RX series
Radial piston pumps with variable flow rate 

RV series
Radial piston pumps with variable flow rate

RF series
Radial piston pumps with constant flow rate

RH series
Radial piston pumps with constant flow rate


4949 Urbana Road Rear    
Springfield OH, 45502

Tel  (937) 390-2100
Fax (937) 390-9715
Click To See Email

Pumps with variable flow

Our RX and RV series high-pressure radial piston pump designs are based on decades of experience and development. Our pumps are built for continuous use at an operating pressure of up to 6,500 psi and a service life far beyond 30,000 hours. We currently have pumps in the field that have been operating for more than 60,000 hours and are still in use today!

Our pumps provide extremely fast controllability, low-pulsation & low-noise operation unlike any other product on the market today. The flow direction of all our variable pumps is reversible (4-quadrant operation). A highly precise electronically adjustable servo controller can be adjusted to any required characteristic curve. The flow rates of our pumps range from 40 gpm to 265 gpm at full pressure.

RX series
RV series

Oil Hydraulic Drive Examples - Variable Flow (PMSD)

12 RX pump drive (PMSD) for Villares Metals (Brazil)
2 RX pump drive (PMSD) for Standard Steel (USA)
9 RX pump drive (PMSD) for Press Forge (USA)
10 RX pump drive (PMSD) for Union Electric (USA)
7 RX pump drive (PMSD) for Weber Metals (USA)

Wepuko PAHNKE’s PMSD drive

PMSD stands for PAHNKE Modified Sinusoidal Direct drive. This is a design developed by PAHNKE Engineering in accordance with plans from Hans-Joachim Pahnke.

This drive does not require any valves for the control of the press movement. The RX-series high-pressure pumps are able to determine the force, speed and direction in a fast, smooth (shock free) and efficient manner. These pumps are extremely reliable and will perform flawlessly for at least 30,000 hours. Some of our customers have logged more than 50,000 hours of operation without needing any repairs!

Energy savings of approximately 25% vs. any other drive system of comparable drive system is achieved as a result of this brilliant design. All of our new presses are equipped with hydraulic drives that are designed and manufactured in accordance with the PMSD principle.

16-pump PMSD drive of an 8,000/10,000 ton press.