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Seated valves type WVM-6i

The BIERI series WVM-6I consists of direct solenoid operated leakage free seated valves, applicable for high duty cycles. The modular principle of the main components allows for a huge variety of circuit symbols: 2/2-, 3/2-, 3/3-, 4/2-, 4/3- and 4/4-way functions with positive and also negative overlap. Consequently these valves are superior and space-saving alternatives to spool valves which can require additional leackage free shutoff valves.



Patented inline arrangement of cone / seat elements:Less components, compact design, improved reliability and various functions
Pressure compensated design of valve cones, high magnetic force and strong return spring:Safe and fast switching, bidirectional flow on open shift position and double tight with leakage free tightness in closed position
Hardened seat elements (cone and seat):Long operating lifetime and reliability
360° turnable and exchangeable plug-in coil:Arbitrary position of solenoid coil, replacement of coils without opening of the pressure tight spaces
Zinc nickel coated coils, valve body made of corrosion resistant heat-treatment steel:High corrosion resistance
Check valves and orifices can be integrated:Multiple options can easily be realised

Segments & Applications

  • Clamping technology & jig construction 
  • Machine tools - auxiliary functions
  • Forming technology - clamping
  • Small presses
  • Lifting and transport systems
  • Hydraulic tools
  • Test benches and systems
  • Construction
  • Recycling
  • Seat-tight pilot control of passive and/or active logic valves
  • Energy efficient circuits
  • Accumulator charging circuits


  • Patented functional principle
  • Pressure compensated design of hardened and specially grinded valve cones
  • Strong return springs
  • Hidden manual override
  • Check valves and orifices can be integrated
  • Available as 2/2-, 3/2-, 3/3-, 3/4-, 4/2-, 4/3- or 4/4-valve
  • Plate mounted valve with pattern according ISO4401-03
  • 360° turnable and exchangeable plug-in coil
  • Replacement of coils without opening of the pressure tight spaces (slip-in coils)

Technical Data

Hydraulic fluidMineral oil according to DIN 51524 (other fluids on request)
Fluid temperature range-20 to 80°C
Ambient temperature range-20 to 400°C
Viscosity range5 to 400 mm2/s
Seal materialFKM
PortingNG 6 according to DIN 24340 / ISO 4401 / CETOP RP 121 H
Max. operating pressure connection P, A, B500 bar
Max. operating pressure connection T70 bar
Max. flow rate25 l/min-
Filtration (recommendation)according to NAS 1638, class 6 resp. ISO/DIN 4406 Klasse 17/15/12
Duty cycle ED100 %
Solenoid voltage24 VDC (30 W)
Tolerance+/– 10 %
Switching time40 – 110 ms
Degree of protectionIP 65 according to DIN 40050 (or according coil choice)
Weight1.7 kg (1 coil), 2.2 kg (2 coils)
Material/Surface finishValve body: Corrosion resistant steel
Solenoid coil: ZnNi-plated