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Valve technology

Valves

    High dynamics and extremely short response times combined with optimum control characteristics are attained when incorporating Voith valves into your hydraulic system.

    The compact valve design simplifies the integration into the machine or plant. In addition to our directional control valve, flow control valve and pressure valve range, Voith also offers sandwich plate valves and servo valves.

    Contact our experts Service Publications

    Benefits

    • Outstanding dynamic behavior
    • High productivity
    • Low operating costs
    • High precision
    • Easy integration

    Available valves

      Directional control valves

      Extremely fast switching times combined with a very compact design, the Voith directional control valves belong to the solenoid valve product family. These valves achieve a switching time of less than 20 ms, without a booster. Furthermore, when installed with a booster, a switching time of less than 10 ms can be attained.

      A potential space saving of up to 30 percent can be achieved when installing a double-acting solenoid, 4/3 Voith directional control valve.  This space saving potential is based on a comparison of what is commercially available on the market from alternative suppliers.

      The directional control valves are particularly well suited to hydraulic systems with short response times. The valves can be switched in real time virtually, facilitating an efficient and safe actuator cycle design. Short process times and high process reliability can be achieved in your system when installing Voith directional control valves.

      Application fields

      • Hydraulic power packs and hydraulic systems
      • Machine tools
      • General mechanical engineering
      • Presses

      Technical data

      Nominal sizes NG 4, NG 6, NG 10, NG 25
      Standard designs 4/2, 4/3
      Switching times (switching on and off)
      • Less than 20 ms without a booster
      • Less than 10 ms with a booster
      Maximum operating pressure 315 bar
      Maximum volume flow Up to 450 l/min
      Designs
      • Horizontal
      • Vertical
      Ports As per ISO 4401
      Switch position monitoring Optional
      Operating voltages 
      • 24 VDC
      • 230 VAC
      • Other voltages are optional
      Protection class IP 65 

      Advantages over proportional or servo valves

      Hydraulic system designers often use servo valves or proportional valves as switching valves to achieve fast switching times in highly dynamic hydraulic systems. In these cases, you should consider using Voith directional control valves. They offer a whole range of advantages: 

      • Up to 50 percent lower procurement costs
      • Less commissioning effort: no controller setting
      • Lower oil purity required: less filtration effort and no pressure filter circuits
      • Greater protection against malfunctions
      • Up to 50 percent less installation space needed
      • Reduced wiring effort

      Flow control valves

      In order to set volume flow precisely and repeatedly down to less than 10 cm3/min, which equates to roughly a flow rate of 3 drops per second, Voith flow control valves are recommended. They control the volume flow independently of the differential hydraulic fluid pressure and viscosity.

      These flow control valves are ideally suited for hydraulic systems with controlled actuators that perform slow, precise movements. The values are set either with high sensitivity using a scaled hand wheel or by remote control, using a stepper motor with an analog or digital set-point signal. High process quality is consistent and is made possible with the installed actuator that moves uniformly. 

      Application fields

      • Hydraulic systems with actuators that perform slow and precise movements without position control
      • Feed control system in, for example, band saw systems
      • Stroke control systems

      Technical data

      Nominal sizes NG 6
      Design Two-way flow control valve
      Volume flows 10 to 20 000 cm3/min
      Operating pressure Up to 250 bar
      Adjustment methods
      • Scaled hand wheel
      • Stepper motor with analog setpoint signal (0 to 10 V)
      • Stepper motor with digital setpoint signal (Up/Down, CAN, Profibus)
      Ports As per ISO 4401 
      Reproducibility ± 2.5 percent

      Pressure valves

      Operational reliability of your hydraulic system can be improved when using Voith pressure control valves. The valves limit or control the pressure within the hydraulic system. Alternatively, they can switch volume flows as a function of signal pressures. Four types of pressure valves are available:
      • Pressure relief valves
      • Pressure-reducing valves
      • Check valves 
      • Accumulator charging valves

      Application fields

      • Hydraulic power packs and hydraulic systems
      • Machine tools
      • General mechanical engineering
      • Accumulator charging units and accumulator charging circuits

