Submersible drainage and slurry pumps Grindex

Industrial submersible drainage and slurry pumps Grindex (Sweden): Minex, Major, Salvador sludge pumps, Bravo slurry series, stainless Inox, and Plug-In shaft seals.

Submersible drainage dewatering pumps Grindex Minex, Minor, Major, and Master

Submersible drainage pumps Grindex are engineered for demanding dewatering duties across building construction sites, open quarries, and tunneling projects. The pump features a patented air valve for safe dry running, durable shaft sealing, and a SMART electronic surveillance module.

Patented air cooling valve enables extended dry running without motor damage
Pumping heads from 15 to 200 meters with delivery rates up to 350 liters per second
Handling abrasive suspended solids up to 12 mm across open drainage impellers
Hydraulic wet end constructed from wear-resistant Hard-Iron alloy and polyurethane

Submersible sludge pumps Grindex Solid, Salvador, and Sandy with vortex hydraulics

Submersible sludge pumps Grindex are designed to handle heavily contaminated water laden with mud, sludge, and sediment. The recessed vortex impeller creates an unobstructed flow path that minimizes contact between solids and vanes, reducing component wear and preventing blockages.

Spherical clearance for solid objects and fibrous debris up to 80 mm in diameter
Vortex hydraulic design avoids clogging while maintaining continuous suction flow
Smart electronic module monitors internal motor temperature and phase symmetry
Replaceable wear plates and polyurethane rubber liners protect internal components

Heavy-duty slurry pumps Grindex Bravo with integrated agitator for abrasive media

The Grindex Bravo pump series is engineered for severe duties involving high-density abrasive slurries, bentonite drilling muds, mineral tailings, and quarry sand. An integrated shaft agitator continuously resuspends settled solids directly ahead of the suction intake for reliable transport.

Integrated mechanical agitator breaks up compacted sediments and heavy slurries
Large solid passage accommodates coarse abrasive stones up to 50 mm in size
Volute and hydraulic components manufactured from Hard-Iron alloy rated at 60 HRC
Low-speed submersible electric motor delivers powerful torque under dense loads

Stainless steel submersible pumps Grindex Inox for corrosive and acidic fluids

The Grindex Inox range is engineered for chemically demanding operating environments where corrosive fluids exhibit extreme acidity or alkalinity from pH 2 to pH 10. All wetted parts, including pump housing, impeller, and hardware, are fabricated from acid-proof stainless steel grade AISI 316.

Outstanding corrosion resistance in acidic mine drainage and industrial effluents
Specialized FKM Viton elastomers withstand aggressive chemicals and hot fluids
Available in both drainage and sludge hydraulic models for chemical applications
Dual mechanical shaft seals with silicon carbide rings run in an oil barrier bath

Mechanical cartridge shaft seal assemblies and hydraulic seal kits Grindex

Mechanical shaft seal units Grindex preserve hermetic isolation of the internal motor chamber under high hydrostatic submersion depth. The modular Plug-In cartridge design simplifies field maintenance, preventing misalignment of precision sliding faces and protecting secondary seals.

Sintered silicon carbide SiC friction faces provide extreme abrasion durability
Pre-assembled Plug-In cartridge architecture speeds up mechanical maintenance
Isolated intermediate oil reservoir equipped with an inspection plug for testing
High-grade NBR and fluoroelastomer secondary O-rings resist fluid degradation

Impellers, diffusers, sacrificial zinc anodes, and hydraulic wear components Grindex

Engineered hydraulic wear components Grindex are designed to extend service intervals of dewatering units operating under severe abrasive slurry conditions. The offering includes Hard-Iron impellers, adjustable discharge diffusers, suction wear plates, cable entries, and sacrificial zinc anodes.

High-chromium Hard-Iron impellers withstand prolonged hydro-abrasive impingement
Adjustable polyurethane diffusers restore design clearances without disassembly
Sacrificial zinc anodes provide electrochemical galvanic protection for housings
Water-tight cable entry glands with dual strain relief prevent moisture ingress

Engineering traditions and technical evolution of Grindex

The engineering heritage of Swedish pump maker Grindex originated in 1940 when engineers Börje Kristensson and Grähs established a specialized mechanical workshop near Stockholm.

