Series F..U/DU - Integrated pressure relief valves

The gear pumps of the Series F..U/DU are F or D pumps with an integrated pressure relief valve in the pump cover. When the set opening pressure is reached, the valve internally diverts flow from the pressure side to the suction side, thus protecting the system from excessive pressure.

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Gear foot pump series DU with attached pressure relief valve

Cross-sectional view of the FU 590 series gear pump with direct attachment to the drive

Offer & Design

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Properties

Max. flow rate: up to 124 l/min
Media temperature: -40 ... 200 °C
Setting pressure: up to 20 bar

Wide range of applications

Hydraulic systems: Protection against overpressure and damage in hydraulic drives.
Oil and lubrication circuits: Ensuring constant pressure and avoiding system failures.
Chemical processes: Protection of sensitive equipment and pipes against pressure peaks in chemical production plants.

Customizable control ranges

F..U/DU1-3 (max. 20 bar): Gear pumps size 1 to 3
- Pressure ranges and possible presetting of the opening pressure:
  - (I) 2-10 bar
  - (II) 5-15 bar
  - (III) 10-20 bar
F..U/DU4-5 (max. 10 bar): Gear pumps size 4 to 5
- Pressure ranges and possible presetting of the opening pressure:
  - (I) 2-6 bar
  - (II) 5-10 bar

Materials

Part naming	Materials
Housing	Gray cast iron - EN-GJL-250 - (GG25)
Ball	Case-hardening steel, tempered & ground
Gasket	NBR max. 60 °C ( alternatively FPM)