Tobee® THR 6/4D Rubber Lined Pump
When you're moving corrosive, fine-particle slurry day after day, the pump you choose either protects your uptime or quietly eats into it. The Tobee® THR 6/4D Rubber Lined Pump was built for exactly this kind of duty: a heavy-duty rubber lined centrifugal slurry pump engineered to handle abrasive, corrosive slurries without the constant liner replacements that metal-lined pumps demand in the same service.
You'll find this pump doing its job in flotation circuits, tailings lines, phosphate and fertilizer plants, and acid slurry duties where fine solids and chemical attack wear down ordinary pumps fast. As a rubber lined slurry pump, its wetted parts are molded from natural rubber compounded specifically for abrasion and chemical resistance, giving you longer liner life and fewer unplanned shutdowns than a standard high-chrome pump would in the same fine-slurry, corrosive application.
The THR 6/4D is dimensionally and functionally interchangeable with the standard THR / AHR 6/4D pump, so if you're already running other brand equipment, you can drop this in — or use it as your spare parts source — without redesigning your piping, baseplate, or drive arrangement. Tobee® builds it to the same footprint, the same bolt pattern, and the same performance envelope, and backs it with OEM and custom manufacturing support for operators who need something slightly outside the standard catalog.
Why Operators Choose This Pump
You don't buy a slurry pump on looks — you buy it because it keeps running when the slurry gets nasty. Here's what you're actually getting with the THR 6/4D:
Heavy-duty rubber lined construction — natural rubber wet end resists fine-particle erosion better than metal in low-sharp-edge, high-corrosion duties.
Full interchangeability with the original AHR 6/4D pump — same envelope dimensions, same mounting, drop-in replacement parts.
High hydraulic efficiency across the working range, so you're not paying for wasted kilowatts.
Easy maintenance — bolted (not glued) liners and a cartridge-style bearing assembly that lets you adjust impeller clearance from outside the casing.
Flexible wet-end options — rubber, natural rubber blends, or metal liners in the same casing, depending on how your slurry changes over time.
OEM and ODM manufacturing available if your operation needs a modified design, branding, or documentation package.
If you're comparing pumps and searching for the best rubber lined pump for a fine, corrosive slurry duty, the deciding factor usually comes down to wear life per dollar — and that's where a well-compounded rubber liner earns its keep over a season of continuous operation.
Technical Specifications
Performance depends on impeller trim, speed, and specific gravity of your slurry, so treat the figures below as the typical operating window for this frame size rather than a single fixed rating. Send us your flow, head, and slurry data and we'll confirm the exact duty point for you.
| Item | Value |
| Pump Model | THR 6/4D |
| Pump Type | Horizontal, cantilevered, centrifugal rubber lined slurry pump |
| Suction Size | 6 inch (150 mm) |
| Discharge Size | 4 inch (100 mm) |
| Capacity Range | 144-324 m³/h |
| Total Head Range | 12-45 m |
| Speed Range | 800-1350 rpm |
| Max. Efficiency | Up to 65% |
| NPSHr | 3-5 m |
| Max. Particle Size | ≤ 33 mm (fine slurry, no sharp edges) |
| Max. Motor Power | Up to 60 kW |
| Liner Material | Natural rubber (chloroprene / wear-resistant compounds available) |
| Impeller Material | Molded natural rubber |
| Shaft Seal | Packing gland seal / expeller seal / mechanical seal |
| Drive Types | Direct coupling, V-belt drive, gearbox reducer |
The curve shows where the THR 6/4D runs at its best efficiency point rather than just its maximum rated flow. Running a slurry pump too far off its BEP is one of the most common — and most avoidable — causes of premature liner wear and vibration. When you tell us your required flow and head, we size the impeller trim so your duty point sits close to the middle of the efficiency curve, not out on its edge, which is the single biggest thing you can do to stretch liner life between rebuilds.
| Component | Standard Material | Alternative Options |
| Impeller | Natural rubber | Chloroprene rubber, high-chrome alloy |
| Volute Liner | Natural rubber | Wear-resistant synthetic rubber |
| Frame Plate Liner | Natural rubber | Polyurethane, high-chrome alloy |
| Cover Plate / Casing | Ductile iron | Grey cast iron |
| Shaft | Alloy steel | — |
| Bearing Assembly | Heavy-duty grease-lubricated | Oil-lubricated for high-load duty |
This is the question almost every buyer asks, and the honest answer is that it depends on particle size, not just abrasiveness. Rubber for pumps performs best when the solids in your slurry are fine — generally under 10 mm, without sharp, angular edges — because rubber deflects and resists cutting wear from small particles far better than metal does. Once particle size climbs past that range, or the slurry carries sharp, angular material, high-chrome liners start to outperform rubber. If your slurry is fine, corrosive, and slow to settle — think flotation tailings, phosphate slurry, or acid process water — rubber is usually the more economical choice over the life of the pump.
Why Choose a Rubber Lined Pump for This Duty?
