The Top Gear G series are general-purpose cast iron gear pumps. This series is presented in three subseries:
- Top Gear GS – pumps with a single mechanical seal;
- Top Gear GP – pumps with gland packing;
- Top Gear GM – modular pumps with options for various seal types.
Applications
Johnson Pump gear pumps can be used for pumping explosive, toxic, and highly viscous fluids. To ensure maximum service life, we work closely with our customers to select the optimal seal type and materials for the main pump components for specific operating conditions:
- Chemical industry: pumping sodium silicate, acids, plastics, mixtures of various chemicals, isocyanates.
- Paint and printing industry: pumping paints, inks, polyurethane varnishes, polymers, etching solutions, emulsions.
- Food industry: pumping chocolate, cocoa butter, various fillings, sugar syrup, vegetable fats and oils, molasses.
- Pulp and paper industry: pumping acids, sulfate soap, strong alkaline solutions, kaolin, lime, latex, starch.
- Petrochemical industry: pumping pure bitumen, bitumen mastic, resins, diesel fuel, oil, lubricating oils.
Design Features and Benefits
- Improved suction performance and low NPSH requirement. Large-diameter suction and discharge ports positioned above the pump shaft.
- Enhanced pump design for efficient handling of low- and high-viscosity fluids. Optimized shape of driving and driven gear teeth; uniform flow.
- High efficiency. Axial rotor fixation; adjustable clearances.
- Reliable sealing. Eliminated leaks caused by thermal expansion.
- Material selection for wetted parts, bearings, and seals. Extended pump life thanks to double-row ball bearings; adjustable axial clearances; high allowable axial loads; robust shafts; large-diameter bearings; option for tungsten carbide-coated sliding bearings.
- Easy maintenance. Simple design; option for cartridge seals.
- Reduced downtime. Modular construction of four elements: pump housing; front insert module (driven gear, front cover, driven gear shaft); rear insert module (driving gear, drive shaft, intermediate casing, bearing assembly, pump seal); top removable module (top cover, relief valve).
- Flanged connections per EN and ANSI standards.
- Built-in relief valve for overpressure protection; dual relief valves available for reversible pumps.
- Option for heating jackets.
