Direct-operated solenoid valve WL109531

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Product Summary
An SCR solenoid valve for automotive Selective Catalytic Reduction (SCR) systems, model WL109531 by Weilong Technology, designed to meter Diesel Exhaust Fluid (DEF/AdBlue) into the exhaust stream. Intended for heavy-duty diesel applications, it converts electrical input to mechanical valve action and is built for high temperatures, vibration and outdoor environments.

Key Features

• Electromagnetic actuation for fast response and accurate DEF flow control.
• Materials selected for high temperature and corrosion resistance (copper coil, stainless steel plunger, heat-resistant housing).
• Sealing design and construction for extended service life and continuous-duty reliability.
• Low power consumption; waterproof and dustproof options; anti-vibration design for vehicle use.
• Compact, flange-mount design; available in OEM and customizable variants.

Product Overview
The WL109531 provides precise dosing for DC12V and DC24V systems with switching optimized for low energy use. It offers variable sizes, flow rates, duty cycles, mounting options and connector specifications to support both OEM integration and aftermarket replacement in trucks, buses and industrial engines.

Applications

• DEF/AdBlue metering in SCR systems
• Heavy-duty trucks and commercial buses
• Construction and agricultural machinery
• Industrial diesel generators and mobile equipment

Working Principle
The solenoid receives a pulse signal from the vehicle ECU and opens/closes rapidly to meter a controlled volume of DEF into the exhaust, enabling the catalytic reduction of NOx to N2 and H2O.

Advantages & Disadvantages

• Advantages: precise injection, fast response, low power draw, compact integration, durable with correct materials; contributes to emissions compliance.
• Disadvantages: sensitive to DEF quality and crystallization; requires upstream heating in cold climates; SCR systems increase system complexity and maintenance needs.

Troubleshooting - Common Faults & Remedies

• No actuation: verify supply voltage, coil resistance, wiring and ECU signal.
• Injection failure: inspect for sticking valve, crystallization, clogged filter/nozzle or low supply pressure; clean or replace components and check pump performance.
• Slow response: check for contamination, damaged plunger or voltage instability; clean internals, replace worn parts and stabilize voltage.
• Overheating: confirm voltage rating and duty cycle; replace damaged coil insulation if present.
• Leaks: check seals, fittings and housing; replace seals, tighten fittings or repair housing and adjust system pressure.

Product Datasheet (key rows)
Brand: Weilong Technology
Model Number: WL109531
Rated Voltage (V): DC12V or 24V
Rated Power (W): 10-15W
Working Pressure: 0.01–0.3 mPa
Port Gate: 10 mm
Stroke (mm): 3–6 mm (customizable)
Reset Time (s): 1 s ON / 3 s OFF
Service Life: ~200,000 cycles
Certification: CE, RoHS, ISO9001
Material: valve copper (coil copper, stainless plunger)
Lead Wire Length (mm): 200 mm
Install Style: Flange
Tolerance of Dimension: +/- 0.1 mm
Water-proof: None
Insulation Class: B
Hi-Pot Test: AC 600V 50/60Hz 2s
Non-excitation Holding Force: 0
Working Temperature: -10°C to 100°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

FAQ - Selected

• What does an SCR solenoid valve do? It meters AdBlue/DEF into the exhaust stream by opening and closing to initiate NOx reduction.
• Why and how does an SCR solenoid fail? Common causes include crystallization/clogging, corrosion, electrical faults or mechanical contamination.
• Can clogged SCR solenoid valves be cleaned? Light crystallization can sometimes be removed with hot water or ultrasonic cleaning; damaged seals or electronics require replacement.
• Is valve heating required? Valves are usually located in hot exhaust areas; DEF thawing must be handled upstream via heated lines or supply modules in cold climates.