Swedenborg BK2GG Hydraulic Gear Pump

Swedenborg BK2GG Hydraulic Gear Pump – High-Pressure Positive Displacement Pump

The Swedenborg BK2GG (series reference BK2 / BK2:16GG) is an external hydraulic gear pump built for rigorous duty cycles in marine auxiliary plant, offshore power skids, and heavy industrial machinery. Engineered to maintain continuous volumetric efficiency under elevated pressure regimes, the BK2GG incorporates precision-machined, case-hardened alloy spur gears inside a rigid, high-grade spheroidal graphite iron / alloy body.

Optimized for lubricating oils and mineral hydraulic fluids (ISO VG 32 to VG 68), this unit delivers consistent, pulsation-dampened volumetric discharge. The hydrostatic pressure balance design features pressure-compensated thrust bearing plates that adjust running clearance under variable load conditions, minimizing internal bypass (slip) across elevated operating temperatures.

Model Details

• Manufacturer / Brand: Swedenborg
• Model Series: BK2
• Model Code / MPN: BK2GG (Cross-referenced variant: BK2:16GG / BK2-16 GG)
• Design Concept: External spur gear positive displacement pump
• Condition: New Surplus / Unused Shelf Stock (Clean ports, intact factory protective caps, rust-inhibited internal storage fluid, zero operating hours)

Technical Details:

Pump Features

1. Marine-Duty Structural Casting: Heavy-duty, high-tensile housing dampens operating harmonics, resists pipeline shock loads, and prevents shaft deflection under maximum torque conditions.
2. Low-Noise Tooth Geometry: Optimized root radius and profile tooth mesh minimize hydrodynamic cavitation noise and pressure ripple inside auxiliary hydraulic circuits.
3. Heavy-Duty Hydrodynamic Journal Bearings: High-capacity PTFE-lined plain sleeve bearings rely on forced internal fluid film lubrication to support sustained radial drive shaft loads.
4. Robust Shaft Sealing & Contamination Barrier: Outfitted with an FKM / Viton high-temperature radial shaft seal backed by a dirt wiper ring to isolate the hydraulic loop from external sea spray, grit, and moisture.

Part Number Cross-References & Direct Equivalents

• Swedenborg: BK2GG, BK2:16GG, BK2-16-GG
• Bosch Rexroth / Bucher: Group 2 series 16 cm³ external gear pump equivalents (e.g., 0510 series Group 2)
• Marzocchi: GHP2-D-16 / ALP2-D-16 equivalent footprint
• Casappa: Polaris PLP20.16 / Whisper series equivalents
• Sauer Danfoss / Turolla: SNP2 / Group 2 gear pump assemblies

Frequently Asked Questions

What does the “BK2GG” designation mean on a Swedenborg pump?

The BK2 series designates the frame size (Group 2 industrial/marine standard mounting and gear width), while “GG” indicates a cast iron body configuration (Grauguss / Spheroidal Iron) equipped with standard parallel or metric shaft configurations suitable for heavy hydraulic loads and high operating pressures.

Can the rotation direction of the Swedenborg BK2GG be reversed?

Standard stock pumps are assembled for Clockwise (CW) rotation as viewed from the drive shaft extension. While the internal body and balance plates can be inverted in a dedicated cleanroom workshop to change rotation to Counter-Clockwise (CCW), it requires re-indexing the internal hydrostatic seal retainers and shaft seals. It is recommended to verify shaft direction requirements before commissioning.

What causes early degradation or pressure drop in an external gear pump?

The two most frequent failure modes are fluid contamination (suspended abrasive particles scoring the side wear plates) and suction cavitation (resulting from blocked inlet strainers, high fluid viscosity during cold starts, or inadequate line diameter). Ensuring filtration maintains ISO 4406 Class 19/17/14 and keeping suction lines unrestricted prevents 95% of hydraulic gear pump failures.

Is this unit compatible with biodegradable or synthetic hydraulic oils?

The standard Swedenborg BK2GG comes fitted with FKM (Viton) and NBR static seals, which are fully compatible with mineral oils and polyol esters (HEES). If your plant runs water-glycol fluids (HFC) or phosphate esters (HFD-R), internal clearances and bearing load capacities must be derated, and seal compound compatibility must be rechecked.

Can this pump run continuously at its maximum rated pressure?

The BK2GG is rated for 210 bar continuous duty (P1). The 250 bar rating (P3) is strictly for short intermittent pressure spikes and duty-cycle peaks not exceeding 6 seconds per minute. Continuous operation above 210 bar accelerates journal bearing wear and reduces overall service life.