4WRZE 4WRZE25 Proportional Valve R900954661 4WRZE16EA150-7X/6EG24ETK31/A1M R900954662 4WRZE16W8-100-7X/6EG24K31/A1D3M

The 4WRZE25 is a high-response electro-hydraulic proportional directional valve launched by SENHENGYUAN. Its core advantages lie
in fast response speed and high control precision, making it widely used in hydraulic systems that require accurate movement of
actuators.
Core Meaning of Model Coding (Taking 4WRZE25W8-220-7X/6EG24N9ETK31/A1D3M as an Example)
By decoding the model, you can quickly clarify the key parameters of the valve and avoid selection deviations:

1. 4: Valve function code, representing a “4-way valve” that enables bidirectional control of actuators (such as cylinders and
motors).
2. WRZE: Series and characteristic code. “WR” stands for proportional directional valve, and “ZE” indicates “high-response
design” with a response time up to the millisecond level.
3. 25: Nominal size code, corresponding to a nominal diameter of 25mm. It determines the maximum flow capacity of the valve (the
rated flow is usually about 200-300 L/min, and details should be referred to the manual).
4. W8: Mounting flange code. “W8” represents a mounting flange conforming to the ISO 4413 standard, which is compatible with
conventional hydraulic valve blocks.
5. 220: Rated flow code. It means the rated flow of the valve is 220 L/min under a specific pressure difference (usually 10 bar),
which is a key parameter for matching the system flow demand during selection.
6. 7X: Control method code. “7” indicates “electrical feedback control” (equipped with a position sensor that can correct the
spool position in real time to improve control precision), and “X” is the design version number.
7. 6EG24N9ETK31: Electrical interface and coil parameters. “EG24” means the rated voltage of the coil is DC 24V, “N9” indicates
short-circuit protection function, and “ETK31” is the plug interface type.
8. A1D3M: Additional function code. “A1” means it has a diagnostic function, “D3” indicates compatibility with a specific oil
viscosity range, and “M” represents an environmentally friendly coating design.

Core Performance Features
1. High Response: The spool displacement response time can be as fast as less than 20ms, which can quickly follow the change of
electrical signals and avoid the movement lag of actuators (such as fast positioning of precision machine tools and mold
clamping buffer of injection molding machines).
2. High Precision: Built-in spool position sensor forms closed-loop control, which can control the displacement error within
±0.5% and ensure stable action repeatability.
3. High Contamination Resistance: Key components inside the valve undergo hardening treatment. Combined with high-precision
filtration requirements (usually NAS 8 class or higher), it can adapt to oil contamination in industrial environments and
extend service life.
4. Multi-Function Integration: It supports composite control of flow and pressure. Some models can set ramp time
(acceleration/deceleration time) through software to avoid impact during system start-up and shutdown.

Typical Application Scenarios
* Industrial Automation: Spindle feeding of precision machine tools, slide position control of punch presses, and motion axis
drive of laser cutting equipment.
* Construction Machinery: Precise movement of booms/sticks of large excavators, and stable telescoping of booms of concrete pump
trucks.
* Special Equipment: Load simulation of test benches (such as shock absorber testing of automobiles and performance testing of
hydraulic motors), and control of hydraulic actuators in the aerospace field.