Pilot-operated proportional relief valve
3 week ago
Product details
I. Product Overview
The QVHZO-AES is a direct-acting open-loop proportional relief valve that falls within the category of electro-hydraulic proportional control valves. It regulates system pressure by controlling the position of the valve spool through electrical signals, enabling continuous and proportional pressure control. This valve is characterized by its compact structure, rapid response speed, and high control accuracy, making it widely applicable in hydraulic systems that require precise pressure control.
II. Key Technical Parameters
1. Maximum Flow Rate: Typically reaches several tens of liters per minute (e.g., 45 L/min), with specific values varying by model, meeting the precise control needs of medium- to low-flow hydraulic systems.
2. Maximum Pressure: Capable of withstanding high-pressure operating conditions, generally up to 210 bar or higher, ensuring stable operation in demanding hydraulic environments.
3. Valve Type and Size: Conforms to ISO 4401 standards and is available in various port sizes (e.g., size 06), compatible with corresponding hydraulic piping systems.
4. Control Method: Direct-acting control with rapid response; features pressure compensation to automatically balance system pressure fluctuations and maintain constant flow, unaffected by load changes.
5. Position Detection: Equipped with an LVDT position sensor for real-time monitoring of the valve spool position, enabling closed-loop feedback control and significantly enhancing flow regulation accuracy.
6. Amplifier Type: Integrated digital amplifier (e.g., TEB basic type), supporting analog reference signal input and allowing flexible parameter setting and debugging via USB connection to software.
7. Signal Transmission: Stable analog signal transmission, compatible with conventional signal control requirements in industrial settings, eliminating the need for complex bus configurations for quick deployment.
III. Functional Advantages
1. High-Precision Regulation: The synergy between the LVDT position sensor and pressure compensation effectively counteracts flow disturbances caused by system pressure fluctuations and load variations, ensuring industry-leading flow regulation accuracy.
2. Convenient Debugging and Maintenance: Parameters can be set directly via USB connection to software without disassembling the valve body, reducing debugging complexity; the integrated amplifier is pre-adjusted at the factory, allowing interchangeability between valves and minimizing spare part replacement costs and downtime during equipment maintenance.
3. Stable and Reliable: Constructed with high-strength valve body materials and an optimized internal structure, it can withstand high-pressure impacts while exhibiting excellent resistance to vibration and oil contamination, adapting to complex working environments in industrial sites and extending equipment service life.
IV. Application Scenarios
The QVHZO-AES direct-acting open-loop proportional relief valve is suitable for various hydraulic systems requiring precise pressure control, with typical applications including:
1. Injection Molding Machinery: Controls the movement speed of hydraulic cylinders during the injection molding process to ensure the forming accuracy of plastic parts.
2. Metallurgical Equipment: Regulates the hydraulic actuator pressure in rolling mills and other equipment to ensure stable and synchronized operation during production.
3. Machine Tool Equipment: Used in the hydraulic feed systems of CNC machine tools to achieve precise control of tool feed speeds and enhance machining accuracy.
4. Other Industrial Sectors: Such as steel, chemical, power, and more, wherever precise pressure control is required in hydraulic systems.
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