YOULI MB-4/6S Hydraulic Control Valve

The YOULI MB-4/6S Hydraulic Control Valve is a high-performance, compact, and efficient directional control valve designed for demanding mobile and industrial hydraulic applications. Its robust construction, precision-engineered spool, and versatile actuation options make it a superior choice for precise fluid power management. With a nominal flow rate of up to 60 L/min and a maximum operating pressure of 315 bar (4600 psi), the MB-4/6S offers exceptional control and durability. Key advantages include low pressure drop, ensuring optimal energy efficiency, and a long service life due to its hardened high-accuracy spool. The valve also provides flexibility through various port and circuit valve options, as well as multiple actuation methods such as manual, pneumatic, hydraulic, and electro-hydraulic control.

Product Specifications

| Feature             | Specification                                      |

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

| Model               | YOULI MB-4/6S                                      |

| Type                | Monoblock Directional Control Valve                |

| Nominal Flow Rate   | 60 L/min (16 US gpm)                      |

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

| Back Pressure (Max) | 25 bar (360 psi)                  |

| Fluid Temperature   | -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 | -40°C to 60°C                            |

| Mounting            | Sub-plate mounting                       |

| Spool Options       | Various options available                |

| Actuation Methods   | Manual, Pneumatic, Hydraulic, Electro-hydraulic |

| Circuit Type        | Parallel or tandem circuit       |

| Load Check Valve    | Independent load check valve in each section |

Core Features & Market Positioning

The YOULI MB-4/6S distinguishes itself in the competitive hydraulic control valve market through its emphasis on precision, reliability, and operational flexibility. Its monoblock design contributes to a compact and lightweight structure, facilitating easier integration into various hydraulic systems without compromising performance. The valve's inherent leak-proof characteristic, combined with a low pressure drop, directly translates to higher system efficiency and reduced energy consumption – critical factors for modern industrial and mobile equipment. YOULI's reputation, built over decades of specialized manufacturing, positions the MB-4/6S as a dependable component for applications demanding consistent performance and longevity. The availability of numerous spool options and actuation methods allows for extensive customization, enabling users to tailor the valve precisely to their unique operational requirements, further solidifying its market appeal.

Key Application Scenarios

The versatility of the YOULI MB-4/6S hydraulic control valve makes it ideally suited for a wide array of applications across different sectors. In the mobile hydraulics domain, it is frequently employed in specialized vehicles such as truck-mounted cranes, wreckers, and various construction equipment where precise control of lifting, steering, and auxiliary functions is paramount. Its robust design also lends itself to industrial automation, powering hydraulic presses, material handling systems, and machine tools that require reliable and responsive directional control. Furthermore, the MB-4/6S finds application in agricultural machinery for implement control, forestry equipment for boom and grapple actuation, and waste management vehicles for operational functions. The ability to configure the valve for different circuit types and actuation methods ensures its suitability for both simple and complex hydraulic circuits.

Practical System Integration Guidance

Integrating the YOULI MB-4/6S hydraulic control valve into existing or new systems is streamlined by its sub-plate mounting design, which simplifies installation and maintenance procedures. The valve’s standardized porting facilitates direct connection to hydraulic lines, reducing the need for complex adapters. When selecting actuation methods, users should consider the operational environment and control requirements; manual actuation is suitable for direct operator control, while electro-hydraulic options are ideal for automated systems requiring remote or precise electronic command. For electro-hydraulic configurations, proper wiring of the solenoid coils to the control unit is crucial, typically involving connections to 12VDC or 24VDC power sources, depending on the specific solenoid kit chosen. Careful attention to fluid compatibility and cleanliness is essential during installation to prevent contamination, which can lead to premature wear or malfunction of the high-accuracy spool.

Operation and Risk Mitigation

Proper operation of the YOULI MB-4/6S hydraulic control valve is key to maximizing its lifespan and ensuring system safety. Users should adhere to the specified operating pressure and fluid temperature ranges to prevent component damage or performance degradation. Over-pressurization beyond the 315 bar (4600 psi) limit can lead to seal failure or structural compromise. Maintaining fluid cleanliness is paramount; the valve's internal components, particularly the spool, are sensitive to particulate contamination, which can cause erratic operation or complete valve failure. In case of unusual noise, sluggish operation, or complete loss of function, a systematic troubleshooting approach is recommended. Common issues may include external leakage due to worn seals, internal leakage caused by spool wear or contamination, or actuation problems if the chosen control method (e.g., solenoid) is malfunctioning. For electro-hydraulic variants, checking solenoid coil resistance and continuity can help diagnose electrical issues. Always ensure the system is de-pressurized before attempting any maintenance or troubleshooting procedures.

Scalability & Long-Term Value

The design of the YOULI MB-4/6S hydraulic control valve offers significant long-term value and potential for system scalability. Its modular construction allows for the addition of workgroup sections (spools) up to a certain limit, enabling system expansion to accommodate evolving operational demands without requiring a complete valve replacement. Furthermore, the availability of "Power Beyond" ports on some configurations provides a pathway for incorporating additional valves in series, expanding system functionality and complexity. While direct integration with IIoT platforms may require complementary control interfaces or sensors, the valve's precise and repeatable operation makes it an excellent foundation for hydraulic systems being modernized for digital monitoring and control. Compatibility with standard SAE or BSPP port sizes ensures ease of integration with a wide range of hydraulic components and plumbing.

Frequently Asked Questions (FAQs)

What is the maximum flow rate for the YOULI MB-4/6S Hydraulic Control Valve?

The nominal flow rate for the YOULI MB-4/6S is rated at 60 liters per minute (16 US gallons per minute). This capacity ensures efficient fluid delivery for a wide range of mobile and industrial applications.

Can the YOULI MB-4/6S valve be used in high-pressure systems?

Yes, the MB-4/6S is designed for high-pressure operation, with a maximum operating pressure of 315 bar (4600 psi). It is suitable for demanding applications requiring robust hydraulic control.

What are the available actuation methods for the YOULI MB-4/6S?

This valve supports multiple actuation methods, including manual, pneumatic, hydraulic, and electro-hydraulic controls, offering flexibility for diverse system designs and operational needs.

Does the YOULI MB-4/6S have internal load holding capabilities?

The valve features an independent load check valve in each section, providing essential load-holding capabilities to prevent actuator drift. Optional port reliefs further enhance safety.

What is the recommended fluid type and temperature range for the MB-4/6S?

It is designed for use with mineral oils, with operating temperature ranges of -20°C to 80°C for NBR seals and -20°C to 100°C for FPM (Viton) seals. Maintaining proper viscosity is also critical.

How does the MB-4/6S handle different hydraulic circuits?

The valve is compatible with parallel, tandem, and series circuit configurations, allowing for versatile integration into various hydraulic system architectures.

Can the number of spools be expanded on a YOULI MB-4/6S valve?

Yes, the monoblock design allows for the addition of workgroup sections (spools) to meet specific application requirements, enhancing system scalability.

What is the typical response time for an electro-hydraulic actuation on the MB-4/6S?

Response times depend on the specific solenoid and control system. However, the precision spool design generally ensures responsive actuation for automated functions.

Are there specific installation considerations for the MB-4/6S?

Yes, sub-plate mounting is recommended for ease of installation and maintenance. Ensuring fluid cleanliness and proper line connections is critical for optimal performance.

What is the typical lifespan or expected durability of the YOULI MB-4/6S?

YOULI designs its valves for long service life, benefiting from hardened spools and robust construction. Proper maintenance and adherence to operating parameters maximize longevity.