Initially fabricating grinding machinery and Rockmaster rock drill sharpeners, the founders directly observed severe limitations in early submersible dewatering equipment, which suffered from excessive weight and burned out immediately when running without liquid.

The defining technical breakthrough arrived when Grindex invented and patented an air cooling valve that enabled submersible pumps to run dry without overheating. In 1960 the manufacturing base relocated to Haninge, initiating the commercial launch of the legendary Minor and Major lines.

Today Grindex belongs to Xylem Inc and is recognized as a global benchmark for mining and construction dewatering.

Air valve mechanism and unsupervised dry running protection

The primary operational distinction of Grindex submersible drainage units is the patented air cooling valve mechanism. When an excavation sump runs dry, ordinary submersible units overheat rapidly due to lost fluid heat transfer.

In Grindex pumps, the moment the liquid level falls below the suction inlet, the air valve opens automatically, drawing ambient air across the internal cooling jacket.

This induced convective airflow absorbs stator thermal buildup, enabling the unit to run dry for extended hours without requiring operator intervention.

Once ground water or runoff inflow returns, the valve closes under differential hydraulic suction, immediately restoring peak pumping flow without cavitation or thermal shock to the mechanical seals.

SMART electronic surveillance and motor health monitoring

Modern industrial Grindex pumps integrate the SMART electronic surveillance system, housed within a sealed internal chamber inside the pump structure.

This microprocessor unit provides comprehensive three-fold electrical protection: it continuously monitors stator thermal sensors, blocks motor startup under reversed phase rotation, and interrupts power during hazardous single-phasing or voltage asymmetry.

The built-in phase rotation correction automatically reconfigures electric drive rotation without manual wiring changes inside the terminal junction box.

During thermal overload or electrical voltage drops, the SMART system stops the motor, protecting internal stator windings from insulation breakdown and preserving bearing operating life.

Vortex hydraulic design and heavy slurry agitator assemblies

To pump thick slurries and abrasive sediments, Grindex employs two specialized hydraulic architectures. In the Salvador and Sandy sludge lines, a recessed vortex impeller is positioned deep within the volute chamber.

This vortex rotation creates a swirling hydraulic vortex that moves solids directly through the pump body without direct abrasive impact against impeller blades.

For heavy-density mineral tailings and drilling bentonite, the Bravo slurry pump series mounts a rugged Hard-Iron agitator directly onto the extended drive shaft.

During rotation, the agitator breaks up compacted mud and sand, creating a fluid slurry mixture and enabling smooth transport of dense media with specific gravity up to 1.8 kilograms per liter.

Modular cartridge shaft seals and Hard-Iron hydraulic alloys

Reliable motor chamber isolation under high hydrostatic submergence depth is provided by dual mechanical shaft seals operating within an oil reservoir. Grindex utilizes a modular Plug-In cartridge architecture where both seal assemblies are pre-aligned within a single unit.

The seal faces are fabricated from sintered silicon carbide, maintaining contact flatness under heavy friction.

The Plug-In cartridge slips smoothly into place, avoiding seal face misalignment or elastomeric damage during service overhauls. The oil chamber includes an external inspection plug for testing oil cleanliness.

Hydraulic wet end components are poured from high-chromium Hard-Iron alloy hardened to 60 HRC, resisting severe hydro-abrasive impingement.

Stainless steel Inox pump series for corrosive chemical duties

In mining leach plants, industrial metallurgy, and chemical processing facilities, drainage runoff often carries dissolved acids, metal salts, and aggressive sulfates.

For such demanding duties, Grindex developed the Inox pump series, where all metallic parts are manufactured from acid-proof austenitic stainless steel grade AISI 316. The units pump corrosive fluids spanning pH 2 to pH 10.

All internal O-rings, lip seals, and cable bushings in the Inox series are molded from FKM Viton fluoropolymers, resisting chemical degradation when exposed to hot acidic mixtures and petroleum oils.

The Inox family is available in both drainage and vortex sludge models, delivering reliable dewatering across harsh chemical environments.

Grindex 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 Grindex and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.