Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of weh16 electro-hydraulic directional control valve in China, also supports customized service. If you're going to wholesale high quality weh16 electro-hydraulic directional control valve made in China, welcome to get pricelist from our factory.
Product Description
Product Summary
The WEH16 Electro-hydraulic Directional Control Valve 300 Liters per Minute 350 bar is an NG16 pilot-operated directional valve. A solenoid pilot valve shifts the main spool, which directs flow to the selected work port. The valve is rated for a maximum operating pressure of 350 bar and a maximum flow of 300 L/min. It uses an ISO 4401 mounting interface. The valve is intended for hydraulic systems that require precise directional control at high flow rates.
How Pilot Operation Works
The WEH16 Electro-hydraulic Directional Control Valve 300 Liters per Minute 350 bar uses a two-stage design. The first stage is a solenoid pilot valve. When the solenoid is energized, the pilot valve shifts and directs pilot oil to one end of the main spool. The pressure difference moves the main spool, which opens the flow path from P to A or B, and from the opposite work port to T.
This two-stage approach has a practical effect. The solenoid only has to move a small pilot spool. The main spool, which handles 300 L/min, moves under hydraulic force. The result is stable switching of high-flow circuits without the large solenoid force that a direct-acting valve would require. The pilot stage also allows the main spool to shift gradually if a switching time adjuster is installed, which reduces pressure shocks in the system.
Technical Specifications
| Parameter | Value |
|---|---|
| Nominal Size | NG16 |
| Max Operating Pressure | 350 bar (P, A, B ports) |
| Max Flow | 300 L/min |
| Mounting Interface | ISO 4401 |
| Working Voltage | DC 12/24, AC 110/220 |
| Seal Material | NBR (-30°C to +80°C), FKM (-20°C to +80°C) |
| Model Number | WEH / J / H / G / D for choice |
| Brand | Onederful® Hydraulic or OEM/ODM |
Pilot Oil Supply Options
The valve can be configured for internal or external pilot supply. Internal supply draws pilot oil from the P port. External supply draws it from a separate X port. There are also internal and external drain options. This matters when the main system pressure is too low or too high for the pilot stage to work properly.
If pilot pressure is too low, the main spool will not shift reliably. If it is too high, it can damage the pilot stage. In systems where the main pressure regularly exceeds 250 bar, a pressure reducing valve is often required in the pilot line. The WEH16 can be ordered with or without this option.
Spool Position and Centering
When the solenoids are de-energized, the main spool needs to return to a defined position. The WEH16 offers spring centering or hydraulic centering. Spring centering uses a mechanical spring to push the spool back to neutral. Hydraulic centering uses pilot pressure to do the same job.
The neutral position configuration determines what happens when the valve is in the center. Different spool types are available, and each one connects the ports differently in neutral. Some block all ports. Some connect P to T. Others connect A and B to T. The correct choice depends on what the actuator needs to do when the valve is not being commanded.
When to Choose This Valve
The WEH16 is suitable for hydraulic systems with a flow requirement of around 300 L/min and a working pressure up to 350 bar. It is a practical choice when the system needs fast, high-flow directional switching and the switching shock needs to be controlled. It is not intended for systems that require proportional flow control or very low flow rates. If the system flow is significantly lower than 300 L/min, a smaller valve may be a better match.
For systems that need a different flow range or a different mounting interface, other models in the WEH series are available.
Manufacturing Advantages
The company has a complete production system for hydraulic products-from component machining and precision assembly to performance testing, every step follows strict processes. With advanced manufacturing techniques and years of industry experience, we ensure product precision, reliable sealing, and stable operation. Every batch is rigorously tested before shipping to guarantee performance across different operating conditions. We also offer flexible customization-tailoring specs, configurations, and control options to meet specific customer requirements.
Sales Advantages
The company offers a wide range of hydraulic products-multi-way valves, solenoid directional valves, pressure valves, flow control valves, and related components-for construction machinery, industrial equipment, and other sectors. With stable production capacity and a mature export service system, we provide overseas clients with a one-stop experience covering selection, technical support, order management, and delivery. Our sales team responds quickly to customer needs, helps with product selection, and builds long-term, stable partnerships.
FAQ
Q: Is the WEH16 control valve suitable for prolonged, continuous operation?
A: Yes. The WEH16 uses a proven pilot-operated design, making it suitable for high-frequency, high-load hydraulic systems. In long-term operation of construction equipment, keeping the hydraulic fluid clean and regularly checking seal condition and control pressure are key to stable, long-term valve performance.
Q: What are the common faults associated with the WEH16 electro-hydraulic valve, and how should they be addressed?
A: Common issues include failure to shift, sluggish operation, and abnormal spool return. Troubleshooting usually involves checking solenoid power supply, pilot pressure, fluid contamination levels, and clogged damping orifices. Keeping the hydraulic system clean can significantly reduce the occurrence of these problems.
Q: How do you select the appropriate WEH16 model?
A: Selection requires a thorough assessment of factors like system pressure, maximum flow rate, control method, mounting interface, spool function, and operating temperature. For actual projects, it's best to provide the equipment model, hydraulic schematic, or operating parameters so our technical team can make the right selection-preventing performance issues from improper sizing.
Q: How is manual emergency operation performed?
A: In case of power failure or solenoid malfunction, use a tool like a screwdriver to push the pilot spool and manually shift the valve. Manual emergency operation is often used during commissioning to test main valve movement-it's more convenient than cycling power repeatedly. However, it's only for temporary emergency use and can't replace normal operation long-term.
Q: Can the WEH16 valve replace other electro-hydraulic valves of the same specifications?
A: The WEH16 uses a proven pilot-operated design and is widely compatible with industrial hydraulic systems in terms of mounting dimensions, port configurations, and functional specifications. For actual applications, selection can be verified using the original valve model, hydraulic schematics, and equipment parameters.
Hot Tags: weh16 electro-hydraulic directional control valve, China weh16 electro-hydraulic directional control valve, manufacturers, suppliers, factory, direction flow control valve, directional control valve spool, hydraulic dcv valve, pilot operated dc valve, pilot operated directional control valve, tandem center directional control valve
