Servo Valves for Composite Compression Molding

Q: When should I choose an S Series servo valve instead of a P Series proportional valve for compression molding?

Use a Domin S Series servo valve when your compression molding press needs high flow and ultra-precise control to maintain tight switchover timing and platen parallelism. P Series valves should be used when the control demands are a bit more forgiving and cost-effectiveness is a higher priority.

Q: What makes Domin servo valves and servo proportional valves well suited for compression molding?

Compression molding is a demanding application in both environment and control requirements. Domin servo valves are ultra-precise and robust, making them the perfect solution for composite compression molding. Specifically, Domin response rates as fast as <3ms and hysteresis as low as <0.2%.

Composite compression molding presses require precise motion control of the plates, clamp force, and switchover between filling and compression for quality assurance and time targets. Domin servo valves are designed to give these presses high-flow capability, fast dynamic response, and stable control for consistent parts.

Domin hydraulic servo valve and servo proportional valves group shot, S4 Pro, S6 Pro, S10 Pro, S12 Pro, P6 Pro, P10 Pro, P12 Pro

Control Challenges in Composite Compression Molding

Composite compression often combines high forces, fast cycles, and temperature sensitive materials. In these applications, the press must bring platens together evenly, maintain parallelism as the machine compresses, and manage switchover without over or under loading the part. Precise clamp force control is necessary in these applications for consistent end products. To learn more about the importance of clamp force in molding, read our article.

Control By System Demand: Our Recommended Valves

Not every compression molding press needs the same level of control. Domin’s S10 Pro and S12 Pro valves are recommended specifically for demanding applications. This can include high flow, high force compression, or applications that deal with high-value, thin, complex, or demanding composite materials. In these applications, switchover timing and platen parallelism are extremely tight.They are ideal for NG10 (CETOP 5) and NG16 (CETOP 7) systems respectively.

For presses with larger cycle times, less tight switchover windows, or broader parallelism tolerances, Domin’s P10 Pro and P12 Pro servo proportional valves provide control in applications that are a bit more forgiving. These are ideal for NG10 (CETOP 5) and NG16 (CETOP 7) systems respectively, due to their standard mounting patterns. For information about servo valves for large plastic or rubber molding instead of compression molding, read our article here.

	S10 Pro Valve	S12 Pro Valve	P10 Pro Valve	P12 Pro Valve
Hysteresis	<0.2%	<0.2%	<0.2%	<0.2%
Leakage	<0.8 gpm (<3 lpm)	<0.4 gpm (<1.8 lpm)	<0.4 gpm (<1 lpm)	<0.6 gpm (< 2.5 lpm)
Mass	8.8 lbs (4 kg)	1.39 lbs (0.63 kg)	8.8 lbs (4 kg)	15.4 lbs (<7 kg)
Frequency Response	> 120 Hz (-3 dB, up to ±25% FS)	> 130 Hz (-3 dB, up to ±25% FS)	> 65 Hz (-3 dB, up to ± 25% FS)	> 60 Hz (-3 dB, up to ± 25% FS)
Rated Flow	13 to 66 gpm (50 to 250 lpm)	66 to 153 gpm (250 to 580 lpm)	10.6 to 42 gpm (40 to 160 lpm)	42 to 153 gpm (160 to 580 lpm)
Response Time	<7 ms	<10 ms	<20 ms	<12 ms
Mounting Pattern	NG10	NG16	NG10	NG16

FAQ for Servo Valves in Composite Compression Molding

Use a Domin S Series servo valve when your compression molding press needs high flow and ultra-precise control to maintain tight switchover timing and platen parallelism. P Series valves should be used when the control demands are a bit more forgiving and cost-effectiveness is a higher priority.

Compression molding is a demanding application in both environment and control requirements. Domin servo valves are ultra-precise and robust, making them the perfect solution for composite compression molding. Specifically, Domin response rates as fast as <3ms and hysteresis as low as <0.2%.

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