Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of 4weh hydraulic directional control valve in China, also supports customized service. If you're going to wholesale high quality 4weh hydraulic directional control valve made in China, welcome to get pricelist from our factory.
Hydraulic valves control fluid flow, pressure and direction in hydraulic systems, powering key equipment across industries. They are widely used in construction machinery, manufacturing lines, agricultural machinery, marine and metallurgical facilities.
Manufacturing Process
Raw Material Inspection
High-strength cast iron and alloy steel are checked for composition and mechanical properties before anything else happens.
Precision Machining
CNC equipment handles milling, drilling, grinding, and honing to hold tight tolerances on bodies, spools, and end covers. After machining, all parts go through deburring, cleaning, and dimensional verification.
Heat Treatment
Key components such as spools and valve seats undergo hardening to improve wear resistance and extend service life.
Surface Treatment
Phosphating or other rust-proof coatings are applied to protect against corrosion and improve surface durability.
Assembly
Skilled workers install spools, springs, seals, and control parts in sequence, with torque control on each connection.
Pressure Testing
Every assembled valve goes through hydraulic testing-pressure resistance, leakage detection, and functional debugging under rated working pressure.
Final Inspection
Visual inspection, dimensional confirmation, and test data review. Each valve is individually tested, not spot-checked, with test data filed against its serial number for full traceability.
4WEH Hydraulic Directional Control Valve - User-Focused Product Introduction
1. What Problems Does the 4WEH Solve for You?
The 4WEH is a pilot-operated directional valve for high-flow hydraulic systems. It solves two specific problems:
If your system needs more than 160 L/min, a standard direct-acting solenoid valve won't work - the flow capacity just isn't there. The 4WEH handles up to 1100 L/min with a compact solenoid, because the pilot stage does the heavy work.
If you want to avoid a bulky, oversized solenoid, the 4WEH uses hydraulic pilot pressure to shift the main spool - the solenoid only needs to be small, regardless of the main flow capacity.
In operation: stable shifting under high flow and pressure, built for continuous industrial duty.
For maintenance: standard ISO 4401 mounting patterns. NG10, NG16, NG25, and NG32 sizes match common manifold footprints.
For purchasing: choose internal or external pilot supply to match your circuit. Four sizes, multiple voltages, and spool types available.
2. Practical Use: All Core Advantages Meet Your Actual Needs
Zero-Difficulty Replacement, No Equipment Modification Required for Maintenance
The pilot valve section of the 4WEH follows the industry-standard CETOP 03 / NG6 mounting pattern - the same footprint used by Rexroth, Yuken, and other major brands. When the pilot valve needs replacement, you can swap it directly without re-drilling, adjusting mounting positions, or modifying the oil circuit.
For the main stage, each size follows a standard mounting pattern: NG10 uses ISO 4401-05, NG16 uses ISO 4401-07, NG25 uses ISO 4401-08, and NG32 uses ISO 4401-10. If your manifold follows the correct pattern for your size, the valve bolts straight on.
Maintenance technicians can complete the installation in minutes. No re-piping, no custom adapters - just bolt it down, connect the ports, and you're back in production. This means less downtime and lower modification costs.
Full Voltage Coverage, Suitable for Global Equipment
We stock four mainstream voltages: DC12V, DC24V, AC110V and AC220V. A compatible option is available whether for domestic industrial power supply, vehicle-mounted DC power supply, or power grids in different overseas countries.
The solenoid coil features reinforced protection against moisture and electrical interference, reducing the risk of burnout in demanding environments. For the pilot stage, the coil is the only electrical component - the main stage operates hydraulically, which means less heat generation in the solenoid and longer service life compared to direct-acting valves of similar capacity.
Company background
Shijiazhuang Laiye Import & Export Trading Co., Ltd., part of Hebei Onederful® Hydraulic Technology Co., Ltd., has been manufacturing hydraulic components since 1988. The company focuses on R&D, production, and sales of hydraulic valves, directional valves, pressure valves, flow valves, accessories, and special components. Products are exported to Russia, Europe, the Middle East, South America, Asia, and other markets.
Q: What is the difference between 4WEH and 4WE?
A: 4WE is a direct-acting solenoid valve - the solenoid directly pushes the spool. 4WEH is pilot-operated - a small pilot valve uses hydraulic pressure to shift the main spool. The 4WEH gives you much higher flow capacity (up to 1100 L/min) with a relatively small solenoid.
Q: Can I use a 4WEH Hydraulic Directional Control Valve with a variable displacement pump?
A: Yes, but pay attention to the pilot supply. If the pump pressure drops below the pilot minimum (typically 10 bar) during operation, the valve may not shift reliably. In that case, use external pilot supply via port X.
Q: How do I know if I need internal or external pilot supply?
A: If your system pressure at port P stays above 10 bar at all times, internal pilot works fine. If the pressure drops below that - common with load-sensing pumps or during idle periods - you need external pilot supply. Send us your circuit schematic and we'll confirm.
Q: What is the minimum pilot pressure required?
A: Typically 10 bar above tank pressure. Below that, the pilot stage doesn't generate enough force to move the main spool reliably. Check the specific data sheet for your size and spool type.
Q: Can both solenoids be energized at the same time?
A: No. For dual-solenoid valves, the two coils must not be energized at the same time - doing so will burn out the coils. Always de-energize one end before energizing the other.
Q: What happens if the pilot pressure drops while the valve is shifted?
A: The main spool may not stay fully shifted - it could drift back toward neutral or chatter. This is why external pilot supply is sometimes required on systems with unstable pressure.
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