Direct-operated solenoid valve WL1745

2-wayairfor compressed air

Overview
An air proportional valve (WL7145) is an electronically controlled pneumatic valve that continuously regulates air pressure or flow proportionally to an electrical input (e.g. 0–10 V, 4–20 mA or PWM). Unlike on/off solenoid valves, it uses an electromagnetic actuator to position the spool/poppet for smooth, accurate control suitable for industrial automation, robotics, medical devices and precision manufacturing.

Product Summary
The WL7145 provides proportional control driven by electrical inputs, combining electromagnetic actuation with precise valve mechanics. Key attributes include compact footprint, fast response, high repeatability, low power consumption and extended service life. OEM options cover voltage, pressure range, connectors, mounting and control interfaces.

How It Works
An electrical signal is applied to the coil, generating a magnetic field that moves the armature or plunger and changes the spool/poppet position to regulate the air passage. Models with integrated sensors offer closed-loop electronic feedback to monitor and adjust output pressure continuously for stable regulation under varying loads.

Applications
Used where precise, responsive pneumatic control is required:

• Industrial automation (actuator speed control, cylinder positioning)
• Robotics (pneumatic grippers, motion control)
• Medical devices (ventilators, anesthesia machines, oxygen delivery, lab instruments)
• Packaging machinery (sealing pressure, filling, labeling)
• Semiconductor and cleanroom production (precise clean air control)
• Food processing, printing, laser cutting, environmental test chambers, pneumatic conveying, laboratory/test equipment

Advantages

• Precise pressure and flow regulation
• Fast response and high repeatability
• Lower compressed air consumption
• Reduced mechanical shock and longer equipment life
• Compact design and PLC/automation integration
• OEM customization for application-specific needs

Disadvantages / Considerations

• Higher cost versus standard on/off solenoid valves due to electronic control
• Requires clean, dry compressed air and adequate filtration to maintain accuracy
• Performance depends on input signal quality and controller tuning
• May require calibration at installation and periodic maintenance

Troubleshooting & Maintenance
Check power supply and input signals, inspect compressed air for contamination or moisture, replace clogged filters, check seals and fittings for leaks, clean internal components if contaminated, and calibrate the valve when necessary. Regular preventive maintenance (filter replacement, electrical checks, leak detection, calibration) extends service life and ensures stable operation.

Product Datasheet - key fields

• Brand: Weilong
• Model Number: WL7145
• Rated Voltage (V): DC12V or 24V
• Rated Power (W): 2 W
• Work Mode: Air Control Valve
• Working Pressure (MPa): 0.2 MPa
• Air-flow Rate: 0–0.5 L per minute
• Reset Time (s): 1 s ON, 1 s OFF
• Service Life: 200,000 cycles
• 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 600V 50/60Hz 2 s
• Non-excitation Holding Force: 0
• Working Temperature: -10°C to 100°C
• Duty Cycle: 1–100%
• 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

Notes
Closed-loop models with integrated feedback improve precision and stability under varying loads. OEM customization is available for voltage, pressure ranges, connectors, materials, port sizes, mounting and protection ratings.