Slowing a piston with full power

[Brian C]

One thing to remember about these flow control valves. They control the flow of air LEAVING the cylinder. They do not limit the flow of air entering the cylinder.

[dlavery]

Originally Posted by Brian C

One thing to remember about these flow control valves. They control the flow of air LEAVING the cylinder. They do not limit the flow of air entering the cylinder.

That is not automatically true. It all depends on how you use them, and how you place them in the pneumatic circuit.


-dave




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[Andrew Schuetze]

A quick study would seem to indicate that one would only need to constrict the flow of air entering the piston on the stroke one wants to limit the speed as the other side is open the atmosphere and just vents. However, taking this to an extreme limit though, if you completely or nearly completely close the needle valve on the vent side then is will limit the flow significantly and slow things down.

So here is my question, is it possible to use various settings on valves on both ends such that on the out stroke you have one speed and then on the in stroke a significantly different speed. a.ka. out - slow .... in - faster

Thanks,

APS

[TubaMorg]

Originally Posted by Andrew Schuetze

A quick study would seem to indicate that one would only need to constrict the flow of air entering the piston on the stroke one wants to limit the speed as the other side is open the atmosphere and just vents. However, taking this to an extreme limit though, if you completely or nearly completely close the needle valve on the vent side then is will limit the flow significantly and slow things down.

So here is my question, is it possible to use various settings on valves on both ends such that on the out stroke you have one speed and then on the in stroke a significantly different speed. a.ka. out - slow .... in - faster

Thanks,

APS

This would be possible, but you would need to mount the needle valves at the solenoid exhaust ports to be effective. If you mount the needle valves on the cylinders, air flow will be throttled in both directions which would prevent varying the speed per cylinder direction.

[Jeff K.]

Originally Posted by Andrew Schuetze

So here is my question, is it possible to use various settings on valves on both ends such that on the out stroke you have one speed and then on the in stroke a significantly different speed. a.ka. out - slow .... in - faster

We did this last year by putting one on each end of the piston, and adjusting each one accordingly. The best way to find out how it affects it is by adjusting one side a little, and then firing it back and forth and seeing how it reacts.
You can get them pretty different, just try and see what works best for your application.

You can have them on either the solenoid portion or the piston portion, won't really affect it that much since the air flow is mostly controlled by the small diameter of the adapters and plugs more than anything.