Monoblock gear pumps – TGBLOC series
SPX Johnson TopGear Bloc gear pumps are rotary positive displacement pumps with internal gearing. Their compact design allows for quick and easy installation in locations with limited space. TG Bloc gear pumps are made of modules, which allows for design diversity – various slide bearings, gear and shaft materials, as well as heating or cooling jackets and built-in overflow valves are available. Thanks to the well-thought-out design, manual alignment of the pump and motor is not required. In addition, the TG Bloc series pumps have a self-priming function – provided that there is enough liquid in the pump to fill the clearances and surfaces between the teeth.
They are designed for pumping low-viscosity and non-abrasive media in the food, chemical, bitumen, petrochemical, machine production and animal feed industries.
FEATURES AND BENEFITS
FAST FACTS
SPX Johnson TopGear Bloc gear pumps are rotary positive displacement pumps with internal gearing. Their compact design allows for quick and easy installation in locations with limited space. TG Bloc gear pumps are made of modules, which allows for design diversity – various slide bearings, gear and shaft materials, as well as heating or cooling jackets and built-in overflow valves are available. Thanks to the well-thought-out design, manual alignment of the pump and motor is not required. In addition, the TG Bloc series pumps have a self-priming function – provided that there is enough liquid in the pump to fill the clearances and surfaces between the teeth.
They are designed for pumping low-viscosity and non-abrasive media in the food, chemical, bitumen, petrochemical, machine production and animal feed industries.
| Pump capacity: | 50 m3/h | |
| Max. rotational speed: | 1450 rounds/min | |
| Max. discharge pressure | 16 bars | |
| Temperature: | 180 °C | |
| Viscosity: | 7500 mPa·s | |
| Max. particle size: | 165 µm | |
| Impeller type: | gear, made of cast iron or stainless steel | |
| Pump materialss: | cast iron or stainless steel | |
| Mechanical seal | single type: 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 Roplan RTI 239: SiC/Graphite/FPM Optionally: O-ring kits made of EPDM and FFKM (Chemraz®) |
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| Industry | Application example |
| Petrochemical industry | Pure asphalt or asphalt mixtures, diesel oil, crude oil, lubricating oil, base oil, lubricants. |
| Chemical and dye industry | Glycerin, polyols and polyurethanes. |
| Food industry | Vegetable and animal fats and oils. |
The TopGear (TG) series is a combination of solid construction with small clearances and a unique tooth profile on the driving gear. BLOC series pumps, belonging to the Top Gear family, are rotary positive displacement pumps with internal gear engagement. They operate at the direct rotational speed of the motor, offering an economical solution for pumping low-viscosity and non-abrasive media.
The compact design of this series allows for quick and easy installation in locations where available space is limited. TG Bloc pumps are made of cast iron and stainless steel and are assembled from modules, which allows for design diversity – various plain bearings, gear and shaft materials, and steam-powered heating or cooling jackets are available, as well as built-in overflow valves. Thanks to the thoughtful design, manual alignment of the pump and motor is not required. In addition, the TG Bloc series pumps have a self-priming function – provided that there is enough liquid in the pump to fill the clearances and surfaces between the teeth.

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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Legend: 1. Top cover. 2. Pinion journal. 3. Pump cover. 4. Pinion. 5. Pump body. 6. Impeller. 7. Pump shaft. 8. Mounting flange. 9. Intermediate body. |
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Pump housing with integrated feet and in-line connections
The pump housing can remain installed in the piping system during inspection and repair of rotors and shaft seal. |
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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 access module
The shaft rotor, rotor bearing intermediate body, shaft seal and bearing bracket can be removed for easy inspection, repair and shaft seal replacement. |
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Top-mounted overflow valve
The pre-assembled and adjusted overpressure relief valve can be disassembled for inspection, repair, and if it is necessary to change the direction of rotation or pressure. |
Heating mantles
Safety valves
The relief valves used in the TG Bloc series are spring-loaded valves that open abruptly when the operating pressure rises to the set pressure value for 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 discharge side of the pump 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: | 50 m3/h | |
| Max. rotational speed: | 1450 rounds/min | |
| Max. discharge pressure | 16 bars | |
| Temperature: | 180 °C | |
| Viscosity: | 7500 mPa·s | |
| Max. particle size: | 165 µm | |
| Impeller type: | gear, made of cast iron or stainless steel | |
| Pump materialss: | cast iron or stainless steel | |
| Mechanical seal | single type: 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 Roplan RTI 239: SiC/Graphite/FPM Optionally: O-ring kits made of EPDM and FFKM (Chemraz®) |
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