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Gear pumps
Gear pumps trap oil between meshing gear teeth and the pump housing, then carry it around to the outlet port. This is the simplest positive displacement pump design, which is exactly why it is also the most durable and the cheapest to maintain. Gear pumps are the standard choice for steering gear circuits, lubrication systems and general auxiliary machinery, both on land equipment and on ships, precisely because ruggedness matters more than precision in those applications.
BPS stocks Bosch and Linde gear pump models directly, including the Bosch hydraulic gear pump R901001426 and the Linde hydraulic pump 20100284, alongside the TCM forklift gear pump range covered in the separate forklift pump identification guide.
Vane pumps
Vane pumps use sliding vanes inside a rotor to move fluid through the housing. They run quieter and smoother than gear pumps at a given flow rate, which makes them well suited to hydraulic control systems where steady, low pulsation flow matters, such as machine tool circuits and some mid pressure industrial systems. Vickers V10 and V20, Denison T6C and T7E, and Yuken PV2R are the vane pump series most commonly specified across industrial and marine equipment.
Piston pumps
Piston pumps use reciprocating pistons arranged radially or axially to pressurize fluid, and they deliver the highest pressure and the highest efficiency of the three pump types in a comparatively compact package. This is why piston pumps are the standard for heavy duty applications, stabilizers, cranes, winches, thrusters, and rig equipment such as top drives and drawworks, where high power density in a limited footprint is the actual design constraint.
Rexroth A10VSO and A4VG, Linde HPV, Kawasaki K3V and K5V, and Parker PVP pressure compensated piston pumps are the series most frequently specified on rig hydraulic power units and offshore equipment, and several of these turn up directly inside the HPUs that power blowout preventers, winches and mast raising systems on land rigs.
Applications by sector
On heavy equipment and trucks, gear pumps dominate steering and general auxiliary circuits, with piston pumps reserved for higher load functions like crane winching. On oil and gas rig sites, hydraulic power units built around piston pumps drive blowout preventers, top drives, drawworks and wellhead tooling, and any equipment installed in a Class I Division I classified area needs pumps and valves rated and sealed against igniting flammable gas, not general industrial equipment moved onto site without checking that rating. On offshore platforms and FPSO vessels, HPUs control safety systems and remote valve actuation, typically built to ATEX or DNV-GL marine certification standards given the corrosive saltwater environment and the cost of downtime on a platform.
On marine vessels specifically, gear pumps handle steering gear and lubrication circuits, vane pumps appear in some control systems, and piston pumps power deck cranes, mooring winches, anchor handling equipment, stabilizers and bow thrusters, the higher pressure, higher power density functions where compact size and efficiency both matter.
Pump brands and series to know
When a pump is being cross referenced or sourced without an OEM part number to hand, matching brand and series first narrows the search considerably before displacement and pressure rating are checked. Gear pumps: Bosch Rexroth GP1 series, Parker PGP2 and PGP3, Linde. Vane pumps: Vickers V10 and V20, Denison T6C and T7E, Yuken PV2R. Piston pumps: Rexroth A10VSO and A4VG, Linde HPV, Kawasaki K3V and K5V, Parker PVP. Flow rates across marine and industrial piston and vane pump ranges commonly span 5 to 500 liters per minute, sized to the specific circuit rather than a single standard figure.
Common ordering mistakes
- Ordering by pressure rating alone without confirming pump type matches the original, a piston pump cannot be substituted with a gear pump on a high pressure circuit regardless of matching flow figures
- Sourcing general industrial hydraulic equipment for a Class I Division I rig site application without confirming hazardous area certification
- Assuming a marine grade pump automatically meets offshore ATEX or DNV-GL certification without checking the specific approval documentation
- Not recording rotation direction and shaft spline before ordering a replacement gear or piston pump
Relevant BPS products. Bosch hydraulic gear pump R901001426, Linde hydraulic pump 20100284, Hydraulic Pump 1001171095, TCM forklift hydraulic pumps, and steering pumps for forklifts and trucks.
What to send with your RFQ. Equipment type and application, rig, marine, crane or heavy equipment, required flow rate and pressure, hazardous area certification if applicable, and the existing pump’s brand and part number or photos if available.
Frequently Asked Questions
What is the difference between a gear pump and a piston pump?
A gear pump moves fluid between meshing gear teeth and is simple, durable and low cost, suited to steering and auxiliary circuits. A piston pump uses reciprocating pistons to reach much higher pressure and efficiency, suited to cranes, winches, thrusters and other high load circuits.
What hydraulic pump brands are used on oil and gas rig sites?
Rexroth A10VSO and A4VG, Linde HPV, Kawasaki K3V and K5V, and Parker PVP pressure compensated piston pumps are commonly specified inside hydraulic power units driving blowout preventers, top drives and drawworks on land and offshore rigs.
Why does hazardous area certification matter for rig site hydraulic equipment?
Class I Division I sites carry an elevated risk of fire and explosion from flammable gases or vapors. Hydraulic pumps, valves and cylinders installed in these areas must be hardened and sealed against ignition, general industrial hydraulic equipment without this certification should not be installed without confirming it meets the site’s classification.
Source referenced in this guide: Flickinger Machine, Hydraulic Equipment Guide for Oil and Gas Operations
Need help identifying the correct part?
Send the equipment make and model, existing part number, required quantity and available photos or technical documents.
Related Guides
- Hydraulic Valve Selection Guide
- Hydraulic Motor Selection and Troubleshooting Guide
- How to Identify a Forklift Hydraulic Pump
Editorial note. Pump construction, brand and series names, and rig and marine application details are drawn from multiple independent technical sources on hydraulic power units, Class I Division I hazardous area requirements, and marine hydraulic systems. BPS product part numbers, Bosch R901001426, Linde 20100284, are pulled directly from BPS’s own live hydraulic pumps and valves category page.