YOULI YL-PV4/9S Compact Hydraulic Proportional Valve

The YOULI YL-PV4/9S Compact Hydraulic Proportional Valve represents a significant advancement in precise fluid control for demanding industrial applications. This valve distinguishes itself through its high accuracy, rapid response times, and compact design, making it ideal for systems where space is at a premium and performance is critical. Key technical parameters include a maximum operating pressure of 350 bar, a flow rate range of 0-15 L/min (with specific models varying), and an electronic interface for seamless integration with modern control systems. The YL-PV4/9S ensures exceptional repeatability and minimal hysteresis, translating to superior process control and reduced energy consumption.

Product Specifications

| Parameter              | Specification                                       |

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

| Model                  | YL-PV4/9S                                           |

| Max. Operating Pressure | 350 bar (5075 psi)                                  |

| Flow Rate              | 0-15 L/min (typical, refer to specific sub-models) |

| Voltage Input          | 24 VDC (standard)                                   |

| Control Signal         | 0-10V or 4-20mA (configurable)                      |

| Operating Temperature  | -20°C to +70°C                                      |

| Sealing Material       | Viton or NBR (application dependent)                |

| Port Size              | See detailed datasheet for specific configurations    |

| Response Time          | < 20 ms (typical)                                   |

| Accuracy               | ±1% F.S. (typical)                                  |

Core Features & Market Positioning

The YOULI YL-PV4/9S excels in delivering high-performance proportional flow control within a remarkably small footprint. Its advanced solenoid design and internal spool configuration contribute to its excellent dynamic performance and responsiveness, setting it apart from larger, more complex valve systems. This compact proportionality offers significant advantages in machine design, allowing for greater integration density and reduced overall equipment size. The YL-PV4/9S is positioned as a premium solution for applications demanding precision, reliability, and efficiency where traditional valves might be over-engineered or physically prohibitive. Its robust construction and high-grade materials ensure longevity and consistent performance even in harsh industrial environments.

Key Application Scenarios

The versatility of the YOULI YL-PV4/9S makes it a prime candidate for a wide array of industrial automation and control systems. It is exceptionally well-suited for precision machine tool applications, where accurate control of cutting fluid flow or clamping pressure is paramount for part quality and tool life. In robotics and automation, the YL-PV4/9S enables sophisticated movements and force feedback through precise hydraulic actuation. It also finds critical use in material handling equipment, particularly in systems requiring delicate load positioning or variable speed control. Furthermore, its compact nature makes it ideal for mobile hydraulic applications and specialized test rigs where space and weight are significant considerations.

Practical System Integration Guidance

Integrating the YOULI YL-PV4/9S into an existing hydraulic system is streamlined due to its standardized interface options. The valve typically accepts a 0-10V or 4-20mA control signal, allowing for direct connection to most PLC (Programmable Logic Controller) outputs or dedicated motion controllers. Ensure the power supply is stable and meets the 24 VDC requirement, with adequate current capacity for peak solenoid energization. Proper hydraulic filtration (typically 10-micron absolute) is crucial to maintain the internal spool's integrity and ensure long-term reliability. When wiring, observe correct polarity for the electrical connections. For optimal performance, a proportional amplifier or a controller with built-in valve drivers is recommended to translate control signals into precise current for the solenoid. Always prime the system and bleed air thoroughly before initial operation to prevent erratic behavior.

Operation and Risk Mitigation

Operating the YOULI YL-PV4/9S requires adherence to specified pressure and flow limits to prevent component damage or system failure. Exceeding the 350 bar maximum operating pressure can lead to seal extrusion and valve body compromise. Conversely, operating below the minimum required pressure can result in sluggish response and poor control. The valve's internal components are sensitive to contamination, making regular system flushing and stringent fluid cleanliness paramount. Common troubleshooting involves checking the control signal for integrity and ensuring the proportional amplifier is correctly configured. If the valve exhibits erratic flow, inspect for air entrapment or particulate contamination within the spool and sealing surfaces. Faults are typically indicated by deviations in expected flow or pressure feedback, often requiring diagnostic checks of the control signal and electrical connections.

