IMO GR Series External Herringbone Gear Pump
Smooth, efficient handling of viscous liquids
Capable of higher flows and pressures than GA Series pumps, GR Series pumps provide high efficiency, pulse-free pumping, even under the most challenging conditions. They are designed to handle viscous fluids across a broad spectrum of flows and pressures. The GR Series’ simple external design has only two moving parts and only one shaft seal to ensure long life and ease of maintenance
Pulse-Free, High-Performance Pumping Across Any Challenge
- Quiet, pulse-free flow
- High-speed pump capability
- Between bearings design
- Hydraulically balanced design
- Stuffing box accommodates packing or mechanical seals
- High-capacity, double row roller bearing
- Self-priming
- Run-dry capability
- Low NPSHR
- Back pullout design
Three Standard Configurations
GR Series pumps are self-priming and available in standard sizes from 40 mm to 200 mm (1.5 in to 8 in) ports. Standard construction is cast iron and carbon steel. For oil and gas applications, an API 676, second edition compliant configuration is available. The GR pump is available in three basic gear widths and with multiple options. With its modular design, the GR can be customized to satisfy a wide range of applications.
- GR: Standard gear width
- GRW: Wide gears for higher capacities
- GRH: Narrow gears for higher pressures
AVAILABLE OPTIONS
- Inboard bearing with mechanical seal for V-belt drive
- Jacketed pump body
- Integral safety relief valve (up to 3GR size)
- Mechanical seals (various materials available)
- Jacketed stuffing box
- Dual stuffing boxes with packing or mechanical seals
- INSUROCK® low friction wear plates
GR Series Quick Selection Chart
It is meant to direct the user to the appropriate performance curve, not to be a substitute for it. The ranges shown are based on typical viscosities and speeds and assume zero
differential pressure.
*Available upon request.
Material of Construction
| Component | Cast Iron Model | Cast Steel Model |
Body, Stuffing Box, Bearing Cover, Gland, Side plates | ASTM A278, Class 35 Cast Iron(Typical) | ASTM A216, Cast Steel Grade WCB |
| Gears | Cast Iron | Cast Iron |
| Shaft | ASTM A576, Class 1040 Carbon Steel | |
| Packing | Graphited Filament Yarn | |
