voltages that discharge through motor bearings via electrical discharge machining. Inpro/Seal CDR and Smart CDR current diverter rings provide a low-impedance path to divert harmful currents safely from the shaft directly to ground.

This proprietary conductive microfiber technology eliminates bearing fluting, pitting, and catastrophic motor breakdown on inverter-driven machinery.

Steam Turbine Efficiency Upgrade: Sentinel Floating Brush Seals

Conventional segmented carbon rings in process steam turbines wear rapidly, causing severe steam leakage, high boiler costs, and water contamination of bearing oil.

Sentinel FBS floating brush seals utilize high-density compliant metallic bristles that bend safely during transient thermal growth and rotor vibrations. The split cartridge drops directly into existing carbon ring glands without casing modifications or rotor lifting.

Severe Washdown Environments: VB45-PB Pillow Block Protection

Industrial equipment in mining, pulp processing, and food packaging undergoes high-pressure washdown with harsh chemical cleaning agents. Inpro/Seal VB45-PB and VBXX-D heavy-duty bearing isolators integrate robust external deflector shrouds that deflect direct high-velocity hose jets.

Internal labyrinth channels capture and expel any ingress, ensuring long-term bearing reliability on heavy conveyor pulleys and refining rolls.

Inpro/Seal / Dover Precision Components and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of Inpro/Seal / Dover Precision Components and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.