YOULI SN-4/8S-3/28L/28L/28L/18L/18L/18L High Density Multiple Control Valve Block

The YOULI SN-4/8S-3/28L/28L/28L/18L/18L/18L High Density Multiple Control Valve Block is a sophisticated hydraulic component designed for demanding industrial applications. This valve block offers exceptional control and flexibility, integrating multiple directional control functions into a single, compact unit. Its high-density configuration maximizes functionality while minimizing space requirements, making it ideal for systems where space is at a premium. The SN-4 series is engineered for robust performance, featuring high flow rates and pressure capabilities, ensuring reliable operation under strenuous conditions. The adaptable design allows for a customizable number of work sections, tailored to specific application needs.

Product Specifications

| Parameter           | Value                                                                 |

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

| Model               | SN-4/8S-3/28L/28L/28L/18L/18L/18L                                     |

| Nominal Flow Rate   | 80 L/min (21 US gpm)                                                  |

| Max. Operating Pressure | 315 bar (4600 psi)                                    |

| Max. Back Pressure (T Port) | 25 bar (360 psi)                                      |

| Fluid Temperature Range | -20°C to 80°C (NBR seals), -20°C to 100°C (FPM seals)                |

| Viscosity Range     | 15-75 cSt (operating), 12 cSt (min), 400 cSt (max)                    |

| Ambient Temperature Range | -40°C to 60°C                                                         |

| Construction        | Sectional                                                             |

| Inlet Cover Options | Main pressure relief valve (standard), optional inlet relief valves     |

| Working Sections    | Customizable (e.g., 8 sections in this model)               |

| Section Types       | 18L (1st section), 28L (following section)                            |

| Port Options        | BSP ports (G-4-6)                                                     |

| Outlet Cover Options| Standard outlet cover (M3)                                            |

Core Features & Market Positioning

The YOULI SN-4/8S-3/28L/28L/28L/18L/18L/18L stands out in the industrial hydraulic market due to its high-density design, offering a significant number of control functions within a compact footprint. This makes it a highly competitive solution for applications demanding sophisticated hydraulic control without compromising on space. Its robust construction and high-pressure rating of 315 bar (4600 psi) position it as a reliable choice for heavy-duty industrial and mobile machinery. The integrated main pressure relief valve in the inlet cover simplifies system design and reduces the need for external components. Furthermore, the availability of various spool options, A-side and B-side options, and optional port reliefs provides extensive customization capabilities to meet precise application requirements. YOULI's commitment to quality, evidenced by its ISO 9001 certification and decades of experience in hydraulic valve manufacturing, reinforces its market position as a provider of professional-grade, durable hydraulic solutions.

Key Application Scenarios

This high-density multiple control valve block is exceptionally well-suited for a wide array of industrial and mobile hydraulic systems. Its versatility makes it a prime candidate for applications such as construction equipment, where precise and simultaneous control of multiple functions is critical, like excavators and loaders. Agricultural machinery, including harvesters and tractors, benefits from its ability to manage complex hydraulic operations efficiently. In material handling and lifting equipment, such as cranes and forklifts, the SN-4 ensures smooth and controlled movements. Furthermore, it is an ideal component for specialized industrial machinery, including injection molding machines, machine tools, and waste management vehicles like garbage trucks, where compact integration of multiple control valves is essential for optimal performance and space utilization.

Practical System Integration Guidance

Integrating the YOULI SN-4/8S-3/28L/28L/28L/18L/18L/18L involves careful consideration of manifold mounting and port connections. The valve block typically utilizes sub-plate mounting for secure installation. The "SN-4 / 2S - 3 / 18L / 28L / G-4-6 / M3" model designation signifies: 2S for the number of working sections, 3 for the inlet cover with a main pressure relief valve, 18L for the first complete working section, 28L for subsequent complete working sections, G-4-6 for BSP ports, and M3 for the outlet cover. When configuring the system, selecting the appropriate spool options is crucial for defining the actuator's behavior (e.g., double-acting, single-acting, float). Options for manual, pneumatic, hydraulic, or electro-hydraulic actuation are available, demanding corresponding control input and power supply. Proper plumbing of the P (pressure), A and B (work ports), and T (tank) ports to the hydraulic power unit and actuators is essential for correct operation.

Operation and Risk Mitigation

Operating the YOULI SN-4 valve block requires adherence to specified pressure and flow limits to prevent component damage and ensure safety. The maximum operating pressure is 315 bar (4600 psi), and the maximum back pressure on the T port is 25 bar (360 psi). It is crucial to use hydraulic fluid within the recommended viscosity and temperature ranges. Overheating can degrade seals (NBR seals are rated up to 80°C, FPM up to 100°C) and affect fluid performance. For risk mitigation, ensure all connections are secure and leak-free. Utilize the integrated main pressure relief valve or select optional inlet relief valves (e.g., SG-2, SG-3, SG-4) to protect the system from over-pressurization. Regular inspection for leaks, wear, and proper spool actuation is recommended. Faulty spool movement or external leakage are common indicators of potential issues that require immediate attention.

Scalability & Long-Term Value

The YOULI SN-4 series offers inherent scalability through its sectional design, allowing for the addition or removal of working sections to adapt to evolving system requirements. This modularity ensures long-term value by enabling configurations to be modified rather than replaced, reducing obsolescence. Compatibility with various hydraulic power units and actuators is a given, as it adheres to standard hydraulic principles. While direct integration with IIoT and digital solutions is not explicitly detailed in the provided specifications, the availability of electro-hydraulic actuation options hints at future potential for integration with digital control systems. By selecting appropriate electro-hydraulic spools and control interfaces, the SN-4 can be incorporated into more automated and data-driven hydraulic systems, enhancing its long-term relevance in the evolving landscape of industrial automation.

