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Haight Rotary Gear Pumps — Hot Oil & Industrial PD Pumps
Haight Rotary Gear Pumps
Positive-Displacement Pumps That Perform
Built by Haight Pump, a division of Baker Manufacturing — the same family as Baker Water Systems. Rugged internal-gear positive-displacement pumps for hot cooking oil, lubrication, fuel transfer, and viscous process fluids. Sized roughly 1 to 240 US gpm, with pressures to 600 psi and high-temperature builds.
Haight Pump is a division of Baker Manufacturing Company of Evansville, Wisconsin — the same long-established manufacturer behind the Baker Water Systems line we already carry. Since 1972, Haight has specialized in one thing and done it exceptionally well: rugged, reliable rotary gear pumps for moving difficult, viscous, and high-value fluids.
These are positive-displacement internal gear pumps — a fundamentally different machine from the centrifugal and submersible water pumps that make up most of our catalog. Where a centrifugal pump spins water, a Haight gear pump captures and carries a fixed volume of fluid with every revolution, delivering steady flow against pressure even with thick oils and lubricants. Haight's flagship reputation was built in hot cooking oil filtration for commercial kitchens, and the same core design now serves lubrication, fuel transfer, chemical, and industrial process duty worldwide.
What Is a Haight Pump?
A positive-displacement internal gear pump — not a centrifugal. Understanding the difference is the key to knowing where Haight fits.
A Haight pump uses two meshing gears inside a precision housing. As the gears turn, fluid is trapped between the gear teeth and the casing, carried around, and pushed out the discharge. Because a fixed volume moves with every revolution, flow stays nearly constant regardless of discharge pressure — and unlike a centrifugal pump, performance actually improves as the fluid gets thicker. That makes gear pumps the right tool for oils, lubricants, fuels, adhesives, and other viscous media that centrifugal pumps handle poorly.
Haight builds its pumps around an involute internal-gear design (the larger sizes use a "gear-within-a-gear" geometry for quiet, smooth flow), housed in ductile iron, running on self-lubricating grammix iron sleeve bearings with no ball bearings to fail. Pumps run at standard motor speeds with no pulleys or gear reducers, and close-couple directly to NEMA-frame motors on bolt-on brackets that eliminate shaft alignment and shimming.
| Characteristic | Centrifugal Pump (Goulds, Flygt, Godwin) | Haight Gear Pump (Positive Displacement) |
|---|---|---|
| Flow vs Pressure | Flow falls as pressure rises | Near-constant flow regardless of pressure |
| Best Fluids | Thin, clean, water-like liquids | Viscous fluids — oils, fuels, lubricants, adhesives |
| Effect of Viscosity | Efficiency drops sharply | Efficiency and sealing improve |
| Self-Priming | Generally no | Yes |
| Metering / Dosing | Imprecise | Precise — volume per revolution |
| Typical Duty | Water transfer, circulation, dewatering, wastewater | Oil and fuel transfer, lubrication, filtration, injection |
Where Haight Fits in the Pump Market
A specialist line, not a generalist. Haight owns a niche and extends into broad industrial fluid handling.
The flagship market is hot cooking oil. For more than fifty years Haight has been a recognized leader in pumps for filtering and transferring hot frying oil in commercial kitchens — fast food, casual and family restaurants, bakeries, donut and snack producers, and oil rendering. The E-Series is NSF approved and found in hundreds of thousands of foodservice installations worldwide. If a customer needs to move or filter hot oil, Haight is a first-call brand.
The broader market is industrial viscous-fluid handling. The same gear-pump platform — under the DIU "Universal" series — covers lubrication systems, fuel and bulk transfer, filtration, refrigeration, chemical and polymer injection, marine, paper, mining, and API-type petroleum service. With material and seal options for temperatures to roughly 625°F and pressures to 600 psi, Haight reaches duties that standard water pumps cannot touch.
For Watermain Supply, Haight is an industrial line, not a waterworks line. It complements rather than competes with our Xylem, Goulds, and Flygt centrifugal pumps — different fluids, different physics, different customers. It shares a manufacturer with our Baker Water Systems products, and it points squarely at the industrial process market.
The Haight Product Range
From a 1 gpm hot-oil pump to a 240 gpm bulk-transfer unit — one gear-pump platform, many configurations. All DIU-series pumps are interchangeable with earlier Haight D & DR series.
E & G Series
Hot Cooking Oil — NSF Approved
The flagship foodservice line, proven since 1972. Compact, durable, NSF-approved gear pumps for filtering and transferring hot frying oil. Motor options with UL, CSA, or CE approval; RoHS compliant. A selection of internal gear designs tuned to specific operating characteristics.
Sizes
- E-Series: 1, 3, 5, 6, 7, 8, 9 gpm
- G-Series companions (6G, 8G)
- Additional sizes available up to 80 gpm
Typical ApplicationsFryer oil filtration and transfer in fast food, restaurants, bakeries, donut and snack production, and oil rendering.
