SCPV Servo Proportional Valve is Here!

Hilin Technology, as a professional R&D and manufacturer of fluid solutions, is dedicated to providing precise and reliable fluid drive components for the medical, analytical, and environmental protection industries. To achieve accurate fluid control, we introduce the SCPV Series Servo-Controlled Proportional Valve—a permanent solution to the various challenges you may encounter when using proportional solenoid valves.

1.Requires a driver, inconvenient to use

To control the opening of a proportional solenoid valve via PWM voltage, an additional PWM driver is required alongside the valve.

2.Non-linear flow control

As proportional solenoid valves control the spool opening through electromagnetic force, achieving linear flow regulation is difficult. The flow curve is often second-order, meaning flow only increases monotonically with input voltage/current, but the rate of increase is non-linear. This affects the control accuracy of pneumatic systems, making closed-loop control necessary for precise flow regulation.

3.Hysteresis and backlash

Due to the nature of electromagnetic force, the spool displacement and flow path differ during voltage rise and fall. This results in inconsistencies between the ascending and descending flow curves. The difference between these two curves is known as hysteresis. The error between increasing and decreasing control signals in a system due to hysteresis is referred to as backlash—a challenging control issue.

4.Dead zone and micro-motion response

Near the zero point, small input currents or voltages fail to generate sufficient electromagnetic force to overcome mechanical resistance such as friction. As a result, the proportional solenoid valve does not respond within this small input range, known as the dead zone.

5.Lack of position monitoring

In systems without closed-loop monitoring, it is difficult to determine whether a proportional solenoid valve has executed a control signal accurately or reached the intended position.

6.Heating and temperature drift

After prolonged operation or significant changes in ambient temperature, the resistance characteristics of the solenoid coil change. This alters the electromagnetic force generated by the same control voltage, necessitating closed-loop control or temperature compensation.

The SCPV Servo Proportional Valve enables linear, hysteresis-free flow regulation based on control signals. It operates without heating, experiences no drift due to temperature changes, and responds to minute signals without a dead zone. All the challenges associated with proportional solenoid valves are no longer issues with the SCPV Servo Proportional Valve!

Compared to proportional solenoid valves, the SCPV Servo Proportional Valve offers significant advantages in the following aspects:

• No dead zone
• Minimal hysteresis
• No temperature drift
• High precision
• Low heat generation
• High linearity

7.Contact Us

Want to learn how the SCPV Servo Proportional Flow Control Valve solves all these challenges at once?
Click to contact the pre-sales engineers at Hilin Technology!
Website:www.mini-pump.com