Lister said electrical and hydraulic options are the biggest competition to electro-pneumatic control. While there are some applications in which those technologies do fit better, there are a wide variety of others for which electro-pneumatic is the right solution.
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He said in the past, electrical control was typically better for providing the precision required of positioning applications. But with Proportion-Air’s two-loop QB2X pressure regulator, it is possible to get as good as, if not better, control over electrical.
With the QB2X, you can integrate a position sensor with an air cylinder and plug the sensor directly into the QB2X to allow for position control without having to utilize another PLC.
“Using the second loop technology, you can control speed, torque, or whatever you’d like,” said Lister. “If there's a sensor out there for it, we can hook it up to the QB2X.”
Hydraulic control is typically for those applications with high force requirements, typically in the tens of thousands of psi. However, Lister said Proportion-Air does have electro-pneumatic components, including the QBX pressure regulator, which are capable of achieving higher pressures. The company’s GX unit directly drives up to 1,000 psi.
For higher pressures, ratio regulators are available for the QBX which increase the amount of pressure that can be controlled. “We’ve controlled up to 7,500 psi,” he said. “We know from the process and part availabilities we can go up a little over 20,000 psi but no one has really had the application for that yet.”
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Applications with space or size constraints may also factor into the ability to use electro-pneumatic control. “If you don’t have compressed air or ways to fit hoses in, then you can use electrical for [applications] that need some precision,” said Lister. “Sometimes it is not worth putting a whole compressor in if there is just one little part that you need the precision on.”
READ MORE: Advanced Electropneumatic Positioning Achieves Dynamic Force Control
Applications Benefitting from Electro-Pneumatic Pressure Regulators
Determining the applications for which electro-pneumatic pressure regulators like Proportion-Air’s QBX are best suited is difficult because they control process variables. “That’s such a wide variety of things,” said Lister. “It’s like asking what’s the best benefit for a screw? It really depends on what you’re using it for; the benefits really vary wildly.”
He said the pressure regulators are commonly used in automation related applications, and have proved particularly beneficial for manufacturing semiconductors, medical devices, and automotive components.
One example he provided was controlling steam temperature for tire curing. Ensuring the correct temperature is reached and maintained throughout the curing process is critical to creating a safe and high-quality tire.
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