YOULI SN-4/3S-3/18L/18L/26-1L/G446 Compact Multiple Hydraulic Control Valve

The YOULI SN-4/3S-3/18L/18L/26-1L/G446 is a compact multiple hydraulic control valve engineered for robust performance in demanding industrial applications. It offers a nominal flow rate of 80 L/min (21 US GPM) and can handle an operating pressure of up to 315 bar (4600 psi). Key advantages include its modular sectional design, allowing for customization and scalability, and an integrated main pressure relief valve for system protection. This valve excels in applications requiring precise hydraulic control and durability.

Product Specifications

| Parameter                | Value                                                                          |

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

| Model                    | SN-4/3S-3/18L/18L/26-1L/G446                                                   |

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

| Maximum Operating Pressure | 315 bar (4600 psi)                                                      |

| Maximum Back Pressure (T) | 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 [-40°F to 140°F]                                         |

| Port Type                | G446 (BSP ports)                                                           |

Core Features & Market Positioning

The YOULI SN-4/3S-3/18L/18L/26-1L/G446 distinguishes itself through its sectional construction, enabling configurations tailored to specific hydraulic system requirements. This modularity offers significant advantages in terms of flexibility and future expandability, positioning it as a versatile solution for both standard and custom industrial machinery. The inclusion of an integrated main pressure relief valve (code '3' in the model designation) is a critical feature, providing essential over-pressure protection directly within the valve manifold. YOULI Hydraulic Industrial Co., Ltd. is recognized for its commitment to quality and professional manufacturing standards, evident in their ISO 9001 certification and decades of experience in hydraulic valve production. This focus on reliability and performance underpins the SN-4's market appeal in sectors demanding robust and dependable hydraulic components.

Key Application Scenarios

This compact multiple hydraulic control valve is ideally suited for a wide array of industrial applications where precise fluid power control is paramount. Its versatility makes it a prime choice for mobile hydraulic equipment, such as construction machinery, agricultural implements, and material handling systems, where space and weight are often critical considerations. In industrial settings, the SN-4 series finds utility in machine tools, injection molding machines, and various automated production lines requiring sophisticated hydraulic actuation. The ability to configure multiple sections allows for the simultaneous control of several hydraulic functions, optimizing operational efficiency and system complexity. The G446 designation indicates BSP (British Standard Pipe) ports, which are common in many international industrial markets.

Practical System Integration Guidance

Integrating the YOULI SN-4/3S-3/18L/18L/26-1L/G446 into a hydraulic system involves careful consideration of port connections and component sequencing. The ordering code provides critical information for assembly: "SN-4" denotes the valve series, "3S" indicates the number of working sections, "3" signifies the inlet cover with a main pressure relief valve, "18L" and "26-1L" represent specific working section configurations, and "G446" specifies the BSP port type. When connecting hydraulic lines, ensure all ports are correctly identified (P for pressure, T for tank, A/B for work ports). Proper sealing is essential to prevent leaks; the valve is available with NBR or FPM seals, offering different temperature resistance capabilities. It is recommended to use hydraulic fluid within the specified viscosity and temperature ranges for optimal performance and longevity.

Operation and Risk Mitigation

Safe and effective operation of the YOULI SN-4 valve relies on understanding its control functions and potential failure modes. The valve's spool configurations (e.g., double-acting, single-acting) dictate how hydraulic actuators respond to lever or other actuation inputs. A key safety feature is the integrated main pressure relief valve, which limits system pressure to a safe maximum, protecting components from damage due to overloads or blockages. To mitigate risks, always ensure the system is depressurized before performing maintenance. Regular inspection for leaks, component wear, and fluid contamination is crucial. While specific fault codes are not detailed in the provided documentation, symptoms like sluggish operation, unexpected actuator movement, or system pressure fluctuations typically indicate issues such as spool wear, internal leakage, or problems with the pilot or relief valve functions.

Scalability & Long-Term Value

The inherent modularity of the YOULI SN-4 series offers excellent scalability, allowing users to adapt their hydraulic systems as operational demands evolve. Additional working sections can be incorporated into the valve manifold, expanding the number of controlled hydraulic functions without necessitating a complete system overhaul. This feature significantly enhances the long-term value proposition, as it permits upgrades and modifications to existing equipment. Compatibility with various actuation methods, including manual, pneumatic, and hydraulic, further adds to its flexibility. While direct integration with IIoT or digital solutions isn't explicitly detailed, the robust electromechanical nature of such valves can be interfaced with modern control systems through appropriate sensors and actuators, enabling data acquisition and remote monitoring for predictive maintenance and optimized performance.

Frequently Asked Questions

What is the primary function of the YOULI SN-4/3S-3/18L/18L/26-1L/G446?

This valve acts as a directional control valve, directing hydraulic fluid flow to various actuators. It allows operators to control the movement and operation of hydraulic cylinders and motors. Its multiple sections enable simultaneous control of several functions within a hydraulic system.

What are the main advantages of the SN-4 series sectional valve?

The SN-4 series offers modularity and customization through its sectional design. This allows for configurations tailored to specific application needs. It also features integrated pressure relief valves for system protection.

What industries typically use the YOULI SN-4/3S-3/18L/18L/26-1L/G446?

This valve is commonly found in mobile hydraulics, such as construction and agricultural machinery. It's also used in various industrial automation and machine tool applications. Its robust design suits demanding environments.

Can the flow rate of the SN-4 valve be adjusted?

The nominal flow rate is specified for the valve model, but fine-tuning can often be achieved through system design elements. This includes pressure adjustments on the relief valve and the overall system flow.

What is the significance of the 'G446' designation in the model number?

The 'G446' typically refers to the type and size of the hydraulic ports. In this case, it indicates BSP (British Standard Pipe) threads, a common standard in many industrial markets.

What is the maximum pressure the SN-4 valve can handle?

The YOULI SN-4 valve is rated for a maximum operating pressure of 315 bar (4600 psi). It also has a maximum backpressure limit on the outlet port T of 25 bar (360 psi).

How does the integrated pressure relief valve function?

The pressure relief valve limits the maximum system pressure by diverting excess fluid back to the tank when a set pressure is reached. This prevents over-pressurization and protects the hydraulic components.

What are the different spool options available for the SN-4 valve?

The SN-4 series offers various spool options, including double-acting, single-acting, and spring-centered configurations. These spools determine the valve's operational characteristics and how it controls actuator movement.

What type of hydraulic fluid is recommended for the SN-4 valve?

The valve is designed for use with mineral oil. It operates optimally within a viscosity range of 15-75 cSt at the specified fluid temperature.

How can the SN-4 valve be integrated into a system with safety considerations?

System integration should always prioritize safety. Ensure proper plumbing, pressure regulation via the relief valve, and correct actuator control logic. Regular maintenance checks are vital for continued safe operation.