Electromechanical positioning has typically been the most common method of motion control in automation systems. But an alternative that&#;s gaining ground is electropneumatic positioning. Systems based on this technology rely on precision valves to control flow or pressure and, in turn, move an actuator to a required location. Here&#;s a closer look.
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In electromechanical systems, linear devices such as profiled rails, ball screws, and linear modules driven by electric motors lift, move, and place components. These systems can provide excellent positioning accuracy. Accurate positioning refers not only to an actuator&#;s endpoint accuracy, but also to the accuracy of its position at any selected point along a path of motion. In high-speed automation, precision motion sequences&#;not just in terms of positioning, but also in its timing&#;are crucial to manufacturing speed, throughput, and quality.
Electromechanical positioning can meet these requirements. However, electromechanical devices also have some inherent drawbacks that, over the long term, can increase manufacturing costs, cause production problems, and hurt overall productivity.http://www.machinedesign.com/motion-control/electropneumatic-valves-better-option-motion-control
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pneumatic vs electro-pneumatic valves
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For more information, please visit Electro Pneumatic Valve.
(Civil/Environmental)
(OP)
5 Jan 21 17:43Having a debate with colleagues whether there is a difference between these two types of pneumatic actuated valves. Can't find a clear definition which would explain the difference, but don't all pneumatic valves have electric solenoids (AC or DC) to control the air flow to the valves cylinder or diaphragm housing (or a positioner if its a modulating valve)? The solenoids require electricity to open or close, so does that not make the whole assembly electro-pneumatic valves (we just refer to them as pneumatic actuated valves or pneumatic valves)? Or is there such thing aa a fully pneumatic valve without requiring electricity of some form to control a solenoid or positioner?
Replies continue below
(Mechanical)
5 Jan 21 17:54Purely pneumatic CVs have pneumatic positioner (without electrical intervention). Electro-pneumatic valve will receive position signal from an electronic control system or positioner and final control element is pneumatic. It is similar to purely hydraulic vs electro-hydraulic control valves(as normally used for steam/gas turbines).
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(Marine/Ocean)
5 Jan 21 17:54There are valves that are operated entirely by air. They are typically called pilot operated valves.
(Mechanical)
12 Feb 21 07:06i feel definition of pneumatic or electro-pneumatic valves were some what old. As already few experts here expressed, pneumatic valve operates only by means of compressed air and the entire control is done by means of mechanical linkages. An electro-pneumatic valve involves solenoids, motors or any other electrically operated devices to operate the valve and control the valve. However, in present days one can not imagine a pure pneumatic valve to put in any kind of industry, be it cement, chemical, food, manufacturing or any other. Even a presence of solenoid valve in the valve assembly should be treated as electo-pneumatic or electro-hydraulic valve. With this definition, the valve hence forth attracts several other regulations and certifications in addition to mechanical safety. Hope this is helpful!
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