A rubber lined slurry pump earns its keep in a fairly specific but common set of conditions, and it's worth checking your application against this list before you commit:
Compared with metal slurry pumps rubber lined slurry pumps hold up better against corrosion and fine-particle abrasion, and because the rubber liner absorbs impact rather than being cut by it, you typically get a longer service interval and lower total operating cost in these fine-particle applications. That's the core reason mining and mineral processing operators keep specifying rubber lined pumps and rubber slurry pumps for this segment of their circuit, even when a metal-lined pump costs less upfront.
Typical Applications
You'll see the THR 6/4D rubber-lined centrifugal slurry pump working across a fairly wide industrial footprint: gold and copper mining, coal washing and tailings handling, flotation circuits, chemical plants, flue-gas desulfurization (FGD) systems, general mineral processing, sand washing, power plant ash handling, wastewater treatment, and paper mill process lines. If your slurry is fine, abrasive, and even mildly to moderately corrosive, there's a good chance this pump — or a close variant of it — is already running in a plant doing something similar to what you're planning.
Compatible Parts & Interchangeability
The THR 6/4D is built to be compatible with the Warman® AHR 6/4D pump, matching its casing dimensions, bolt circle, and shaft configuration. That means you can source replacement wet-end parts from Tobee® without re-engineering your existing installation.
Replacement parts available include:
OEM part numbering cross-referenced to your existing pump documentation is available on request — send us your current part tags or drawings and we'll confirm fitment before you order.
Manufacturing Process
Each stage is inspected before the part moves to the next, so problems get caught at the casting or machining stage rather than after the rubber has already been molded onto a faulty liner.
Every THR 6/4D that leaves the factory goes through raw material inspection, rubber hardness testing, dynamic balance testing on the impeller and shaft assembly, hydrostatic pressure testing on the casing, a full performance test against the curve, and a final packing inspection before it's crated. This isn't a marketing checklist — it's the same sequence our quality team runs on every batch, and we can provide inspection reports and test certificates alongside your shipment if your project requires them.
Pumps are packed in wooden cases or plywood boxes built to export standard, sized and braced for container loading. We ship worldwide and can arrange documentation for customs clearance in most destination countries — let us know your port and Incoterms preference when you request a quote.
Why Choose Tobee®
You have plenty of rubber lined pump manufacturers to choose from, so here's what actually separates Tobee® from a catalog listing:
If you're evaluating rubber lined pump manufacturers for a new project or a maintenance contract, ask any of them for a documented case history in your specific slurry type — that answer tells you more than any spec sheet will.
Yes. The Tobee® THR 6/4D matches the Warman® AHR 6/4D in casing dimensions, mounting, and wet-end fitment, so it can be installed as a direct replacement or run alongside Warman equipment using the same spare parts.
Fine, corrosive, or chemically aggressive slurries with particles generally under 10 mm and without sharp, angular edges. Acid slurry, phosphate, flotation tailings, and similar fine-particle duties are typical fits.
Around 10 mm for rubber-lined wet ends. Larger or sharper-edged solids wear rubber liners faster and are usually better served by a metal-lined equivalent, like the TH series.
Service life depends heavily on slurry concentration, particle size, and duty point, so we can't quote a single number honestly — but in a properly sized fine-slurry application, rubber liners commonly outlast metal liners several times over in corrosive, non-abrasive-edge service.
Packing gland seals are the simplest and lowest-cost option for less critical duties. Expeller seals work well where you can tolerate some air ingestion and want to avoid seal water. Mechanical seals are the right call when you need a fully sealed, low-leakage system, particularly on corrosive or environmentally sensitive slurries.
Yes, OEM and ODM manufacturing is available, including custom branding, modified dimensions, and documentation packages built to your specification.
Yes. Rubber impellers, volute liners, frame plate liners, shaft sleeves, expellers, mechanical seals, and bearing assemblies are all available as standalone spare parts.
Natural rubber is standard, with chloroprene rubber and other wear-resistant synthetic compounds available depending on your slurry's chemistry and temperature.
Pump selection starts with three numbers: your required flow rate, total dynamic head, and slurry specific gravity. Send us those figures along with particle size and pH, and we'll confirm whether the THR 6/4D is the right frame size or recommend an alternative.
Mining and mineral processing, coal washing, chemical processing, phosphate and fertilizer production, power plant FGD systems, and wastewater treatment are the most common.
Request a Quote for the Tobee® THR 6/4D Rubber Lined Pump
Running a mining or industrial application that needs a dependable rubber lined pump for sale? Tell us your flow, head, and slurry characteristics, and we'll come back with a duty point recommendation, not just a price list.
Contact Tobee® today for competitive factory pricing, OEM and custom manufacturing, technical pump selection support, spare parts availability, and fast global delivery. Our engineers will recommend the pump configuration that actually fits your operating conditions, based on your slurry's particle size, concentration, and corrosivity — not a generic catalog match.
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Tobee is specialized in providing solutions for slurry pump, vertical sump pumps, gravel pump, dredging pumps, froth pump, seawater pumps, fire pumps, slurry pump parts and OEM pump parts for your harsh projects.
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+86 180 3203 4573
+86 311 8722 1317
No. 266, Tianshan St, High-tech Zone, Shijiazhuang City 050000, China.
