Poppet hydraulic directional control valve WL5208

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Product overview
A liquid proportional valve WL 5208 by Weilong is an electronically controlled flow device that provides continuous proportional regulation of compatible liquids. Designed for process control, dosing and automated systems, it modulates valve opening in response to an electrical input to deliver accurate flow rates for water, oils, coolants, chemicals and other compatible fluids. Key selection criteria include flow range, pressure rating, fluid compatibility, temperature limits and control interface requirements.

How it works
The valve translates an electrical control signal into a proportional mechanical position to vary flow. Typical sequence:

• A controller (PLC or electronic control unit) sends a proportional input signal.
• An actuator interprets the signal and repositions the internal regulating element (spool, poppet, needle, etc.).
• The valve opening changes continuously: reduced opening lowers flow, increased opening raises flow.
• The device supports intermediate positions for smooth regulation rather than simple open/closed operation.
• Advanced installations may use feedback (flow, pressure or position) for closed-loop accuracy.

Applications

• Industrial automation: coolant, lubricant and process liquid control on automated equipment.
• Water treatment: metering, dosing and filtration flow regulation.
• Chemical processing: proportional dosing and process flow control with suitable materials and seals.
• Cooling systems: flow modulation based on temperature or heat load.
• Dosing equipment: accurate proportional dispensing of liquids.
• Food & beverage: controlled liquid handling and CIP processes when materials are compatible.
• Manufacturing machinery: control of cutting fluids, lubricants and hydraulic-compatible liquids.
• Agriculture: irrigation, spraying and nutrient delivery systems.
• Medical & laboratory: regulated liquid delivery where compatibility and certification allow.

Advantages

• Accurate continuous flow regulation for process stability.
• Integrates with PLCs and electronic controllers for automation-ready operation.
• Adjustable to production/process requirements for flexibility.
• Improves repeatability and reduces liquid waste through precise control.
• Available in fast-response variants for dynamic applications.
• OEM customization possible for materials, fittings and electrical interfaces.

Disadvantages

• Higher cost and greater complexity than basic on/off valves.
• Requires appropriate electronic driver or controller and correct sizing.
• Sensitivity to contamination—filtration and cleanliness are critical.
• May need calibration to map input signal to flow output accurately.
• Flow performance can vary with pressure, viscosity and temperature changes.

Troubleshooting – common issues and checks

• Valve not responding: verify power supply, wiring, connector and control-signal compatibility.
• Flow too low: check inlet/outlet pressure, filters, valve sizing and piping restrictions.
• Flow too high: verify calibration, controller limits and setpoints.
• Unstable flow: inspect supply pressure stability, air in line, contamination, viscosity changes or noisy control signals; consider closed-loop feedback.
• Valve sticking: inspect and clean internal parts; check for deposits or abrasive particles.
• Abnormal leakage: check seals, connections and internal seating surfaces.
• Delayed response: check electrical signal integrity, actuator condition, fluid viscosity and pressure differential.
• Thermal issues: ensure ambient temperature, duty cycle and electrical load are within rated limits.

Caractéristiques / spécifications techniques

• Brand: Weilong
• Model Number: WL 5208
• Rated Voltage (V): DC12V or 24V
• Rated Power (W): 7.2W
• Work Mode: Air Control Valve
• Working Pressure (MPa): 0.2 MPa
• Airflow Rate: 11-48 L/minute
• Reset Time(s): 1 S On, 1 S Off
• Service Life: 200 Thousand Times
• Certification: CE, ROHS, ISO9001
• Material: Superior Magnet Iron
• Lead Wire Length (mm): 200 MM
• Install Style: Screw
• Tolerance of Dimension: ± 0.1 MM
• Water-proof: None
• Insulation Class: B
• Hi-Pot Test: AC 750V 50/60Hz 2s
• Non-excitation Holding Force: 0
• Working Temperature: -10°C to 90°C
• Duty Cycle: 1-100%
• Thread Depth (mm): /
• Payment Term: TT, or LC at Sight
• Sample Order: Yes
• Warranty: 1 Year
• MOQ: 1000 pcs
• Supply Ability: 5000 pcs per week
• Delivery Time: 30 Days
• Port of Loading: Shenzhen