Rexroth PGH4-21 Hydraulic Gear Pump

Rexroth PGH4-21 Hydraulic Gear Pump

Description:

The Rexroth PGH4-21 is a high-performance internal gear pump designed for industrial hydraulic systems requiring low noise, high efficiency, and stable pressure output. As part of the PGH series, it features fixed displacement with axial and radial gap compensation, ensuring reliable operation even under high pressure and varying viscosity conditions. It is widely used in machine tools, injection molding, presses, and lubrication systems.

share:

Rexroth PGH4-21 Hydraulic Gear Pump

Parameter Specification
Pump Type Internal gear pump (fixed displacement)
Size PGH4 (Size 4)
Series 21
Displacement Range ~20 – 80 cm³/rev (depending on model)
Max Working Pressure 280 – 315 bar
Peak Pressure Up to 350 bar
Speed Range ~200 – 3000 rpm
Flow Rate Up to ~90 L/min (depending on displacement)
Rotation Direction Clockwise / Bi-directional (optional)
Hydraulic Fluid Mineral oil (HLP), HFC optional
Viscosity Range 12 – 20,000 mm²/s
Operating Temperature -10°C to +80°C
Mounting Type Flange mounting (ISO standard)
Shaft Type Keyed / Splined
Noise Level Low-noise design
Weight Approx. 15–18 kg