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Unread 15-10-2005, 18:25
gburlison gburlison is offline
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Re: Oscillating a pnuematics valve?

Quote:
Originally Posted by Andrew Blair
Darn, you're right. I didn't consider this. Perhaps if a flow control was used you could slow the air loss on the open side long enough to correct, then close it again. I'm considering an arm load where most of the time the load force is enough to allow control by opening only the lifting side for a moment. However, the arm itself wouldn't be heavy enough to lower the arm if it's not carrying something, so you would have to force it down using the other isde of the cylinder. Any ideas?
In the past we have created multi-position pneumatics by connecting a cylinder to a double solenoid valve and then plumbing the exhaust port of the valve to a single solenoid valve. The double solenoid valve is used to control the direction that you want the system to move and the single solenoid valve is then opened to allow movement, and closed to stop movement. It was totally manual and somewhat imprecise. With some feedback (switches or potentiometer) it should be better.
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