YOULI MB-4/1S Hydraulic Control Valve
The YOULI MB-4/1S-3/18L/G4/M3 Monoblock Hydraulic Control Valve is a robust and versatile component engineered for demanding mobile and industrial hydraulic applications. This valve offers a compelling combination of compact design, operational simplicity, and reliable performance, making it a preferred choice for professionals in various sectors. Its core advantages lie in its efficient operation, ability to handle significant pressures, and adaptability to different system requirements.
Product Specifications
| Parameter | Specification |
| :--------------------- | :------------------------------------------------------------ |
| Nominal Flow Rate | 60 L/min (16 US GPM) / 80 L/min (21 US GPM) |
| Maximum Operating Pressure | 315 bar (4600 psi) |
| Max Back Pressure | 50 bar (725 psi) / 25 bar (360 psi) |
| Fluid Temperature Range| -20°C to 80°C (with NBR seals) |
| Ambient Temperature Range| -40°C to 60°C |
| Viscosity Range | 12 to 800 mm²/s / 15 to 400 mm²/s |
| Filtration | 10 to NAS 1638 |
| Spool Stroke | +/- 7 mm |
| Actuating Force | < 200 N |
Core Features & Market Positioning
The YOULI MB-4/1S-3/18L/G4/M3 stands out in the market due to its integrated design and user-centric features. It offers a compact, lightweight structure that simplifies handling and installation without compromising performance. A key differentiator is its modularity, allowing for the addition of work sections up to a maximum of seven spools, thereby enhancing system flexibility. The inclusion of primary and secondary relief valves, with adjustable opening pressures, provides crucial overpressure protection tailored to specific operational needs. Furthermore, the valve's series-parallel connection structure and integrated load-holding valves prevent actuator drift under load, ensuring safe and stable operation. Its ability to switch between single and dual pump systems optimizes working efficiency and conserves energy, positioning it as an advanced solution for complex hydraulic circuits.
Key Application Scenarios
This hydraulic control valve is particularly well-suited for specialized mobile equipment where precise control and reliability are paramount. Common applications include truck-mounted cranes, wreckers, scrubbing machines, and compactors. Its robust construction and ability to handle high pressures also make it suitable for various industrial machinery, agricultural equipment, and lifting and transport systems. The versatility of the MB-4/1S series means it can be found in applications requiring multi-functionality and precise hydraulic actuation.
Practical System Integration Guidance
Integrating the YOULI MB-4/1S-3/18L/G4/M3 into existing hydraulic systems is facilitated by its sub-plate mounting capability. The valve is typically secured with two M8 bolts. It offers dual-ported inlets and outlets, allowing for flexible line connections at the top or sides of the valve body. For closed-center systems, a plug can be installed, which also doubles as a power beyond port for future expansion or the addition of secondary valves. The valve supports various actuation methods, including manual, pneumatic, hydraulic, and electro-hydraulic controls, offering significant adaptability for diverse control schemes. Careful attention to fluid cleanliness, adhering to a filtration standard of 10 to NAS 1638, is essential for maintaining optimal performance and longevity.
Operation and Risk Mitigation
Safe operation of the YOULI MB-4/1S hydraulic control valve is supported by its inherent design features, such as load-holding valves that prevent unintended actuator movement. While valves are not designed for absolute sealing, exceeding acceptable internal leakage levels can lead to performance degradation and potential hazards. Sources of internal leakage can include contamination, worn components, or improper setup. Regular maintenance, including proper filtration and adherence to recommended operating parameters for pressure, temperature, and viscosity, is critical for preventing issues like valve sticking caused by contamination or heat-induced oil degradation. Ensuring correct component sizing and application suitability is fundamental to preventing valve failure.
Scalability & Long-Term Value
The MB-4/1S series offers inherent scalability through its modular design, allowing for system expansion by adding work sections up to seven spools. This feature makes it a cost-effective solution for applications that may evolve over time. Furthermore, the availability of power-beyond ports enables the integration of additional valves or hydraulic circuits, enhancing the system's capabilities without requiring a complete overhaul. While specific IIoT integration details are not explicitly stated, the valve's robust design and compatibility with various actuation methods (including electro-hydraulic) suggest it can be incorporated into modern, digitized hydraulic control systems with appropriate interface modules.
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Frequently Asked Questions
1. What is the maximum pressure rating for the YOULI MB-4/1S hydraulic control valve?
The YOULI MB-4/1S hydraulic control valve is rated for a maximum operating pressure of 315 bar (4600 psi) in parallel or tandem circuit configurations. This high-pressure capability ensures its suitability for robust industrial and mobile applications. It is crucial to operate within these limits to maintain valve integrity and system safety.
2. Can the YOULI MB-4/1S accommodate different flow rates?
The nominal flow rate for the YOULI MB-4/1S is typically stated as 60 L/min (16 US GPM), but some specifications indicate up to 80 L/min (21 US GPM). This capacity allows for efficient operation in a range of hydraulic systems. Exceeding the specified flow rate can lead to reduced performance and potential damage.
3. What types of actuation methods are supported by the YOULI MB-4/1S valve?
This valve supports various actuation methods, including manual, pneumatic, hydraulic, and electro-hydraulic controls. This versatility allows system designers to choose the most appropriate control interface for their specific application. Electro-hydraulic control kits are available, offering advanced automation possibilities.
4. How many work sections can be added to a YOULI MB-4/1S valve?
The YOULI MB-4/1S is a monoblock valve that can be configured with multiple work sections, allowing for up to seven spools in some configurations. This modular design provides flexibility for complex hydraulic circuits requiring multiple functions. Additional sections can be added based on application demand.
5. What are the operating temperature limits for the YOULI MB-4/1S?
The valve has an operating fluid temperature range of -20°C to 80°C (with NBR seals) and an ambient temperature range of -40°C to 60°C. Maintaining temperatures within these specified limits is essential for optimal performance and longevity. Extreme temperatures can affect fluid viscosity and seal integrity.
6. What is the importance of filtration for the YOULI MB-4/1S?
Proper filtration is critical for the longevity and reliable operation of the YOULI MB-4/1S valve. It is recommended to maintain a filtration level of 10 to NAS 1638. Contamination in the hydraulic fluid can lead to internal leakage, valve sticking, and premature wear of internal components.
7. Can the YOULI MB-4/1S be used in systems requiring power beyond capability?
Yes, the YOULI MB-4/1S can be configured for power beyond applications. The closed-center plug can double as a power beyond port, allowing for the connection of additional valves or hydraulic circuits in series. This feature enhances system scalability and allows for future expansion.
8. What are common issues that might require troubleshooting with this valve?
Common troubleshooting issues can include changes in system pressure or flow rate, internal leakage exceeding acceptable limits, or valve sticking. These problems can stem from contamination, component wear, or incorrect system setup. Regular maintenance and monitoring are key to prevention.
9. What is the primary market for the YOULI MB-4/1S hydraulic control valve?
This valve is primarily targeted towards special vehicles like truck-mounted cranes, wreckers, and scrubbing machines, as well as other industrial and mobile hydraulic applications. Its robust design and versatility make it suitable for demanding environments. It serves sectors requiring precise hydraulic actuation.
10. What is the significance of the "1S" designation in the YOULI MB-4/1S-3/18L/G4/M3 model name?
The "1S" in the model designation typically indicates specific configurations, such as an ON/OFF electro-hydraulic control kit with pilot and drain line, along with a backpressure valve. This denotes a particular electro-hydraulic control setup for the valve. It specifies a particular functional kit added to the base valve.