Frequently Asked Questions

1. What is the maximum operating pressure of the YOULI SN-4/8S-3/28L/28L/28L/18L/18L/18L valve block?

The YOULI SN-4/8S-3/28L/28L/28L/18L/18L/18L high-density multiple control valve block is designed to operate at a maximum pressure of 315 bar. This high-pressure capability ensures its suitability for demanding industrial applications.

This impressive pressure rating allows the valve block to handle significant hydraulic loads reliably and efficiently. It is engineered to maintain performance integrity even under strenuous operational conditions.

Exceeding this pressure limit can lead to component failure, leakage, and potential safety hazards. Therefore, system design must incorporate pressure regulation and relief mechanisms to stay within these operational parameters.

2. How many working sections can the SN-4 valve block accommodate?

The SN-4 series is highly modular and can accommodate a variable number of working sections. The specific model, SN-4/8S-3/..., indicates it is configured with eight working sections.

This sectional design provides significant flexibility, allowing users to customize the valve block precisely to their application's functional requirements. More or fewer sections can be ordered based on project needs.

This adaptability makes the SN-4 series a scalable solution, capable of growing or changing with system demands over time, enhancing its long-term value and reducing the need for complete system overhauls.

3. What are the typical applications for the YOULI SN-4 valve block?

This valve block is widely used in heavy-duty industrial and mobile hydraulic systems. Common applications include construction machinery and agricultural equipment.

It is also a popular choice for material handling equipment like cranes and forklifts, as well as various industrial vehicles. Its compact, high-density design is ideal for space-constrained applications.

Furthermore, the SN-4 series finds utility in specialized areas such as waste management vehicles and other hydraulic systems requiring multiple, precise control functions.

4. What types of actuation methods are available for the SN-4 valve block?

The YOULI SN-4 valve block offers a range of actuation methods to suit different control system designs. These include manual, pneumatic, hydraulic, and electro-hydraulic actuation options.

The availability of diverse actuation methods allows for seamless integration into existing control infrastructures. This flexibility is key for retrofitting or designing new systems with specific control interfaces.

Choosing the correct actuation method is critical for system operation and requires appropriate electrical or pneumatic interfaces for the chosen control inputs.

5. What is the nominal flow rate for the SN-4 valve block?

The nominal flow rate for the YOULI SN-4 valve block is rated at 80 liters per minute (L/min). This is equivalent to approximately 21 US gallons per minute (US gpm).

This flow rate capacity ensures efficient hydraulic power delivery for a wide range of applications. It is a key parameter for system sizing and performance calculations.

It's important to note that while 80 L/min is the nominal rate, the system's actual flow may vary based on circuit design, pressure drops, and component limitations.

6. Can the YOULI SN-4 valve block be customized with different spool options?

Yes, the SN-4 valve block offers extensive customization through various spool options. These spools determine the valve's flow patterns and functions.

Users can select from a range of spools, including those for double-acting cylinders, single-acting cylinders, float positions, and motor spools. This allows for precise control over actuators.

Customization extends to features like detents, spring centering, and specific port configurations, enabling the valve to be tailored to unique operational demands.

7. What is the significance of the "18L" and "28L" in the SN-4 model number?

The "18L" typically denotes the first working section of the valve block, which might have specific characteristics or configurations. The "28L" designation usually refers to subsequent or standard following working sections.

These designations help in identifying the exact type and function of each section within the assembled valve block. They are part of the ordering code that defines the valve's precise configuration.

Understanding these notations is crucial for accurate ordering, replacement, and system integration, ensuring that the correct components are specified for the intended hydraulic circuit.

8. What are the temperature and viscosity limitations for the hydraulic fluid used with the SN-4 valve block?

The SN-4 valve block has specific fluid compatibility requirements to ensure optimal performance and longevity. With standard NBR (Buna-N) seals, the fluid temperature range is -20°C to 80°C.

For higher temperature applications, FPM (Viton) seals can be specified, extending the operational temperature range to -20°C to 100°C. The recommended fluid viscosity range is 15 to 75 cSt.

It is important to maintain the fluid within these parameters to prevent seal degradation and ensure consistent valve operation. Minimum viscosity is 12 cSt and maximum is 400 cSt.

9. Does the YOULI SN-4 valve block include integrated pressure relief valves?

Yes, the "3" in the model designation (e.g., SN-4/8S-3/...) indicates that the inlet cover includes a main pressure relief valve as a standard feature. This integrated relief valve protects the hydraulic system from over-pressurization.

Additionally, optional inlet relief valves (like SG-2, SG-3, SG-4) and port relief valves are available for further customization and system protection. These can be specified during ordering to meet specific pressure control needs.

The presence of these relief functions simplifies system plumbing and reduces the need for external components, contributing to a more compact and cost-effective hydraulic solution.

10. What type of mounting does the SN-4 valve block use?

The YOULI SN-4 sectional directional control valves are designed for sub-plate mounting. This mounting style facilitates easy installation and maintenance by allowing the valve to be bolted onto a manifold or mounting plate.

Sub-plate mounting ensures a secure and stable connection, which is critical for high-pressure hydraulic systems. It also simplifies the process of replacing or reconfiguring valve sections.

This mounting method is standard for sectional valves, providing a robust foundation for the modular assembly of multiple control sections.