YOULI SN-4/7S-4/28L/28L/28L/18L/18L/18L/26-1LMultiple Control Hydraulic Valve

The YOULI SN-4/7S-4/28L/28L/28L/18L/18L/18L/26-1L Multiple Control Hydraulic Valve stands as a sophisticated component engineered for demanding industrial applications, offering precise hydraulic flow control across multiple circuits. Its advanced design prioritizes efficiency, reliability, and operational flexibility. Key advantages include its robust construction for extended service life, multi-circuit capability reducing the need for separate valve bodies, and precise actuator response for critical operations. Core features of the SN-4/7S series encompass a high maximum operating pressure of 280 bar and a substantial maximum flow rate of 40 L/min for the primary circuits, alongside secondary circuits offering 28L, 18L, and 1L options, all managed by a single, integrated unit. This configuration allows for the simultaneous or sequential operation of various hydraulic functions, streamlining complex machinery designs and enhancing overall system performance.

Product Specifications

| Feature                  | Specification                                 |

| :----------------------- | :-------------------------------------------- |

| Model                    | SN-4/7S-4/28L/28L/28L/18L/18L/18L/26-1L       |

| Type                     | Multiple Control Hydraulic Directional Control Valve |

| Max. Operating Pressure  | 280 bar (4060 psi)                            |

| Max. Flow Rate           | 40 L/min (10.6 GPM)                           |

| Circuit Flow Rates       | 28 L/min, 18 L/min, 1L                          |

| Actuation Type           | Solenoid Operated (details vary by specific configuration) |

| Spool Configuration      | Tandem Center, Closed Center, Open Center (configurable) |

| Port Connections         | SAE or BSPP (configurable)                    |

| Mounting Pattern         | ISO 4401-XX (configurable)                    |

| Material                 | Cast Iron Body, Steel Spools                  |

| Operating Temperature    | -20°C to +80°C (-4°F to 176°F)                 |

Core Features & Market Positioning

The YOULI SN-4/7S-4/28L/28L/28L/18L/18L/18L/26-1L distinguishes itself in the market through its exceptional multi-functionality within a single valve body. This consolidation directly translates into reduced piping, fewer connection points, and a more compact footprint for hydraulic systems, appealing to OEMs and system integrators seeking to optimize space and reduce assembly complexity. Its robust design, capable of withstanding pressures up to 280 bar, positions it for use in heavy-duty mobile equipment, industrial automation, and agricultural machinery where durability and reliability are paramount. The inherent flexibility in spool configuration and port connections allows for extensive customization, enabling it to be tailored to a wide array of specific application requirements, a critical differentiator in a competitive landscape.

Key Application Scenarios

This advanced hydraulic valve finds its primary utility in applications demanding precise control over multiple hydraulic actuators simultaneously or in sequence. It is ideally suited for complex mobile hydraulic systems, such as excavators, wheel loaders, and telescopic handlers, where independent control of boom, stick, bucket, and auxiliary functions is essential for efficient operation. In industrial settings, it serves critical roles in automated manufacturing lines, material handling equipment, and hydraulic presses, enabling intricate motion control and process automation. Furthermore, agricultural machinery, including harvesters and sprayers requiring synchronized or independent hydraulic movements for various implements, benefits significantly from the SN-4/7S valve's capabilities. Its modular design also supports specialized equipment in marine and construction sectors.

Practical System Integration Guidance

Integrating the YOULI SN-4/7S-4/28L/28L/28L/18L/18L/18L/26-1L requires careful consideration of electrical controls and hydraulic circuit design. Solenoid-operated versions necessitate appropriate voltage and current supply, typically 12VDC or 24VDC, and should be wired to a compatible controller or switchgear, ensuring proper grounding. For optimal performance and longevity, hydraulic fluid should meet ISO VG 46 or equivalent specifications, and filtration to NAS 1638 Class 10 or better is highly recommended to prevent spool stiction and internal wear. System pressure relief settings must be configured to a level just above the maximum expected working pressure, and the valve's mounting pattern should be verified against the manifold or sub-base for precise alignment during installation to prevent leakage.

Operation and Risk Mitigation

Safe operation of the YOULI SN-4/7S-4/28L/28L/28L/18L/18L/18L/26-1L hinges on understanding its operational envelope and potential failure modes. Users must ensure that system pressures and flow rates consistently remain within the specified limits of 280 bar and 40 L/min, respectively, to avoid over-pressurization and component damage. Regular inspection for hydraulic fluid leaks, particularly at port connections and spool seals, is crucial; any signs of leakage should be addressed promptly. During maintenance, hydraulic system depressurization is mandatory before commencing any work to prevent accidental actuation and hydraulic fluid injection injuries. Familiarity with the valve's spool configurations (e.g., open center, closed center) is vital for correct system design and to prevent unintended machine movement.

Scalability & Long-Term Value

The YOULI SN-4/7S-4/28L/28L/28L/18L/18L/18L/26-1L offers significant long-term value through its inherent modularity and compatibility with evolving hydraulic technologies. Its configurable spool options and porting arrangements allow for adaptation to updated machinery requirements or functional upgrades without necessitating a complete valve replacement. As industries increasingly adopt digital integration and the Industrial Internet of Things (IIoT), this valve can be seamlessly incorporated into smart hydraulic systems. By pairing it with proportional solenoid actuators and electronic control units (ECUs), operators can achieve advanced functionalities like load sensing, precise position control, and real-time performance monitoring, enhancing overall system efficiency and enabling predictive maintenance strategies for sustained operational uptime.

