YOULI YL-PV4/7S Hydraulic Proportional Valve

The YOULI YL-PV4/7S Hydraulic Proportional Valve stands as a sophisticated solution for precise fluid control in demanding industrial applications. This valve offers exceptional accuracy and responsiveness, ensuring optimal performance and efficiency in hydraulic systems. Key advantages include its superior flow control capabilities, robust construction for longevity, and advanced electronic interface for seamless integration. Technical specifications highlight its reliable operation, with a nominal flow rate of 4 L/min and a maximum operating pressure of 70 bar, making it suitable for a wide range of medium-duty hydraulic tasks.

Product Specifications

| Parameter            | Specification                                      |

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

| Model                | YOULI YL-PV4/7S                                    |

| Nominal Flow Rate    | 4 L/min                                            |

| Maximum Pressure     | 70 bar (1015 psi)                                  |

| Voltage              | 24 VDC                                             |

| Control Signal       | Proportional current                               |

| Port Size            | Standard manifold mounting                         |

| Response Time        | < 10 ms                                            |

| Operating Temperature | -20°C to +80°C                                     |

| Sealing Material     | Viton (standard)                                   |

Core Features & Market Positioning

The YOULI YL-PV4/7S distinguishes itself through its high-performance electro-hydraulic control technology. Its proportional current input allows for infinitely variable adjustment of flow, enabling precise control over actuator speed and position. This level of precision is critical in applications where deviations can lead to product defects or operational inefficiencies. Compared to traditional on/off or servo valves, the YL-PV4/7S offers a compelling balance of performance, cost-effectiveness, and ease of integration, positioning it as a preferred choice for manufacturers seeking reliable and accurate hydraulic proportional control without the complexity or expense of higher-tier solutions. Its robust design ensures reliable operation in harsh industrial environments, contributing to reduced downtime and maintenance costs.

Key Application Scenarios

This proportional valve is ideally suited for a diverse array of industrial automation and control systems. Its precise flow regulation makes it invaluable in injection molding machines for controlling clamp and injection speeds, ensuring consistent product quality. In machine tools, the YL-PV4/7S enables delicate control of cutting speeds and feed rates, enhancing precision and surface finish. It also finds significant application in material handling equipment, such as robotic arms and automated guided vehicles (AGVs), where smooth and controlled movements are paramount for efficiency and safety. Furthermore, its suitability for precise pressure and flow adjustments makes it a strong candidate for testing and measurement rigs across various manufacturing sectors.

Practical System Integration Guidance

Integrating the YOULI YL-PV4/7S into existing hydraulic systems is streamlined due to its standard manifold mounting pattern and common voltage requirements. The valve operates using a proportional current signal, typically between 0-1000 mA, which requires a compatible proportional amplifier or a PLC with analog output capabilities. For optimal performance, a clean hydraulic fluid supply is essential, adhering to ISO 4406 cleanliness standards of 18/16/13 or better. Electrical connections should be made using a suitable multi-pin connector, ensuring proper grounding and polarity. Careful consideration of system back pressure and potential for cavitation is advised during the design phase to maintain the valve's longevity and performance accuracy.

Operation and Risk Mitigation

Proper operation of the YOULI YL-PV4/7S hydraulic proportional valve hinges on adherence to specified operating parameters, particularly pressure and flow limits. Exceeding the 70 bar maximum operating pressure can lead to component damage and system failure. Contaminated hydraulic fluid is a primary cause of premature wear and operational issues, necessitating regular fluid filtration and analysis. Faulty electrical signals or incorrect wiring can result in erratic valve behavior or complete failure. In the event of malfunction, a common troubleshooting step involves verifying the input control signal and checking for electrical continuity. While specific fault codes are not typically generated by the valve itself, system diagnostic tools connected to the proportional amplifier can help identify signal-related issues.

Scalability & Long-Term Value

The YOULI YL-PV4/7S offers excellent long-term value through its compatibility with a broad range of hydraulic power units and control systems. Its standard interface ensures that it can be readily incorporated into existing automation frameworks or future upgrades. While the YL-PV4/7S is designed for specific flow and pressure ranges, its technology principles align with more advanced electro-hydraulic controls, providing a foundation for understanding and transitioning to higher-performance systems if future application needs evolve. The robust construction and inherent reliability minimize the need for frequent replacements, contributing to a lower total cost of ownership over the system's lifecycle.

FAQs

What is the primary function of the YOULI YL-PV4/7S?

The YOULI YL-PV4/7S is a hydraulic proportional valve designed for precise control over fluid flow.

It allows for infinitely variable adjustment of flow rates based on an electrical control signal. This precision is crucial for applications requiring accurate speed or position control of hydraulic actuators.

Its core function is to enable fine-tuned hydraulic system performance, optimizing efficiency and product quality in various industrial settings.

What are the key technical specifications of the YL-PV4/7S valve?

This valve operates with a nominal flow rate of 4 liters per minute.

It is rated for a maximum operating pressure of 70 bar (approximately 1015 psi) and typically runs on a 24 VDC power supply.

Other important specifications include a fast response time of under 10 milliseconds and compatibility with standard manifold mounting.

In which industries is the YOULI YL-PV4/7S commonly used?

The YL-PV4/7S is widely applied in sectors like plastics manufacturing, particularly in injection molding machines.

It is also utilized in machine tool automation for precise control of movements and in material handling systems such as robotics.

Its ability to provide accurate flow control makes it suitable for testing equipment and other specialized industrial machinery.

How is the YL-PV4/7S valve controlled?

Control is achieved through a proportional current signal, typically ranging from 0 to 1000 mA.

This signal is usually supplied by a dedicated proportional amplifier or a PLC with appropriate analog output modules.

The input signal directly dictates the valve's spool position, thereby regulating the hydraulic fluid flow rate.

What are the advantages of using a proportional valve like the YL-PV4/7S?

Proportional valves offer highly precise and smooth control over actuator speed and position.

They enable infinitely variable adjustments, leading to improved process efficiency and repeatability in manufacturing.

Compared to on/off valves, they reduce shock and vibration, extending system component life.

What is the maximum flow rate and pressure rating for the YL-PV4/7S?

The valve has a nominal flow rate capacity of 4 liters per minute.

Its maximum permissible operating pressure is 70 bar, which is equivalent to 1015 pounds per square inch.

Operating within these limits ensures optimal performance and prevents damage to the valve and the hydraulic system.

What type of electrical signal does the YL-PV4/7S require for operation?

The valve requires a proportional current signal to operate.

Commonly, this signal ranges from 0 mA to 1000 mA, with the specific current value determining the valve's flow output.

A stable and accurate current source, such as a proportional amplifier, is necessary for precise control.

Can the YL-PV4/7S be integrated with standard PLC systems?

Yes, it can be integrated with PLC systems that are equipped with analog output modules.

These modules generate the necessary proportional current signal to command the valve's operation.

Proper configuration of the PLC's output settings is essential for achieving the desired control accuracy.

What maintenance considerations are important for the YL-PV4/7S?

Maintaining clean hydraulic fluid is paramount to prevent wear on internal components.

Regularly inspect electrical connections for corrosion or damage to ensure reliable signal transmission.

Adhere strictly to the specified pressure and flow limits to avoid overstressing the valve.

How does the YL-PV4/7S compare to traditional hydraulic valves?

Unlike simple on/off valves, the YL-PV4/7S provides graduated flow control.

It offers more precise positioning and speed regulation than manually or solenoid-operated directional valves.

Its proportional control capabilities allow for more sophisticated automation compared to basic hydraulic valves.