YOULI SN-3/7S-4/28L/28L/28L/18L/18L High Performance Multiple Control Valve Bank
The YOULI SN-3/7S-4/28L/28L/28L/18L/18L High Performance Multiple Control Valve Bank represents a sophisticated solution for demanding hydraulic applications. Engineered for precision and durability, this valve bank offers exceptional control and reliability. Its core advantages lie in its modular design, allowing for customization to specific system requirements, and its robust construction, ensuring a long service life even in harsh industrial environments. Key technical parameters include a nominal flow rate of 50 L/min (13 US gpm) and a maximum operating pressure of 315 bar (4600 psi) for parallel or tandem circuits, and 250 bar (3050 psi) for series circuits. The back pressure on the outlet port T is rated at a maximum of 25 bar (360 psi). The fluid temperature range varies from -20°C to 80°C (-4°F to 176°F) with NBR seals, and -20°C to 100°C (-4°F to 212°F) with FPM seals. The operating viscosity range is 15-75 mm²/s (cSt), with a minimum of 12 mm²/s (cSt) and a maximum of 400 mm²/s (cSt). Ambient temperature ranges from -40°C to 60°C (-40°F to 140°F).
Product Specifications
| Parameter | Value |
| :----------------------- | :----------------------------------------------------------------- |
| Model Series | SN-3 |
| Nominal Flow Rate | 50 L/min (13 US gpm) |
| Max. Operating Pressure | 315 bar (4600 psi) (Parallel/Tandem Circuit) |
| | 250 bar (3050 psi) (Series Circuit) |
| Max. Back Pressure (T) | 25 bar (360 psi) |
| Fluid Temp. (NBR Seals) | -20°C to 80°C (-4°F to 176°F) |
| Fluid Temp. (FPM Seals) | -20°C to 100°C (-4°F to 212°F) |
| Viscosity Operating Range| 15-75 mm²/s (15-75 cSt) |
| Viscosity Min. | 12 mm²/s (12 cSt) |
| Viscosity Max. | 400 mm²/s (400 cSt) |
| Ambient Temp. Range | -40°C to 60°C (-40°F to 140°F) |
Core Features & Market Positioning
The YOULI SN-3/7S-4/28L/28L/28L/18L/18L valve bank is positioned as a high-performance, versatile control solution for complex hydraulic systems. Its sectional design allows for the precise configuration of multiple control elements within a single unit, significantly reducing plumbing complexity and potential leak points. This modularity, combined with a range of available spool options and circuit valves, positions the SN-3 series as a highly adaptable component in various industrial and mobile equipment applications. The integration of independent load check valves in each section and optional port reliefs further enhances its market appeal by offering superior control and safety features. The brand's commitment to professional quality and customer satisfaction, honed over decades of hydraulic valve manufacturing, underpins its strong market presence.
Key Application Scenarios
This high-performance multiple control valve bank is ideally suited for applications demanding precise hydraulic actuation and control. Its versatility makes it a prime choice for construction machinery, such as excavators and loaders, where multiple functions need to be managed simultaneously. It is also extensively used in agricultural equipment, refuse trucks, drilling rigs, and special-purpose vehicles requiring complex hydraulic circuit management. The ability to configure numerous working sections (up to 12 in some SN series models) and choose from various operation methods (manual, pneumatic, hydraulic, electro-hydraulic) makes the SN-3 series adaptable to a wide spectrum of operational needs in both industrial and mobile hydraulics.
Practical System Integration Guidance
Integrating the YOULI SN-3/7S-4/28L/28L/28L/18L/18L valve bank into a hydraulic system involves careful consideration of the ordering code to ensure all functional requirements are met. The model number itself, such as SN-3/7S-4/28L/28L/28L/18L/18L, deciphers key configurations: "SN-3" denotes the series, "7S-4" may indicate specific control options and port configurations, while "28L" and "18L" specify the types of working sections (e.g., standard following section and first section, respectively). The inlet cover typically includes a main pressure relief valve (designated by '3'), and various spool options are available, including those with A and B closed in neutral, A and B open to tank, or single-acting configurations. Proper port selection (e.g., G-3-4 for BSP ports) and outlet cover configuration are also critical. For detailed wiring and electro-hydraulic control kit installations, consult the specific control kit documentation provided by YOULI, such as the 8ED3+RV-KE7R3 for ON/OFF Electro-Hydraulic control.
Operation and Risk Mitigation
Safe and efficient operation of the YOULI SN-3 multiple control valve bank relies on adherence to recommended operating parameters and proper maintenance. Operating within the specified fluid and ambient temperature ranges, and maintaining fluid viscosity within the recommended 15-75 cSt, is crucial for preventing component wear and ensuring consistent performance. The maximum operating pressures for different circuit types (parallel, tandem, series) must not be exceeded to prevent system damage. In case of operational anomalies, standard troubleshooting for hydraulic directional control valves should be applied, focusing on pressure regulation, spool actuation, and potential internal leakage. While specific fault codes are not detailed in the provided data, a systematic approach to diagnosing issues is recommended. Ensuring proper filtration of the hydraulic fluid is paramount to mitigate wear and prevent spool sticking, which can lead to unintended operation or loss of control.
Scalability & Long-Term Value
The inherent modularity of the YOULI SN-3 valve bank provides significant long-term value through scalability and upgradeability. The ability to add or reconfigure working sections allows systems to be adapted to evolving operational demands without necessitating a complete system overhaul. Compatibility with various control methods—manual, pneumatic, hydraulic, and electro-hydraulic—ensures that the valve bank can be integrated into both traditional and increasingly digitized hydraulic control architectures. This flexibility supports integration with IIoT and digital monitoring solutions by providing a reliable and adaptable hydraulic interface. The robust construction and focus on high-accuracy spools hardened for longevity further contribute to the long-term value proposition, minimizing maintenance requirements and maximizing operational uptime.
