Hydraulic Solenoid Valves 4WEH16 (NG16 / CETOP 7)

Maximum flow for heavy industry. 4WEH16 directional control valves are electrohydraulically operated (piloted), designed to handle flows of up to 300 l/min . Compliant with the ISO 4401-07 (CETOP 7) standard, they are ideal for injection molding machines, presses, and large mobile applications. Guaranteed stable operation at pressures up to 315 bar.
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4WEH16 Distributors – Two-Stage Control Power

In this category, you'll find advanced hydraulic solenoid valves in the NG16 nominal size (ISO designation: size 07, CETOP 7). Unlike smaller valves (such as NG6 or NG10), which are directly controlled by a solenoid, 4WEH series valves operate in a two-stage (electro-hydraulic) system.

How does it work? (Two-stage construction)

The forces required to move a large slide at a flow rate of 300 liters per minute are too great for a solenoid coil alone. Therefore, the 4WEH16 valve consists of two sections:

  1. Main Stage: The lower, large body with an operating slide that controls the main oil flow.
  2. Pilot Valve: The upper, smaller solenoid valve (usually a standard NG6/CETOP 3) that hydraulically "overrides" the main spool.

Key technical parameters

The 4WEH16 valves we offer are replacements compatible with products from leading brands (Bosch Rexroth, Vickers, Atos, Parker).

  • Maximum flow: Up to 300 l/min (depending on slide pattern).
  • Working pressure: P, A, B up to 315 bar (or 350 bar in High Pressure versions).
  • Control and Drain (X and Y): This is a key parameter in the selection process. We offer valves with configurable pilot supply (internal/external) and pilot oil drain (internal/external).
  • Slider diagrams: Most popular logical functions available: E, J, G, H (according to Rexroth symbols).

X and Y configuration (Important for the customer)

Most standard 4WEH16 valves are supplied in the following configuration:

  • Pilot Power (X): Internal (takes oil from channel P).
  • Pilot Drainage (Y): External (through a separate channel to the tank) or Internal (to the T channel).
  • Note: Before installation, always check in the DTR how your system is configured to avoid damage to the pilot by back pressure!

Application

Due to their large dimensions and capacity, these valves are used in stationary industrial machines:

  • Plastic injection molding machines.
  • Hydraulic presses and folding machines.
  • Foundry machines.
  • Marine and offshore hydraulic systems.

FAQ: Hydraulic Solenoid Valves 4WEH16 (NG16 / CETOP 7)
1. What does the letter "H" in the name 4WEH16 stand for and how is it different from the standard 4WE16?

The letter "H" indicates that the valve is electrohydraulically controlled (has a pilot). Unlike smaller valves (like the 4WE6 or 4WE10), where an electromagnetic coil directly moves the spool, in valves of the NG16 size, the main spool is too large and heavy.
Therefore, the 4WEH16 solenoid valve consists of two parts:

  • Main valve (bottom): The main flow of operating oil to the actuators flows through it.
  • Pilot Valve (top): This is typically a small NG6 (CETOP 3) solenoid valve. A coil opens a small amount of oil, and this pressurized oil moves a large slide in the main valve below.
2. What is the maximum flow and application for NG16 (CETOP 7) valves?

4WEH16 solenoid valves are powerful components designed for heavy duty hydraulics.

  • They handle huge flows, up to 300 l/min .
  • They operate at working pressures up to 315 bar (and in reinforced versions even 350 bar).
    They are indispensable in hydraulic presses with pressures of hundreds of tons, large plastic injection molding machines, heavy construction and mining machines, and stationary industrial units.
3. Why does the coil "tick" but the main slider in the 4WEH16 does not move?

This is the most common service problem in pilot-operated systems. If the upstream pilot valve responds to current but the machine doesn't run, the cause is usually a lack of minimum pilot pressure .
For the small valve to move the large spool, the system must generate a minimum pressure (usually around 8–12 bar). If your system uses an open-centre spool (e.g., a G-pattern, where oil flows freely into the reservoir), the system pressure drops to almost zero, preventing the main valve from switching. In such situations, a special pre-fill valve or external pilot supply (port X) should be used.
4. What do channels X and Y mean in the CETOP 7 connection board?

Larger division plates (NG16 and above) have additional ports that are crucial for the proper operation of the 4WEH valve:

  • Port X (Pilot Supply): Pilot oil is supplied here. The supply can be internal (taken directly from the main port P) or external (taken through a separate tube from a separate, small steering pump).
  • Y-Port (Pilot Return): This is where the pilot oil returns to the reservoir. The return can also be internal (connected to the main T-port) or external (routed through a separate hose, which is required when the main T-line experiences high pressure surges).
    At BRhydraulic we offer valves with the option of reconfiguring the control by screwing in or unscrewing dedicated plugs (nozzles) inside the body.
5. What slider schemes are available in the 4WEH16 series?

We offer a full range of diagrams for industrial systems, the most popular of which are:

  • Slider E: Closed in the middle position – blocks flow in all directions.
  • Slider G: Connects port P to T (pump unloading), keeping ports A and B closed (actuator locked).
  • J/H Slider: Designed for hydraulic motors and systems requiring soft stopping.
    Operating tip: In large 4WEH16 valves, the main spool switching time can be continuously adjusted (delayed) by using special throttles between the main valve and the pilot, which prevents destructive water hammer in the system.

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