The U2WSL-DA Series Zero Differential Pressure UL Certified Plastic Water Solenoid Valve represents a breakthrough in fluid control technology, combining the trusted durability of German BASF PA66 nylon construction with the flexibility to operate across the complete pressure range from 0 to 8 bar. Unlike conventional pilot-operated solenoid valves that require a minimum pressure differential to function, this direct acting design opens reliably even under zero inlet pressure conditions, making it the ideal solution for gravity-fed systems, low-head irrigation setups, and applications where upstream pressure is inconsistent or absent. With full UL certification for the North American market and CE ROHS compliance for European and Asian territories, this valve delivers both technical performance and regulatory confidence in a single cost-effective package.

• Zero Differential Pressure Operation: The direct acting mechanism eliminates the minimum pressure requirement found in pilot-operated valves, ensuring reliable opening and closing from 0 bar upward with no stalling or sticking at low pressure conditions.
• UL Certified for North America: Full UL listing provides documented compliance with United States and Canadian safety standards, removing certification barriers for distributors, OEMs, and contractors serving the North American market.
• German BASF PA66 Nylon Body: The valve body is injection molded from premium PA66 sourced from BASF Germany, offering exceptional mechanical strength, dimensional stability, and superior corrosion resistance compared to traditional brass or cast iron alternatives at a fraction of the weight.
• IP65 Waterproof Protection: The solenoid coil housing carries an IP65 ingress protection rating, ensuring reliable operation in outdoor environments, washdown areas, and high-humidity installations without risk of electrical failure.
• Dual Voltage Flexibility: Available in AC220V, AC240V, AC110V, AC120V at 50/60Hz as well as DC24V and DC12V configurations, allowing the same valve platform to serve markets across North America, Europe, Asia, and beyond with a single part number family.
• Wide Media Compatibility: Engineered for water, liquid, air, and light oil with viscosity up to 20cst, the NBR sealing system handles medium temperatures from -10°C to 80°C, covering the vast majority of commercial and light industrial fluid control applications.
• Dual Thread Standard Support: Both G thread (BSP) and NPT thread interfaces are available, eliminating the need for adapters and reducing installation complexity in diverse plumbing environments worldwide.
• Energy Saving Coil Option: An ES low power energy saving coil variant reduces power consumption to just AC 4VA and DC 4W for DN10-25 sizes, achieving over 80% energy reduction compared to standard coils while maintaining identical flow performance.

The U2WSL-DA zero differential pressure solenoid valve is purpose-built for installations where inlet pressure cannot be guaranteed. In agricultural drip and sprinkler irrigation systems fed by gravity tanks or low-head reservoirs, the valve opens reliably at near-zero pressure, unlike traditional diaphragm valves that require 0.3 bar minimum differential to actuate. For water purification and RO filtration equipment, the direct acting design provides precise on-off control in low-pressure stages of multi-stage treatment trains, including post-membrane permeate lines where pressure may drop to atmospheric levels during startup and shutdown cycles. In commercial building water management, these valves serve automatic urinal and toilet flushing systems, cooling tower makeup water lines, and HVAC condensate drain control circuits, where the IP65 protection rating ensures longevity in mechanical rooms with fluctuating humidity. The UL certification specifically enables direct specification by US and Canadian OEMs for ice maker water inlet control, coffee and espresso machine brewing systems, and laboratory fluid handling equipment without additional regulatory qualification. For distributors and stockists, the multi-voltage and dual-thread configurability reduces the SKU count required to serve international markets, while the lightweight PA66 body lowers shipping costs compared to brass or stainless steel equivalents.

Every U2WSL-DA solenoid valve undergoes a comprehensive testing protocol before shipment, including high pressure integrity testing at 1.5x rated working pressure, low pressure actuation verification starting from 0 bar, and helium leak detection to confirm seal integrity across the full operating range. The German OXFORD spectrometer validates the PA66 material composition of each production batch to ensure consistency with BASF grade specifications. Individual valves are packed in shockproof bags to protect against transit vibration, then placed in strong export-grade cartons with English neutral packaging. Custom logo printing is available for OEM orders. For shipments exceeding 40 kg, fumigated wooden cases or pallets are provided to meet international phytosanitary requirements. Backed by over 55 years of solenoid valve manufacturing expertise since 1965, Round Star delivers reliable performance with a 3-year warranty on all U2WSL-DA series products. Contact our technical support team for application engineering assistance, sample requests, or volume pricing inquiries.