Hydraulic Solenoid Valves – Spool Valves (CETOP)

Precise control at the touch of a button. We offer a wide selection of electrically operated hydraulic valves (solenoid valves). Available in NG6 (CETOP 3) and NG10 (CETOP 5) standards. Complete valves with coils for 12V, 24V, and 230V voltages are available, ready for panel mounting. Reliability in every application.
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The highest price is 4.305,62 zł
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Hydraulic solenoid valves – Automation of power systems

The hydraulic solenoid valve (also known as an electrically operated spool valve) is a key element of modern power hydraulic systems. It allows for remote control of oil flow direction, thus controlling the movement of hydraulic actuators or motors without the need for manual levers.

Our offer includes valves manufactured according to international standards, which guarantees their full interchangeability with products from brands such as Bosch Rexroth, Vickers, Parker and Atos.

Available size standards (ISO 4401 / CETOP Standard)

To select the right solenoid valve, it is crucial to determine the size of the connection plate:

  • NG6 (CETOP 3) : The most popular standard for flows up to approximately 60-80 l/min . Ideal for smaller machines, hydraulic power packs and machine tools.
  • NG10 (CETOP 5) : Larger valves for flow rates of 100-120 l/min , used in heavier industrial applications.

Schematics and Control Voltages

Electric distributors differ in their slide configuration (oil flow in the neutral and operating positions). We offer the most frequently requested diagrams:

  • 4/3 (four-way, three-position): E.g. "E" (all paths cut off in the zero position), "H" (PT, AB connection cut off - so-called pump idle), "J" (all paths connected).
  • 4/2 (four-way, two-position): For simple on/off control or direction change without neutral position.

Each solenoid valve is equipped with replaceable coils (solenoids). Available voltages are:

  • 12V DC / 24V DC: Standard in mobile hydraulics (vehicles, agricultural machines).
  • 110V AC / 230V AC: Standard in industrial hydraulics (injection molding machines, stationary presses).

Why choose our solenoid valves?

  1. Long life: Hardened sliders and precise fit ensure millions of operating cycles.
  2. Emergency manual override: Most models have a pin (button) that allows the valve to be mechanically overridden in the event of a power failure.
  3. Plugs included: We often offer valves with DIN plugs equipped with LEDs, which facilitates diagnostics (you can see whether there is power).

Application

Solenoid valves are essential wherever automation or remote/PLC control is required: in presses, injection molding machines, CNC machine tools, as well as in complex hydraulic systems of agricultural and construction machines.

FAQ: Hydraulic Solenoid Valves (CETOP Spool Valves)
1. How to choose the size of the solenoid valve for the hydraulic system (NG6, NG10, NG16)?

The choice of distributor size (marked as NG or CETOP standard) depends primarily on the maximum oil flow (l/min) in your system and the required operating pressure.

  • NG6 (CETOP 3 / 4WE6 series): The most popular standard. Ideal for flows of 60–80 l/min. Commonly used in agricultural machinery, loaders (Turach), and smaller industrial machines.
  • NG10 (CETOP 5 / 4WE10 series): Used in medium flow systems, typically up to approximately 100–120 l/min.
  • NG16, NG25, NG32 (4WEH16, 4WEH25, 4WEH32 series): These are powerful distributors designed for heavy industrial hydraulics, hydraulic presses and large construction machines, where flows reach several hundred liters per minute.
    Remember to always check the diagram of the connection plate (so-called division plate) to which the valve will be mounted.
2. What do the slide symbols E, J, G, H in valve names mean (e.g. 4WEH32J, 4WE10E)?

These letters define the hydraulic diagram of the slide , i.e. how the channels are connected (P - supply, T - return, A and B - outputs to the actuator) in particular operating positions, especially in the neutral (middle) position:

  • E-type slider: In the neutral position, all ports (P, T, A, B) are isolated. The actuator is locked in position. (Very common in agricultural machinery).
  • G-type spool: In the neutral position, channels P and T are connected (oil flows freely into the tank, relieving the pump) and channels A and B are closed (actuator is stationary).
  • J and H type slide: Offers different relief and free run options for specific machine systems, such as hydraulic motors, where free run is required.
    At BRhydraulic, we offer solenoid valves in a full range of diagrams (E, J, G, H) to perfectly match your machine.
3. What supply voltage for the solenoid valve coil should I choose?

The voltage selection (12V, 24V or 230V) must correspond to the electrical installation of the target device:

  • 12V DC and 24V DC: Standard for power hydraulics in mobile machines (agricultural tractors, excavators, cranes, tow trucks).
  • 230V AC: Standard in stationary hydraulic power supplies, workshop presses, injection molding machines and industry where valves are powered from the mains.
    Most solenoid valves (e.g. 4WE6 and 4WE10 series) in our store allow for easy replacement of the coil itself in the event of a voltage change in the system.
4. Why is my hydraulic solenoid valve stuck or not switching?

Failures of slide valves are most often due to three reasons:

  1. Contaminated hydraulic oil: Metal particles or dirt get trapped between the precisely fitted spool and the valve body, causing it to physically jam.
  2. Burnt solenoid coil: The coil is not generating the magnetic field needed to move the slider (check the coil resistance with a multimeter).
  3. Excessive return pressure (T port): Exceeding the allowable return line pressure may block the slide operation.

BRhydraulic expert advice: 90% of sticking spool valve problems are caused by inadequate filtration. Regularly replace your hydraulic system filters to ensure smooth operation of your CETOP solenoid valves!
5. Can CETOP solenoid valves be mounted in any position?

Theoretically, yes, but hydraulic manufacturers recommend horizontal mounting (spool axis horizontal) . Vertical mounting can cause the spool to shift slightly under its own weight if the centering springs are worn out, which in extreme cases can lead to unwanted internal leaks. Always use high-quality mounting screws tightened to the appropriate torque to avoid deforming the valve body.

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