      Technical data

      Pressure relief valves, pressure-reducing valves and check valves

      Nominal sizes NG 4, NG 6
      Maximum operating pressure Up to 315 bar
      Maximum volume flow Up to 30 l/min
      Pressure ranges 3 to 30, 5 to 60, 10 to 150 or 20 to 250 bar
      Adjustment methods
      • Set screw
      • Cap
      • Cap, lead-sealed
      • Star knob
      • Hand wheel
      • Rotary knob
      • Rotary knob with lock
      Designs
      • Plate valve with ISO 4401 ports
      • Sandwich plate valve with ISO 4401 ports
      • Cartridge

      Accumulator charging valves

      Maximum operating pressure Up to 315 bar
      Maximum volume flow Up to 180 l/min
      Pressure ranges 20 to 60, 45 to 80, 80 to 120, 120 to 175, 175 to 250 or 250 to 315 bar
      Switching hysteresis 5, 10, 15 or 20 percent
      Adjustment methods
      • Set screw
      • Cap
      • Cap, lead-sealed
      • Star knob
      • Hand wheel
      • Rotary knob
      • Rotary knob with lock

      Sandwich plate valves

      Up to 50 percent installation space savings can be achieved by installing Voith hydraulic systems, as they require no pipe or hose connections. The building of compact, highly functional but still cost-effective hydraulic systems is made easy with Voith sandwich plate valves. The dynamic behavior of the system is further improved by concise control channels and the resulting short oil columns. The following sandwich plate valves are available:
      • Pressure relief valves
      • Pressure-reducing valves
      • Check valves 

      Application fields

      • Hydraulic power packs and hydraulic systems
      • Machine tools
      • General mechanical engineering

      Technical data

      Nominal sizes NG 4, NG 6, NG 10
      Maximum operating pressure Up to 315 bar
      Maximum volume flow Up to 150 l/min
      Pressure ranges 3 to 30, 5 to 60, 10 to 150 or 20 to 250 bar
      Adjustment methods
      • Set screw
      • Cap
      • Cap, lead-sealed
      • Star knob
      • Hand wheel
      • Rotary knob
      • Rotary knob with lock
      Design Sandwich plate valve with ISO 4401 ports

      Servo valves

      Freely programmable, highly dynamic and with maximum process reliability, Voith servo valves (electro-hydraulic amplifiers) ensure that short-stroke actuator movements are carried out flawlessly. The current actuator position is fed back using a direct mechanical linkage and consequently in real time.  

      Benefit from high-quality parts and a long service life when equipping your machines with our servo valves. When designing position control circuits, the actuator position is usually fed back using electrical signals. The controller signal conversion and processing act as the limiting factors, thus ensuring position accuracy and the dynamic behavior of the control system. 

      Application fields

      • Machines with highly dynamic, short stroke actuator movements
      • Punching machines
      • Presses
      • Shearing machines
      • Cutting machines
      • Stamping machines

      Technical data

      Volume flow Up to 1 500 l/min
      Operating pressure 280 bar maximum
      Settling time 5 to 10 ms typically
      100% control time 10 to 15 ms typically
      Control Using HS4 electronic control (RS-232, CAN, Profibus, Ethernet, USB)
      Methods of mechanical position feedback
      • Gear rack
      • Spindle
      • Toothed belt

      Type SVIZ servo valve includes a gear rack to mechanically feed the current actuator position back

      The stepper or servo motor specifies the position setpoint and actuates a nut-shaft drive that moves the individual valve pistons. The valve pistons open the valve and the actuator moves. The gear rack is linked to the actuator and feeds the actual position back to the valve piston actuation system directly using the pinion (mechanical feedback). As soon as the actuator has reached the programmed position, the pinion returns the valve piston to its initial position and the valve closes again.

      1 Stepper or servo motor
      2 Actuator
      3 Nut-shaft drive
      4 Gear rack
      5 Pinion
      6 Valve piston
      7 Valve piston actuation system

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