Servo Valves for Large Plastic & Rubber Injection Molding Presses
Large plastic and rubber presses need hydraulic valves that can move high flows at high pressures while controlling clamp force, platen parallelism, and pressure profiles. Domin offers several models specifically for high-flow, high-force applications. They offer flow rates up to 153 gpm (580 lpm) with response time under 6.5 ms and bandwidth above 100 Hz (or <7 ms for flow rate up to 66 gpm (250 lpm) and a bandwidth above 140 Hz).
Control Challenges in Large Plastic & Rubber Molding Presses
In large molding presses that utilize plastic and rubber injection, hydraulic systems utilize higher flow rates at the same high pressure of smaller presses. Additionally, they still require the same precise control for functions such as clamp force, platen motion, and switchover. Traditional legacy valve designs fall short in these larger applications, as they can feature slow response rates, unstable control, and bulky housings. In turn, these limitations can create problems in production such as part variations and flash.
Domin Valves for Large Plastic & Rubber Molding Presses
For large molding presses with flow requirements up to 153 gpm (580 lpm), the Domin S Series provides comparable fast response times and frequency response, so that even large presses can get the quick, stable control that they require for tight dynamic control. For information about other large molding presses and how less dynamic applications can utilize more cost-effective options, read this article.
|
Hysteresis |
<0.2% |
<0.2% |
|
Leakage |
<0.8 gpm (<3 lpm) |
<0.4 gpm (<1.8 lpm) |
|
Mass |
8.8 lbs (4 kg) |
1.39 lbs (0.63 kg) |
|
Frequency Response |
> 120 Hz (-3 dB, up to ±25% FS) |
> 130 Hz (-3 dB, up to ±25% FS) |
|
Rated Flow |
13 to 66 gpm |
66 to 153 gpm |
|
Response Time |
<7 ms |
<10 ms |
|
Mounting Pattern |
NG10 |
NG16 |
For large plastic and rubber presses, these specs translate into better control of clamp force distribution, more reproducible pressure during cure, and a reduced risk of instability as the press works through long thermal cycles.
Our Recommended Valves – S12 Pro
The S12 Pro is our recommendation for large injection molding presses with high motion control needs. These fit interchangeably on NG16 configurations and are built on the proven S6 Pro (the most popular Domin valve) pilot stage. They are highly dynamic for valves of their size. The design prioritizes stability, durability, and consistency under heavy load, which is critical in presses where inconsistency can damage molds, compromise safety or affect end products. If you are working with small to medium sized rubber presses instead, find our recommendations here.