Proportional valves – precise control, flexible use

Proportional pressure control valves

These valves regulate the pressure in a system proportionally to an electrical control signal – usually 0–10 V or 4–20 mA. They maintain the desired output pressure even when the input pressure fluctuates or the load conditions change. Continuous comparison between the setpoint and actual values allows pressure control processes to be controlled very accurately.

Typical applications can be found in hydraulic systems, such as presses, test benches, or automotive engineering systems. In the process industry, where stable pressure is required over long periods of time, proportional pressure control valves also offer a clear advantage over purely mechanical or switching solutions.

Proportional flow control valves

When precise control of the flow rate is essential—whether for air, oil, or liquids—proportional flow control valves are the right choice. The valve opening is continuously adjusted depending on the control signal. This allows the volume flow to be precisely controlled, which is crucial in pneumatics, lubrication systems, or media dosing, for example.

They are used in production lines, cooling systems, or machines with variable output—anywhere where the flow must be flexibly and precisely adjusted to changing operating conditions.

Proportional directional control valves

These valves combine two functions: they control both the direction and the quantity of the medium. In hydraulic and pneumatic drives, they enable precise control of the direction and speed of movement – continuously and in both directions.

Proportional directional control valves are ideal for applications with complex motion sequences, such as in CNC machines, robotics systems, or automated handling systems. Their advantage: movements are smooth, precise, and jerk-free – even with load changes or different speed profiles.

Proportional solenoid valves

These valves use electromagnetic actuators to control the valve position proportionally to the control signal. Unlike conventional solenoid valves, which are either on or off, they offer fine-grained control of the valve opening. This makes them particularly fast to control and suitable for applications with short response times.

They are used, for example, in packaging machines, analytical and medical devices, and in food technology—anywhere where precision and dynamics are required and where hygienic or easy-to-clean designs are essential.

Proportional valves compared to solenoid valves and control valves

Unlike solenoid valves, which can only be switched on or off, proportional valves can be regulated continuously. They also have advantages over conventional control valves: they respond faster, require less space, and can be integrated more easily into modern control systems. This allows pressure and flow to be continuously and very precisely adjusted to changing conditions.