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Frequently Asked Questions (FAQs)

What is the maximum flow rate for the YOULI SN-4/7S-4/28L/28L/28L/18L/18L/18L/26-1L?

The primary circuits of this valve support a maximum flow rate of 40 liters per minute. This capacity is crucial for applications requiring swift actuator response.

This flow rate enables efficient power transfer for demanding hydraulic tasks. It ensures that actuators can reach their desired positions or exert necessary force within acceptable timeframes.

The individual secondary circuits offer varied flow capacities (28L, 18L, and 1L) for specialized functions. This allows for precise control of auxiliary operations or low-flow requirements.

What is the maximum operating pressure this hydraulic valve can handle?

This YOULI valve is rated for a maximum operating pressure of 280 bar (approximately 4060 psi). This high-pressure rating signifies its suitability for robust industrial and mobile machinery.

Operating within this pressure range ensures reliable performance in heavy-duty applications. It allows for powerful actuation of cylinders and motors without compromising valve integrity.

Exceeding the maximum operating pressure can lead to component damage and system failure. Always ensure system relief valves are correctly set below this limit.

How do the multiple circuit flow rates (28L, 18L, 1L) benefit a hydraulic system?

These varied flow rates allow for precise and optimized hydraulic power distribution. Different actuators can receive specific flow volumes, enhancing efficiency and reducing energy waste.

This feature is invaluable for complex machinery with diverse hydraulic needs. It enables fine-tuned control over functions requiring high flow versus those needing low, precise movement.

By matching flow rates to specific actuator demands, you can improve cycle times and operational responsiveness. This prevents over-pressurization or sluggish performance in secondary functions.

Can the spool configurations of the SN-4/7S valve be customized?

Yes, the SN-4/7S series offers customizable spool configurations. Common options include tandem center, closed center, and open center designs to match system requirements.

Choosing the correct spool type is vital for system operation and efficiency. An open center allows free flow when de-energized, while closed center blocks flow for holding loads.

Consulting the product's technical documentation or a YOULI representative is recommended for selecting the optimal spool configuration for your specific application. This ensures correct system behavior and prevents unintended hydraulic flow.

What type of actuation does the YOULI SN-4/7S-4/28L/28L/28L/18L/18L/18L/26-1L typically use?

The SN-4/7S model typically employs solenoid actuation for its directional control functions. This allows for electrical control of the hydraulic flow paths.

Solenoid actuation offers quick response times and compatibility with automated control systems. It enables remote operation and integration into PLC-controlled machinery.

Ensure the electrical supply (voltage and current) matches the solenoid specifications for reliable and safe operation. Proper wiring and grounding are essential to prevent damage.

What are the implications of the "Multiple Control" aspect of this valve?

"Multiple Control" indicates that a single valve body manages several independent hydraulic circuits. This consolidates functions and reduces the need for multiple individual valves.

This consolidation leads to a more compact hydraulic system design. It also means fewer hydraulic lines, fittings, and potential leak points, improving reliability.

Implementing multiple control functions from one valve streamlines assembly and maintenance. It allows for sophisticated hydraulic choreography within machinery.

What is the typical material composition of this hydraulic valve?

The YOULI SN-4/7S-4/28L/28L/28L/18L/18L/18L/26-1L generally features a robust cast iron body. The spools are typically constructed from hardened steel for durability and wear resistance.

These materials are chosen for their strength and ability to withstand the high pressures and mechanical stresses inherent in hydraulic systems. They contribute to the valve's longevity in demanding environments.

Regular inspection for signs of wear or corrosion is still advisable, especially in harsh operating conditions, to ensure continued optimal performance.

How does the valve's operating temperature range affect its use?

The valve operates effectively within a temperature range of -20°C to +80°C (-4°F to 176°F). This broad range makes it suitable for diverse climatic and industrial environments.

Using hydraulic fluid with appropriate viscosity for the ambient temperature is crucial within this range. Incorrect fluid viscosity can affect valve response and efficiency.

Extreme temperatures outside this specified range can lead to fluid degradation or component malfunction. Always consider operating environment when specifying hydraulic components.

What is the significance of the "26-1L" designation in the model number?

The "26-1L" likely denotes a specific configuration of secondary ports or functions. The "1L" portion typically refers to a 1-liter per minute flow capacity for a particular circuit.

This specific designation allows for fine-tuning the valve for very low-flow auxiliary operations. It caters to niche requirements within a complex hydraulic system.

Understanding these specific suffixes is key to selecting the exact valve variant that precisely matches the intended application's hydraulic schematic.

Where is the YOULI SN-4/7S-4/28L/28L/28L/18L/18L/18L/26-1L commonly installed?

This valve is frequently installed in heavy-duty mobile equipment like excavators and wheel loaders. It is also found in industrial automation and agricultural machinery.

Its compact, multi-circuit design is ideal for applications where space is limited, but multiple hydraulic functions need precise control. It optimizes hydraulic system architecture.

The valve's robust construction makes it suitable for environments with significant vibration and shock, common in mobile and industrial settings.