View Tameson’s selection of proportional solenoid valves and controllers. A proportional solenoid valve allows you to control the flow precisely with a very fast response between 0-100% open, rather than just completely open or closed. Although they can be controlled with a simple variable DC signal, it is strongly recommended to use pulse-width modulation (PWM) which limits hysteresis and improves sensitivity. Dedicated PWM controllers for proportional solenoid valves have additional functionalities to improve performance, such as the Bürkert 8605 or 8611. Furthermore, the Bürkert 8605 uses an open loop system and takes an input signal to adjust the valve’s opening to ensure the correct flow parameters (pressure, flow rate, fluid level, temperature, etc.) during operation. Additionally, some controllers can control standard normally open/closed process control valves, sensors, and a wide array of other electrical devices used for fluid control applications. If you need assistance in selecting a valve or controller, please read our article about proportional control valves or contact us.