Directional poppet valves WVH-4B-Bi

BIERI seated valves out of series WVH-4B-Bi are bidirectional, directly operated, oil leakage free valves of size NG4, suitable for constant pressure ranges up to 700 bar with mineral oils and also with high viscous media like grease up to NLGI-class 2. These electrically operated valves are suitable for bidirectional flow.

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Features Advantages
Directly operated 2/2-and 3/2-way functions, bidirectional seat tight with defined pattern, applicable in very rough ambient conditions and very low temperatures
Seat tight Good suitability for high viscous media (grease)
360° turnable and exchangeable plug-in coil Arbitrary position of solenoid coil, replacement of coils without opening of the pressure tight spaces
Zinc iron coated coils, valve body made of corrosion resistant heat-treated steel High corrosion resistance
As "stand-alone" valves or in valve banks with subplates Dead space optimized (for applications with grease)

Segments & Applications

  • High viscous lubrication systems, power units for grease lubrication
  • Lubrication of rails and tracks
  • Machine tools – auxiliary functions
  • Small presses
  • Lifting and transport systems
  • Hydraulic tools
  • Test benches and systems
  • Construction & recycling

Design

  • With hardened closing elements as cone seat
  • Solenoids with slide on coil technology
  • Mounting on single subplate (EAP) as stand-alone valve or in valve bank with supplate (APH)

Technical Data

Hydraulic fluid Mineral oil according to DIN 51524 /Grease according to class NLGI 2
Fluid temperature range -20 to 80°C (down to -40°C on Request)
Ambient temperature range -30 to 50°C (down to -40°C on Request)
Viscosity range 5 mm²/s to class NLGI 2/s
Porting NG 4 according to Bieri standard
Max. operating pressure 700 bar
Max. flow rate / mass flow 12 l/min (Grease: approx. 2.5 kg/min)
Filtration (recommendation) According NAS 1638 class 6 resp. ISO/DIN 4406 17/15/12
Duty cycle DC 100%
Solenoid voltage (nominal power) 24 VDC (27.2 W) / 110 VAC (25 W) / 230 VAC (25 W)
Voltage tolerance +/- 10%
Switching time 40 - 120 ms (depending on viscosity)
Degree of protection according DIN 40050 IP 63 according to EN 60529 / DIN 40050 (solenoid IP 65)
Weight 0.85 kg
Material Corrosion-resistant steel
(coil housing: ZnFe - corrosion protection)