Newsletter 2020/04

Newsletter WVH-4B directional poppet valves

Optimization of the NG4 valve series for 500 and 700 bar

We will merge our directional poppet valve series WVM-4B and WVH700 into the new WVH-4B for 700 bar. Thanks to identical connection patterns the 700 bar WVH-4B can be used to directly replace the former 500 bar WVM-4B.

For a better transparence the subplates will be described in a separate datasheet.




Technical data

  • Operating pressure up to 700 bar
  • Max. flow rate up to 12 l/min
  • Porting NG4
  • Solenoid voltage (nominal power) 24 VDC (23 W), 110 VAC (25 W) und 230 VAC (25 W)
  • Switching time 40 - 120 ms
  • Degree of protection IP 63 acc. to EN 60529 / DIN 40050 (solenoid IP 65)




  • long working lifetime and high reliability thanks to hardened and specially ground piston elements
  • good corrosion resistance
  • seat tight
  • safe function with 100% duty cycle and 700 bar
  • function with positive and negative overlap available
  • full replacement for spool valve technology


  • power unit construction (space saving and weight optimized)
  • control of cylinders in a higher pressure range as a full replacement for spool valve technology
  • holding, tensioning and clamping
  • machine tool construction
  • lifting and screwing technology
  • test benches



Our products and services


You will find powerful Radial Piston Pumps up to 1000 bar as well as space-optimizing Axial Piston Pumps with the smallest flow rates and high pressures.


Our valves in nominal sizes 4 and 6 with pressures up to 1000 bar have been well tested and are reliable. They are available in several switching positions and designs.

Systems and accessories

Modular High-Pressure Power Units, Pressure Switches, Level Switches and various accessories complete our product range.

Bieri Hydraulik AG
Könizstrasse 274
CH-3097 Liebefeld

Tel. +41 31 970 09 09