Gear pumps for demanding applications – TGH series
SPX Johnson TGH pumps are universal gear pumps designed for the most demanding industrial applications. They are perfect for media with medium or high viscosity and liquids with high temperature. They have a solid construction and a wide selection of construction materials and accessories. They are characterized by a simple principle of operation, in which the liquid flows through the pump evenly with little pulsation. They are characterized by low energy consumption and a high level of hydraulic efficiency and the possibility of precise capacity regulation. These pumps can also have reversed flow direction and self-priming function.
TopGear H gear pumps are used in many industries, such as: food, chemical, paint, paper, and also in construction.
FEATURES AND BENEFITS
FAST FACTS
SPX Johnson TGH pumps are universal gear pumps designed for the most demanding industrial applications. They are perfect for media with medium or high viscosity and liquids with high temperature. They have a solid construction and a wide selection of construction materials and accessories. They are characterized by a simple principle of operation, in which the liquid flows through the pump evenly with little pulsation. They are characterized by low energy consumption and a high level of hydraulic efficiency and the possibility of precise capacity regulation. These pumps can also have reversed flow direction and self-priming function.
TopGear H gear pumps are used in many industries, such as: food, chemical, paint, paper, and also in construction.
| Pump capacity: | 130 m3/h | |
| Max. rotational speed: | 1450 rounds/min | |
| Max. discharge pressure: | 16 bars | |
| Temperature: | 300 °C | |
| Viscosity: | 80,000 mPa·s | |
| Max. particle size: | 225 µm | |
| Impeller type: | toothed, made of cast iron, nitrided ductile iron or stainless steel | |
| Pump materialss: | AISI316 stainless steel, carbon steel, ductile iron | |
| Types of sealing | ||
| Packing seal: | Version without spacer ring: rings made of graphite-reinforced PTFE, aramid or graphite fibers. Version with spacer ring: rings made of graphite-reinforced PTFE, aramid or graphite fibers. Reversed version; chocolate design: rings made of graphite-reinforced PTFE, aramid or graphite fibers. |
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| Single mechanical seal: | Burgmann MG12: Graphite/SiC/FPM or SiC/SiC/FPM Burgmann M7N: SiC/Graphite/FPM, SiC/Graphite/PTFE jacket, SiC/SiC/FPM or SiC/SiC/PTFE-FFKM Optionally: O-ring sets made of EPDM and FFKM (Chemraz®) |
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| Single cartridge mechanical seal: | Cartex with gland packing sleeve: SiC/SiC/FPM, SiC/SiC/PTFE Cartex with lip seal: SiC/SiC/FPM, SiC/SiC/PTFEoptionally: O-ring sets made of EPDM and FFKM (Chemraz®) |
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| Double cartridge mechanical seal: | Cartex: SiC/SiC/FPM, SiC/Graphite/FPM, SiC/SiC/PTFE-SiC/Graphite/FPM
optionally: O-ring sets made of EPDM and FFKM (Chemraz®) |
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| Triple cassette lip seal: | PTFE seals/FKM Viton (fluoroelastomer) O-rings PTFE seals/without O-rings |
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| Industry | Application example |
| Petrochemical industry | Pure asphalt or asphalt mixtures, diesel, crude oil, lubricating oil, base oil, lubricants. |
| Chemical and dye industry | Sodium silicate, acids, plastics, mixed chemicals, isocyanates, polyols. |
| Pulp and paper industry | Acid, soap, lye, black liquor, kaolin, lime, latex, sludge. |
| Food industry | Chocolate, cocoa butter, fillings, sugar, vegetable fats and oils, molasses, animal feed. |
The TopGear (TG) series is a combination of solid construction with small or large clearances and a unique tooth profile on the driving gear. TG H series pumps are versatile internal gear pumps designed for the most demanding applications in today’s industry. Their main advantages are a combination of solid construction, flexibility in the selection of clearances, a unique shape of the interdental spaces, and a wide range of material designs and additional options, such as a heating jacket or overflow valves.
Pumps of the TG H series are characterized by a simple operating principle in which the liquid flows through the pump evenly with small pulsations. They are characterized by low energy consumption and a high level of hydraulic efficiency, as well as the possibility of precise capacity regulation. These pumps can also have a reversed flow direction. The modular design based on many variants and options allows the pump to be perfectly adapted to a specific application. The TG H series also has a very wide selection of shaft seals – gland packing packing, single or double mechanical seal, single or double cartridge mechanical seal and triple cartridge lip seal.