DIU Series — Round Hub
Compact Industrial Transfer & Lube
Seven sizes of the "Universal" gear pump for close-coupled or direct motor mounting. Involute gear design for excellent suction and low bypass, grammix iron bearings, and Buna-N lip seals in the quick-change UniverSeal design. Optional bolt-on relief valve, return-to-suction or return-to-tank.
Sizes
- 1, 3, 5, 6, 7, 8, 9 gpm
- Optional materials to ~620°F and 600 psi
Typical ApplicationsLubrication, fuel systems, filtration, transfer of oils and viscous fluids.
DIU Series — Square Flange
Mid-Flow Industrial Gear Pumps
Six sizes in the square-flange configuration with bolt-on relief valve and field-reversible seal vent. NEMA-matched footed brackets eliminate pump/motor shimming. Optional bearing and seal materials for high-temperature and high-pressure service.
Sizes
- 10, 15, 20, 24, 30, 40 gpm
- Optional materials to ~625°F and 600 psi
Typical ApplicationsLubrication, fuel and bulk transfer, machine-tool coolant, process fluids.
DIU Series — Double Pumps
Two Pumps, One Compact Unit
Five sizes of dual-pump assemblies for high combined flow in a compact, low-shear, low-noise package. Close-coupled to eliminate gearboxes and coupling alignment. 300# ANSI flange and NPT connections, reversible flow, ductile-iron construction.
Sizes
- 44, 54, 60, 70, 80 gpm
- Multiple seal, bearing, and rotor material options
Typical ApplicationsDual-circuit lubrication, simultaneous transfer/return, compact high-flow duty.
DIU Series — Large Flow (US)
Bulk Transfer — Up to 240 gpm
The large-flow extension of the Universal design, using a quiet "gear-within-a-gear" internal geometry. Close-coupled direct drive to 1800 rpm, 250 psi discharge capability, and 300# ANSI inlet/outlet flanges. Fewer moving parts for reduced maintenance and wear.
Sizes
- 120, 180, 240 gpm
- Additional sizes and flow rates on request
Typical ApplicationsPetroleum and fuel bulk transfer, food processing, soap and detergent, paper, shipbuilding, mining.
Configuration & Options
Built to the Fluid, Not Off the Shelf
Nearly every Haight pump can be configured for the fluid and duty. We help match elastomers, rotor, bearings, seal type, and drive to your application.
Common Options
- Elastomers: Buna, Neoprene, Viton, EPDM, Silicone, Teflon, Kalrez
- Rotor: iron, Delrin, PTFE Teflon
- Bearings: grammix iron, bronze, CG, Vespel
- Seals: lip, mechanical (Type 21/2B/2), or magnetic-drive sealless
- Integral relief valve, tang shaft, extra-hard build
NoteHigh-temperature, corrosion-resistant, and spark-resistant builds available — consult us with your fluid data.
Capabilities & Specifications
Range across the full Haight gear-pump platform. Exact ratings depend on model, materials, and configuration — confirm at time of quote.
| Parameter | Range / Specification |
|---|---|
| Pump Type | Rotary internal gear, positive displacement |
| Flow Range | ~1 to 240 US gpm (additional sizes on request) |
| Discharge Pressure | Up to 600 psi (model and configuration dependent; large-flow to 250 psi) |
| Fluid Temperature | Up to ~625°F (330°C) with high-temperature materials |
| Drive | Direct / close-coupled at standard motor speeds, to 1800 rpm |
| Housing | Ductile iron (Ductile 65) |
| Gears | #1215 steel pinion and hardened polished shaft; #30 iron rotor (Delrin / PTFE optional) |
| Bearings | Self-lubricating grammix iron sleeve (bronze, CG, Vespel optional) |
| Seals | Buna-N lip seal in UniverSeal design; mechanical (Type 21/2B/2); magnetic-drive sealless option |
| Elastomers | Buna standard; Neoprene, Viton, EPDM, Silicone, Teflon, Kalrez |
| Ports / Flanges | 3/4 in NPT (small frames); 300# ANSI flange plus NPT (large-flow and double pumps) |
| Relief Valve | Optional bolt-on, return-to-suction or return-to-tank, to 230 psi |
| Approvals | NSF (E-Series); motor options UL / CSA / CE; RoHS compliant |
| Legacy Interchange | DIU series interchangeable with earlier Haight D & DR series |
Construction & Engineering Features
The design choices that make a Haight pump rugged, serviceable, and easy to mount.
Positive-Displacement Gear Design
Involute internal gears (gear-within-a-gear on large sizes) deliver steady flow against pressure, excellent suction, and low internal bypass — ideal for viscous fluids.
Direct / Close-Coupled Drive
Runs at standard motor speeds with no pulleys or gear reducers. Bolt-on NEMA-matched brackets eliminate shaft alignment, shimming, and coupling failures.
