Short definition
Proportional technology enables continuous, precise control of flow, pressure or position using electrically controllable valves and actuators. In contrast to binary switching valves, proportional valves allow continuous control variable changes proportional to the electrical input signal. They use electromagnetic or piezoelectric actuators with a closed loop. Control loop. In membrane filtration systems, proportional technology enables precise dosing, dynamic pressure control and optimized process control with minimal pressure surges and vibrations.
Functional principle
Proportional valves convert an analog electrical signal (0-10V, 4-20mA) into a proportional mechanical control variable. A proportional solenoid positions the valve spool continuously, with an integrated position sensor reporting back the position. The built-in electronics regulate the position in the closed position. Control loop with high dynamics and repeat accuracy. Hydraulic proportional valves precisely control flows of up to several hundred liters per minute. Pneumatic proportional valves control pressure or flow in compressed air circuits. Modern systems with fieldbus connection enable digital parameterization and diagnostic functions.
Areas of application
Proportional technology is essential for demanding membrane filtration processes with dynamic requirements. It enables gentle pressure ramps during start-up to protect the membranes, precise chemical dosing during CIP cleaning and adaptive crossflow control to minimize fouling. The continuous adjustability reduces mechanical loads and significantly increases process stability.
Typical areas of application:
- Proportional pressure control with transmembrane pressure control
- Precision dosing of chemicals and additives
- Smooth flow control with frequency inverter alternative
- Dynamic backwash pressure control
- Positioning gate valves in large pipelines
Summary
Proportional technology increases process quality through precise, dynamic control and protects system components through gentle changes in control variables. It reduces energy consumption through demand-based control and minimizes product losses. For plant manufacturers, it means greater process stability, longer diaphragm service life and optimum integration into modern automation architectures with extended diagnostic options.
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