Proportional pressure relief valves PDB-6I

The BIERI PDB-6I is a proportional pressure relief valve from the NG6 700 bar series. It is available both direct controlled for medium flow rates and - in combination with a main stage - pilot controlled for higher flow rates and can be controlled by different amplifiers which allow "open loop" or "closed loop" control.

Max. operating pressure 700 bar
Max. flow rate 25 l/min
Porting NG 6 according to DIN 24340 / ISO 4401 / CETOP RP 121 H

Downloads

Features Advantages
Direct operated with wide useful range High degree of pressure stability
Linear pressure-current characteristic The orifices of the main stage are easily exchangeable

Applications

Electrical control of supply or working pressure in open or closed control loop:

  • remote pressure setting
  • maintaining pressure within small limits, independent of disturbance
  • generating any pressure time curves
  • Pre-relief of large volumes

Design

  • Easy-running proportional solenoid with 360° rotatable and replaceable plug-in coil
  • Low friction, direct force transmission to the valve needle
  • Manual override for manual function test
  • The pilot operated valve consists of the direct operated valve, main stage and end plate
  • External tank connection option with automatic disconnection of the direct operated valve from the system tank line

Technical data

Hydraulic fluid mineral oil according to DIN 51524
(other fluids on request)
Fluid temperature range – 20 to 80 °C
Ambient temperature range – 30 to 50 °C
Viscosity range 5 to 400 mm²/s
Porting NG 6 according to DIN 24340 / ISO 4401 / CETOP RP 121 H
Nominal pressure stages 315 bar, 400 bar, 550 bar, 700 bar
Max. operating pressure connection P, A, B 700 bar
Max. operating pressure connection T 70 bar
Max. flow rate directly operated: 8 l/min
  pilot operated: 25 l/min
Filtration (recommendation) according to NAS 1638 class 6 or ISO/DIN 4406 17/15/12
Duty cycle DC 100%
Solenoid voltage (nominal resistance) 24 VDC (5 Ohm)
Degree of protection IP 65 according to EN 60529 / DIN 40050
Weight directly operated: 2.0 kg
  pilot operated: 3.0 kg
Dither frequency (recommendation) 60 - 400 Hz
Hysterese ≤ 5 % with optimal dither signal
Material valve body: stainless steel
  solenoid coil: ZnNi-plated (1000 h salt spray test)