UniverSeal Seal System
Buna-N lip seal in a quick-change UniverSeal housing — simple, fast field replacement, or swap to an alternate seal type without redesign.
Grammix Iron Bearings
Self-lubricating sleeve bearings mean no ball bearings to fail and no alignment or tolerance-stacking issues — fewer wear points, longer life.
Ductile Iron Construction
Rugged Ductile 65 iron housing with steel shaft and pinion for cost-effective, durable service in demanding industrial duty.
Optional Relief Valve
Bolt-on integral relief valve, field-convertible between return-to-suction and return-to-tank, protects the pump and downstream system.
Wide Material & Seal Options
Viton, Teflon, Kalrez, EPDM elastomers; Delrin/PTFE rotors; bronze/Vespel bearings; mechanical or sealless magnetic drive for aggressive or high-temperature fluids.
Legacy Interchange
DIU "Universal" pumps drop in for earlier Haight D & DR series — a straightforward replacement path for existing installations.
Applications by Industry
Where Haight gear pumps earn their reputation. Match your fluid and duty to the right series — call us for application-specific selection.
| Industry | Typical Haight Applications | Suggested Series |
|---|---|---|
| Foodservice / Commercial Kitchens | Hot cooking-oil filtration and transfer, fryer oil handling | E & G Series (NSF) |
| Industrial Lubrication | Gearbox, compressor, conveyor, generator and CNC lube; lubricant cooling and filtration | DIU Round Hub / Square Flange |
| Fuel & Fueling | Fuel transfer, bulk transfer, engine and remote fuel systems, aircraft and portable refueling | DIU Square Flange / Large Flow |
| Filtration Systems | Transformer oil, cooking oil, fuels, hydraulic fluids, machine-tool coolants | DIU + high-temp configs |
| Refrigeration | Compressor lubrication, liquefied-refrigerant circulation | DIU + custom seals |
| Chemical & Process | Soap, detergent, rubber, tanning, textile, plastics; adhesive, resin, polymer and foam injection | DIU + material options |
| Marine | Engine and drivetrain lube, fuel load/unload, bilge scavenging, washdown, fish-processing waste | DIU + corrosion-resistant build |
| Petroleum / API-Type | Tank-battery circulation, sampling and LACT systems, intermediate-pressure pipeline transfer | Large Flow (US) Series |
| Paper / Mining / Shipbuilding | Bulk fluid transfer and process duty | Large Flow / Double Pumps |
Documentation & Brochures
Download the manufacturer literature, including performance curves and dimensional data. Contact us for selection help, full specifications, and quote-specific configuration.
E-Series Sell SheetHot cooking oil pumps, sizes 1–9 gpm, features and industries (PDF)
E & G Series Hot Oil BrochureHot cooking oil line overview with performance curve (PDF)
5 & 8 GPM Features & BenefitsExploded view and serviceability detail (PDF)
DIU Series — Round HubSizes 1–9 gpm, features and dimensions (PDF)
DIU Models 6, 7, 8, 9 gpmConstruction, options, performance curve (PDF)
DIU Series — Square FlangeSizes 10–40 gpm, features and curves (PDF)
DIU Series — Double PumpsSizes 44–80 gpm, dual-pump design (PDF)
DIU Series — Large Flow120–240 gpm rotary gear pumps with curves (PDF)
Why Source Haight Pumps from Watermain Supply
A Baker Family Line
Haight shares its manufacturer with the Baker Water Systems products we already distribute — one accountable source, supported relationship.
Application-Matched Selection
Gear-pump selection lives or dies on fluid data. We match flow, viscosity, temperature, pressure, and seal materials to your duty — not a guess off a shelf.
Full Range Access
From a 1 gpm NSF hot-oil pump to a 240 gpm bulk-transfer unit, plus double pumps and high-temperature builds.
Material & Seal Configuration
Viton, Teflon, Kalrez, mechanical and magnetic-drive options for aggressive, hot, or high-value fluids — configured to spec.
Aftermarket & UniverSeal Parts
Replacement seals, rotors, and rebuild support, including drop-in service for legacy D & DR installations.
Factory Direct on Specials
Custom mounting, high-temperature, corrosion-resistant, and double-pump configurations ordered direct from the factory.
Specifying a Haight Gear Pump?
Tell us the fluid, viscosity, temperature, flow, and discharge pressure — and the motor you're driving it with. We'll match the right Haight series, materials, and seal configuration, with pricing and lead time.
Haight and the Haight Pump name are marks of Haight Pump, a division of Baker Manufacturing Company, LLC. Viton, Delrin, and Kalrez are registered trademarks of their respective owners. NSF is a mark of NSF International. Specifications, materials, and performance are subject to revision without notice and depend on model and configuration. Watermain Supply (a DBA of E4 Industrial LLC) is a Houston, TX-based industrial distributor; confirm exact ratings, materials, and approvals at time of quote.
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