YOULI SN-3/11S Hydraulic Multiple Control Valve
The YOULI SN-3/11S Hydraulic Multiple Control Valve represents a sophisticated solution for demanding hydraulic systems, offering a blend of robust performance and versatile control. This sectional directional control valve is engineered for reliability and efficiency, making it a preferred choice in various industrial and mobile applications. Its design prioritizes a low pressure drop and long service life, attributes stemming from its high-accuracy, hardened spool and overall compact construction. The SN-3/11S accommodates diverse operational needs through multiple actuation methods, including manual, pneumatic, hydraulic, and electro-hydraulic controls, providing flexibility for system integration.
Product Specifications
| Parameter | Specification |
| :------------------------ | :-------------------------------------------------------------------------------- |
| Nominal Flow Rate | 50 L/min (13 US gpm) |
| Maximum Operating Pressure | 315 bar (4600 psi) for parallel or tandem circuits; 250 bar (3050 psi) for series circuits |
| Maximum Back Pressure (Port T) | 25 bar (360 psi) |
| Fluid Temperature Range | -20°C to 80°C (-4°F to 176°F) with NBR seals; -20°C to 100°C (-4°F to 212°F) with FPM seals |
| Viscosity Operating Range | 15-75 mm²/s (15-75 cSt); Minimum 12 mm²/s (12 cSt), Maximum 400 mm²/s (400 cSt) |
| Ambient Temperature Range | -40°C to 60°C (-40°F to 140°F) |
Core Features & Market Positioning
The YOULI SN-3/11S is positioned as a high-quality, professional-grade directional control valve, leveraging YOULI Hydraulic's decades of experience in hydraulic valve manufacturing since 1975. Key differentiators include its hardened spool for sustained accuracy and durability, a compact design that facilitates integration into space-constrained systems, and a low pressure drop that enhances energy efficiency. The availability of various circuit types and port configurations further solidifies its adaptability in the market. Its robust construction and reliable performance make it suitable for demanding environments where precision and longevity are paramount, distinguishing it from less durable alternatives.
Key Application Scenarios
The versatility of the YOULI SN-3/11S makes it applicable across a broad spectrum of industries. It is commonly found in construction machinery, sanitation vehicles, drilling equipment, and other specialized vehicles due to its ability to precisely control hydraulic functions. Mobile hydraulic applications benefit significantly from its sectional design, allowing for customized configurations to meet specific operational requirements, such as those in hook loaders. Furthermore, its suitability for both industrial and mobile hydraulic systems underscores its broad market appeal and utility in applications demanding reliable directional flow control.
Practical System Integration Guidance
Integrating the YOULI SN-3/11S into a hydraulic system involves careful consideration of its multiple control options and circuit configurations. The valve's sub-plate mounting design simplifies installation, while the availability of various spool functions (e.g., A, O, Y, P) and circuit types (parallel, series-parallel) allows for tailored system design. For electro-hydraulic control, specific ON/OFF electro-hydraulic control kits with pilot and drain lines are available. Proper system flushing and clean hydraulic fluid are crucial for optimal performance and to prevent spool stiction, especially when using mineral oil with specific viscosity and temperature ranges. Always ensure that all connections are secure and that the system operates within the specified pressure and flow parameters to avoid premature wear or failure.
Operation and Risk Mitigation
Safe operation of the YOULI SN-3/11S relies on understanding its pressure limits and proper system maintenance. The maximum operating pressures for parallel/tandem circuits are 315 bar, and for series circuits, it's 250 bar. Exceeding these limits can lead to component damage or system malfunction. Hydraulic fluid contamination is a primary cause of valve issues, including spool stiction, which can impair the actuator's movement. Regular inspection of hydraulic fluid, filters, and ensuring correct fluid viscosity and temperature are vital risk mitigation strategies. In the event of operational anomalies, a systematic troubleshooting approach, starting with electrical connections and fluid conditions before disassembling the valve, is recommended.
Scalability & Long-Term Value
The sectional nature of the YOULI SN-3/11S is a key factor in its long-term value and scalability. The ability to configure the valve with multiple sections (up to 6 for SN-3 series, and more for other SN series models) allows systems to grow or adapt to new requirements without necessitating a complete valve replacement. This modularity ensures compatibility with evolving hydraulic circuit demands. While direct integration with IIoT or advanced digital solutions is not explicitly detailed for this specific model, its robust and adaptable design forms a solid foundation for systems that may incorporate smart controls or monitoring in the future, offering a sustainable investment for complex hydraulic applications.
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Frequently Asked Questions (FAQs)
What is the maximum operating pressure for the YOULI SN-3/11S valve?
The YOULI SN-3/11S hydraulic multiple control valve is designed for high-pressure applications. It can operate up to a maximum of 315 bar (4600 psi) when configured in parallel or tandem circuits. For series circuit configurations, the maximum operating pressure is rated at 250 bar (3050 psi).
It is crucial to adhere to these pressure ratings to ensure the longevity and safe operation of the valve and the entire hydraulic system. Exceeding these limits can lead to premature wear, internal leakage, or catastrophic failure of the valve components.
Always ensure your system's pressure regulation components are properly set and functioning to maintain pressures within these specified maximums, safeguarding both equipment and personnel.
What types of hydraulic fluids are compatible with the SN-3/11S?
The SN-3/11S valve is compatible with mineral oils within a specific viscosity range. The recommended operating viscosity is between 15-75 mm²/s (cSt), with a minimum of 12 mm²/s and a maximum of 400 mm²/s. Using fluids outside this range can affect valve performance and lifespan.
The valve is available with different seal materials to accommodate various fluid types and temperatures. NBR seals are suitable for temperatures from -20°C to 80°C, while FPM (Viton) seals extend this range to -20°C to 100°C.
It's essential to consult the specific hydraulic fluid manufacturer's recommendations and ensure compatibility with the chosen seal material for optimal performance and reliability.
Can the YOULI SN-3/11S valve be used in both mobile and industrial applications?
Yes, the YOULI SN-3/11S is engineered for versatility and is widely utilized in both mobile and industrial hydraulic systems. Its robust design and performance characteristics make it suitable for demanding environments found in construction machinery, agricultural equipment, and manufacturing processes.
The sectional design allows for customization, enabling users to configure the valve with the necessary number of sections and functions for specific tasks, whether on a tractor or a factory floor. This adaptability ensures it can meet the diverse control requirements across various sectors.
Its specifications, such as high operating pressure and flow rates, are well-suited for the power demands of both mobile equipment and industrial machinery.
