Key Differences Between Rexroth ED72 And ED73 Pressure Control Valves

Introduction

The Rexroth ED72 and ED73 valves are critical components in hydraulic systems, especially for pressure control in conjunction with Rexroth A10VO series pumps. While both valves are designed to protect and regulate pressure within the system, they offer distinct features and functionalities that cater to different hydraulic needs. In this article, we'll explore the key differences between the ED72 and ED73 valves to help you choose the right one for your specific application.

1. Pressure Control Function: ED72 vs ED73

ED72 Valve:

The Rexroth ED72 valve is primarily a pressure relief valve, designed to protect the system by releasing excess pressure once it exceeds a preset threshold. It ensures that critical hydraulic components such as pumps and actuators are protected from overpressure damage.

• Purpose: Protects the hydraulic system from overpressure.

• Control: Activates only when pressure exceeds the preset limit, providing basic protection.

ED73 Valve:

In contrast, the ED73 valve serves a dual purpose, offering both pressure relief and pressure reduction capabilities. This valve can not only relieve excess pressure but also reduce the system pressure to a desired level, making it ideal for applications requiring more precise control.

• Purpose: Provides both overpressure relief and pressure reduction.

• Control: Allows for fine control by adjusting the system pressure to a preset lower value.

2. Load Sensing Capabilities

ED72 Valve:

The ED72 valve lacks load-sensing functionality, meaning it does not adjust to variations in system load or pressure dynamically. It simply releases excess pressure when necessary.

• No Load Sensing: Static pressure relief without adjusting to load changes.

ED73 Valve:

On the other hand, the ED73 valve comes with load-sensing functionality, allowing it to adjust pressure and flow based on the system's load conditions. This dynamic feature helps optimize system performance, especially in applications where load conditions fluctuate.

• With Load Sensing: Adapts to load changes, optimizing pressure and flow in real time.

3. Application Versatility: ED72 vs ED73

ED72 Valve:

The ED72 valve is best suited for simpler hydraulic systems where the main concern is preventing overpressure. It works well in environments with stable load conditions and does not require advanced pressure control features.

• Best for Simpler Systems: Ideal for systems with stable pressure and load conditions.

ED73 Valve:

In contrast, the ED73 valve is designed for more complex hydraulic systems. It provides both pressure relief and reduction, along with load sensing, making it ideal for dynamic applications that demand precise pressure control.

• Best for Complex Systems: Perfect for systems that need load-sensitive pressure control and dynamic adjustments.

4. Pressure Control Range: ED72 vs ED73

ED72 Valve:

The ED72 valve is straightforward with its pressure relief function, offering adjustable settings to limit the maximum pressure within the system.

• Pressure Relief Only: Limits the system pressure to a predefined maximum value.

ED73 Valve:

The ED73 valve offers a more flexible solution with the ability to reduce pressure to a preset level in addition to relieving excess pressure, making it adaptable to more demanding applications.

• Pressure Relief + Reduction: Limits pressure to both a maximum value and a reduced level as needed.

Summary: Key Differences Between ED72 and ED73

Which Valve Should You Choose?

• Choose the ED72 Valve if your hydraulic system requires basic pressure relief without dynamic adjustments. It’s the perfect fit for stable systems where overpressure protection is the primary concern.

• Choose the ED73 Valve if your system demands precise control, especially where pressure needs to be reduced to specific levels, and load conditions vary. The ED73 valve is ideal for more complex systems where dynamic adjustments are necessary for optimal performance.

Conclusion

In conclusion, the Rexroth ED72 valve is an excellent choice for simpler hydraulic systems that require basic pressure relief to prevent overpressure. In contrast, the Rexroth ED73 valve provides advanced capabilities, combining both pressure relief and reduction with load-sensing functionality, making it suitable for more dynamic, high-performance applications. Understanding these key differences will enable you to select the right valve for your hydraulic system, ensuring both efficiency and safety.