Pumps in this series were created for the most demanding applications. They handle media with medium or high viscosity and liquids with high temperature perfectly. TopGear series pumps are self-priming and used in many industries, such as: food, chemical, paint, paper, and construction.

The rotor and pinion rotate and mesh with each other. This creates sealed chambers with variable volume, resulting in a vacuum that forces the medium to flow into these spaces. The liquid is transported in the chambers from the suction side to the discharge side. The spaces are separated from each other by an element that prevents the liquid from returning to the suction side. The medium is pumped to the discharge side as a result of the reduction in the volume of the interdental spaces.
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Pump housing with integrated feet and in-line connections
The pump housing can remain installed in the piping system during rotor and shaft seal inspection and repair. |
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Front Access Module
The entire front (pinion, cover and pinion shaft) can be removed for easy internal inspection and repair. |
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Back pull-out design
Impeller with shaft, intermediate casing with rotor bearing, shaft seal and bearing bracket can be removed for easy inspection, repair and replacement of the shaft seal. |
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Top-mounted overflow valve
The pre-assembled and adjusted pressure relief valve can be disassembled for inspection, repair, and if it is necessary to change the direction of rotation or pressure. |

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1. Pump body
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| Front Access Module
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2. Pinion cover with spigot
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“S” or “T” type heating mantle mounted on the lid (option)
Additional front cover with heating jacket with several types of connections.
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3. Pinion with bushing
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| Rear access module
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4. Impeller and pump shaft
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5. Intermediate corpus
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6. Shaft seal
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7. Ball bearing bracket with additional support
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“S” type heating mantle mounted on the lid
Steam-powered threaded connection version.
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Heating mantle type “T” mounted on the lid
Flanged version powered by thermal oil.
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Pinion trunnion cover (only available with “T” type heating jacket option)
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Electric heating in the pinion stub (available on request for certain models only)
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Electric heating in the pinion stub (available on request for certain models only)
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Electric intermediate body heating (available on some models only)
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Heated jacket around shaft seal (option)
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Relief valve
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Packing seal (gland packing seal)
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Single mechanical seal
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Double mechanical seal
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Cassette mechanical seal
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Triple lip cassette seal
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The relief valves used in the TGH series are spring-loaded valves that open abruptly when the operating pressure rises to the set pressure value to which the spring is pre-set. These valves limit the differential pressure (∆p) (or operating pressure) between suction and discharge, not the maximum pressure in the system. If the liquid cannot escape when the pump’s discharge side is blocked, overpressure can cause serious damage to the pump. The relief valve provides an escape route by directing the media back to the suction side once a certain pressure level is reached. An open relief valve signals that the system is not operating correctly.
| Pump capacity: | 130 m3/h | |
| Max. rotational speed: | 1450 rounds/min | |
| Max. discharge pressure: | 16 bars | |
| Temperature: | 300 °C | |
| Viscosity: | 80,000 mPa·s | |
| Max. particle size: | 225 µm | |
| Impeller type: | toothed, made of cast iron, nitrided ductile iron or stainless steel | |
| Pump materialss: | AISI316 stainless steel, carbon steel, ductile iron | |
| Types of sealing | ||
| Packing seal: | Version without spacer ring: rings made of graphite-reinforced PTFE, aramid or graphite fibers. Version with spacer ring: rings made of graphite-reinforced PTFE, aramid or graphite fibers. Reversed version; chocolate design: rings made of graphite-reinforced PTFE, aramid or graphite fibers. |
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| Single mechanical seal: | Burgmann MG12: Graphite/SiC/FPM or SiC/SiC/FPM Burgmann M7N: SiC/Graphite/FPM, SiC/Graphite/PTFE jacket, SiC/SiC/FPM or SiC/SiC/PTFE-FFKM Optionally: O-ring sets made of EPDM and FFKM (Chemraz®) |
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| Single cartridge mechanical seal: | Cartex with gland packing sleeve: SiC/SiC/FPM, SiC/SiC/PTFE Cartex with lip seal: SiC/SiC/FPM, SiC/SiC/PTFEoptionally: O-ring sets made of EPDM and FFKM (Chemraz®) |
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| Double cartridge mechanical seal: | Cartex: SiC/SiC/FPM, SiC/Graphite/FPM, SiC/SiC/PTFE-SiC/Graphite/FPM
optionally: O-ring sets made of EPDM and FFKM (Chemraz®) |
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| Triple cassette lip seal: | PTFE seals/FKM Viton (fluoroelastomer) O-rings PTFE seals/without O-rings |
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