Scalability & Long-Term Value

The YOULI YL-PV4/9S offers considerable long-term value through its inherent compatibility with evolving industrial control architectures. Its digital-ready interface facilitates seamless integration into IIoT (Industrial Internet of Things) platforms and smart factory environments, enabling remote monitoring, diagnostics, and predictive maintenance. While the YL-PV4/9S itself is a highly integrated unit, scalability can be achieved by employing multiple YL-PV4/9S valves in parallel or series configurations to achieve higher flow rates or more complex multi-axis control. YOULI's commitment to manufacturing excellence ensures a consistent supply chain and readily available support, minimizing downtime and maximizing the operational lifespan of your hydraulic systems.

Frequently Asked Questions

1. What is the typical response time of the YOULI YL-PV4/9S?

The YOULI YL-PV4/9S generally exhibits a response time of less than 20 milliseconds. This rapid actuation is crucial for high-speed automation.

This speed allows for precise control in dynamic applications. It minimizes overshoot and oscillation in closed-loop systems.

Achieving this rapid response relies on the valve's efficient solenoid design and optimized spool dynamics. Proper system design enhances this inherent speed.

2. How does the YOULI YL-PV4/9S handle different fluid types?

The valve's sealing materials can be specified for compatibility with various hydraulic fluids. Common options include Viton and NBR.

Always consult the specific datasheet for fluid compatibility recommendations. Incorrect fluid selection can lead to seal degradation.

Using the correct fluid ensures optimal performance and extends the valve's operational life significantly. Maintain fluid cleanliness for all types.

3. Can the YOULI YL-PV4/9S be used in mobile hydraulic systems?

Yes, its compact size and robust design make it suitable for mobile applications. It conserves space and weight effectively.

Mobile applications often involve dynamic load changes, which the YL-PV4/9S can manage precisely. Ensure proper environmental sealing.

Electrical connections should be protected against moisture and vibration in mobile environments. Use appropriate connectors and cable glands.

4. What are the power requirements for the YOULI YL-PV4/9S?

The standard voltage input for the YL-PV4/9S is 24 VDC. Ensure a stable power supply with sufficient current.

Accurate voltage and current are vital for precise solenoid control and consistent valve performance. Fluctuations can impact accuracy.

Always use a power supply that can handle the peak current draw of the solenoid during energization. Overloading can damage the supply or valve.

5. What level of filtration is recommended for systems using the YL-PV4/9S?

A high level of fluid cleanliness is critical; typically, 10-micron absolute filtration is recommended. This protects the internal spool.

Contamination is a primary cause of premature wear and erratic operation in proportional valves. Maintain filtration integrity.

Regularly inspect and replace filter elements to ensure continued protection of the YOULI YL-PV4/9S and other hydraulic components.

6. How is the control signal interface configured on the YL-PV4/9S?

The valve typically supports 0-10V or 4-20mA analog input signals. This allows for flexible integration.

The specific configuration is often selectable or set during commissioning. Refer to the user manual for details.

Ensure the PLC or controller output matches the valve's input requirements for proper operation. Verify signal voltage/current.

7. What are the consequences of exceeding the maximum operating pressure?

Exceeding the 350 bar limit can cause seal failure, leakage, and potential damage to the valve body. This compromises system integrity.

The internal components are not designed for pressures beyond the specified maximum. Continued over-pressurization risks catastrophic failure.

Always operate within the defined pressure limits to ensure safety and longevity of the YOULI YL-PV4/9S and associated system parts.

8. Does the YOULI YL-PV4/9S offer position feedback?

While the YL-PV4/9S is a proportional control valve, integrated position feedback is typically not a standard feature. External sensors are often used.

Position feedback is usually managed by the higher-level control system (e.g., PLC) based on the command signal sent. The valve controls flow directly.

For closed-loop position control, an external feedback device and a suitable controller are necessary to achieve precise actuator positioning.

9. How does the compact design of the YL-PV4/9S benefit machine builders?

The compact footprint allows for smaller, more densely packed hydraulic manifolds and machine frames. This reduces overall machine size.

Reduced size can lead to lower material costs and more ergonomic machine designs. It also simplifies packaging for transport.

Enabling greater component density also opens possibilities for advanced functionality within constrained spaces on automated equipment.

10. What maintenance is typically required for the YOULI YL-PV4/9S?

The primary maintenance involves ensuring strict hydraulic fluid cleanliness and proper filtration. Regular filter changes are essential.

Periodic checks of electrical connections for security and integrity are also recommended. Inspect for any signs of external leakage.

While the valve is designed for long life, severe operating conditions may necessitate internal inspection or replacement over extended periods.