Frequently Asked Questions
Q1: What is the maximum flow rate for the YOULI SN-3 valve bank?
The nominal flow rate for the YOULI SN-3 valve bank is specified at 50 liters per minute (L/min), which is equivalent to 13 US gallons per minute (US gpm). This flow capacity is suitable for a wide range of industrial and mobile hydraulic applications.
This specification ensures efficient fluid delivery for the intended functions of the hydraulic system. It is important to match this capacity with the overall system's flow requirements to avoid under or over-performance.
Consideration of the viscosity of the hydraulic fluid is also important, as it can affect the actual flow rate and system efficiency. The SN-3 series is designed to operate efficiently within a specific viscosity range.
Q2: What is the maximum operating pressure the YOULI SN-3 valve bank can handle?
The YOULI SN-3 valve bank can handle a maximum operating pressure of 315 bar (4600 psi) for parallel or tandem circuits. For series circuits, the maximum operating pressure is 250 bar (3050 psi).
These pressure ratings ensure the valve bank's integrity and performance under demanding hydraulic conditions. Exceeding these limits can lead to component damage or system failure.
It is crucial to design the hydraulic system to operate within these specified pressure limits, taking into account potential pressure spikes and safety margins.
Q3: Can the YOULI SN-3 valve bank be used in extreme temperature environments?
Yes, the YOULI SN-3 valve bank is designed to operate within a range of temperatures. With standard NBR seals, it operates from -20°C to 80°C (-4°F to 176°F).
For higher temperature applications, FPM (Viton) seals are available, extending the operational range to -20°C to 100°C (-4°F to 212°F). This flexibility allows for its use in diverse environmental conditions.
The ambient temperature range for operation is also broad, from -40°C to 60°C (-40°F to 140°F), providing suitability for many industrial settings.
Q4: What types of spool configurations are available for the SN-3 series?
The SN-3 series offers a variety of spool configurations to suit different control needs. Common options include spools where both A and B ports are closed in the neutral position, or where they are open to the tank.
Single-acting spools are also available, with either the A or B port closed in the neutral position while the other is plugged. This variety ensures precise control over actuator movements.
Additionally, configurations like a double-acting, 3-position spool with B open to the tank in neutral, or with A open to the tank in neutral, are offered for specific operational requirements.
Q5: How is the YOULI SN-3 valve bank configured for a specific application?
Configuration is achieved through a specific ordering code that defines the number of working sections, inlet/outlet covers, and spool types. For example, SN-3/2S-3/18L/28L/G-3-4/M3 indicates the series, number of sections, inlet cover with relief valve, first and following sections, port type, and outlet cover.
Users must select the appropriate spool symbol and any optional features like port reliefs or specific operating methods (manual, electro-hydraulic, etc.) based on system requirements. This detailed coding ensures a customized valve bank.
Consulting the YOULI product catalog and ordering guide is essential for accurately specifying the desired valve bank configuration.
Q6: What are the benefits of using a sectional directional control valve like the SN-3?
Sectional valves offer a compact construction, reducing overall system size and simplifying plumbing compared to multiple monoblock valves. They also feature a low pressure drop and high efficiency, contributing to better system performance.
The modular design allows for customization, enabling users to select the exact number and type of working sections needed for their application. This also facilitates future scalability and upgrades.
Furthermore, sectional valves often incorporate features like independent load check valves and optional port reliefs for enhanced control and safety.
Q7: What maintenance is required for the YOULI SN-3 valve bank?
Regular maintenance typically involves ensuring the cleanliness of the hydraulic fluid and checking for leaks. Maintaining proper fluid viscosity and operating within specified temperature and pressure limits are key preventive measures.
Periodic inspection of seals for wear or degradation, particularly if operating near the upper temperature limits, is recommended. Prompt replacement of worn seals will prevent fluid loss and performance issues.
While specific service intervals are not detailed, a proactive approach to hydraulic system maintenance, including fluid analysis and component checks, will maximize the longevity and reliability of the SN-3 valve bank.
Q8: Can the SN-3 valve bank be controlled electronically?
Yes, the YOULI SN-3 valve bank supports various operation methods, including electro-hydraulic control. This allows for integration into automated systems and remote control applications.
Specific electro-hydraulic control kits, such as those with ON/OFF pilot operation, are available from YOULI to enable electronic actuation of the valve spools. These kits typically include solenoids and associated piloting components.
Integration with electronic control systems requires proper wiring and voltage supply according to the specifications of the chosen electro-hydraulic control kit.
Q9: What is the maximum back pressure the SN-3 valve bank can withstand?
The maximum allowable back pressure on the outlet port T for the YOULI SN-3 valve bank is 25 bar (360 psi).
This parameter is important for system design to prevent excessive back pressure that could affect valve performance or damage other system components.
Ensuring that the return line configuration does not create excessive back pressure is critical for optimal operation and longevity of the valve bank.
Q10: Where is the YOULI SN-3 valve bank manufactured?
YOULI hydraulic valves, including the SN-3 series, are manufactured by YOULI Hydraulic Industrial Co., Ltd., based in Taichung City, Taiwan. Youli-America serves as a US distributor for these products.
The company has been a professional manufacturer of hydraulic control valves for several decades, emphasizing quality control and precision manufacturing standards.
YOULI's commitment to quality is reflected in its ISO 9001 certification and decades of experience in the hydraulic industry.
