Servo Valves for Clamping Force Control

Q: How precise is the force and position regulation?

Domin valves feature onboard electronics to manage the spool’s position in closed-loop control. The PCB reads the spool feedback and adjusts the command in real time. Regulated flow and pressure ensures that the clamping cylinders move with minimal drift and lag.

Q: Why is clamping force important?

Clamping force is important, as it affects part quality. If the clamping force is too low, then the mold could open too soon during the injection process causing flash. If the clamping force is too high, then the equipment can suffer from stress and become damaged over time.

Q: Why are Domin servo valves good for clamping force?

Domin servo valves, such as the S6 Pro model, are exceptional for providing tight clamping force. Domin valves feature a fast step response with low hysteresis, enabling repeatable control of pressure, speed, and material flow of the clamp and injection unit.

Secure clamping control is critical in plastic injection molding, CNC machining and milling, stamping, and wood and timber processing, as components are subjected to high pressure and forces.

domin blue hydraulic servo valve S6 pro series

Why Clamping Force Matters

Adequate control of clamping force is important in injection molding, as it dictates part quality. For example, if the clamping force is too low, then the mold could open too soon causing flash and warping. Clamping force that is too high can result in added equipment stress over time. Domin servo valves provide incredibly tight closed-loop control of position, velocity, and force for stable workholding.

For clamping pressure control, servo valves regulate hydraulic pressure on the mold, ensuring that it is closed throughout the injection process, preventing problems like flash, warping, and distortion.

How the S6 Pro Controls Clamping Force in Injection Molding

For clamping control in injection molding applications, Domin’s S6 Pro servo valve is well suited due to its combination of low hysteresis and a fast step response. The S6 Pro offers the following characteristics that make it specifically suited for stable control. See the chart below.

Flow Rate	2.6 to 16.6 gpm (5 to 63 lpm)
Leakage at 100 bar	<0.3 gpm (<1.1 lpm)
Response Time at 100% Step Input	<3.5 ms
Frequency Response	>250 Hz
Hysteresis	<0.2%
Mass	1.36 lbs (0.62 kg)

Our Recommended Valves

The S6 Pro is an exceptional model for clamping force control. This model features low hysteresis for tight clamping control (as low as <0.2% hysteresis) with a fast response time of <3.5 ms to prevent system lag and for rapid response and adjustments to pressure fluctuations. The valve’s predictable linear control response makes it easy to tune.

FAQ for Clamping Force in Injection Molding

Domin valves feature onboard electronics to manage the spool’s position in closed-loop control. The PCB reads the spool feedback and adjusts the command in real time. Regulated flow and pressure ensures that the clamping cylinders move with minimal drift and lag. Learn how servo valves affect material flow and backpressure in injection molding.

Clamping force is important, as it affects part quality. If the clamping force is too low, then the mold could open too soon during the injection process causing flash. If the clamping force is too high, then the equipment can suffer from stress and become damaged over time. Learn more about clamping force for injection molding processes.

Domin servo valves, such as the S6 Pro model, are exceptional for providing tight clamping force. Domin valves feature a fast step response with low hysteresis, enabling repeatable control of pressure, speed, and material flow of the clamp and injection unit. Learn about how Domin servo valves affect injection speed and velocity control.

Schedule a demo with the S6 Pro in your press today.

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