In a CNC press brake, the ability to precisely control hydraulic pressure and flow during each stage of the bending process is essential. That control comes from the proportional valve—a servo-driven device that responds to digital signals from the CNC controller.
Unlike traditional on/off valves, proportional valves adjust output continuously based on real-time system feedback. This enables:
Smooth ram movement
Precise force application
Adaptive bending speed
🔧 How Proportional Valves Work
Proportional valves receive analog or PWM signals from the CNC controller, opening partially or fully depending on the desired pressure. In a Y1/Y2 electro-hydraulic system, each cylinder’s valve adjusts independently, responding to encoder feedback.
💡 Benefits in Press Brake Applications
Greater accuracy in tonnage application across the bend
Reduced oil heating, improving efficiency and lifespan
Better dynamic response, especially for complex multi-axis bending
Quieter operation compared to traditional hydraulic systems
In robotic lines or variable thickness material jobs, this precision is essential. Proportional valves allow the machine to “think” and adjust in milliseconds.
🏭 Brands and Quality
At Machnist, we use high-performance proportional valves from trusted manufacturers like Rexroth, Yuken, and Huade, ensuring tight tolerance performance in every press brake we build.
As a performance-driven Machnist manufacturer, we integrate proportional valves in our Max and Ultra series press brakes, especially where cycle time, energy savings, and automation matter most.
Looking to upgrade or retrofit? Our Machnist supplier team can help you select the right valve, calibrate your system, and maintain top bending precision over years of service.
