air cylinder cotrol palm engraver

by richard westerfield
(hackensack new jersey)

dear sir

do you know of a way i can build a air cylinder cotrol plam engraver

if i sound like a nut case i am not

its air cylinder that drives a graver back and fouth with pressure seed control in the handle

as you push the the handle with your palm it go faster and faster when you let of the plam of your hand it goes slower and slower please help me if you can

thank you

Richard Westerfield

____________________
Bill says...

While I do not know of a valve that you can buy "off the shelf" to me, what you are describing, is a sort of "dancer valve" that reacts to increasing or decreasing pressure on the lever (or in your case the palm valve operator) to increase or decrease the flow of air to a single acting, spring return, air cylinder.

I welcome contributions here from companies that might manufacture these types of controls.

Cheers,

Bill

Comments for air cylinder cotrol palm engraver

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Oct 14, 2011
air cylinder controed palm engraver
by:

any one else want to add to this post
thank you
Richard Westerfield

Sep 16, 2011
danceing valve
by: richard westerfield

where can i find one of these and are they big ?
my be if i had a picture of one i would have a better idea of what i am geting myself in
thank you
Richard Westerfield

___________________

Richard, I don't know where you are in the world so I can't offer any specific info. Contact your local industrial suppliers of air cylinders and air valves. Any of them that have been in industry for a while will know of this type of circuit / valve.


Sep 07, 2011
"dancer valve"
by: Anonymous

whats a "dancer valve"
thank you
Richard Westerfield

__________________

One that responds to a changing input with a varying outflow. A basic one has air outflowing one port or another depending on the movement of the valve actuator. More complex ones can vary the outflow volume as well.

Think of a moving web, tracking back and forth on a roll. As the web moves off the roll towards one side it pushes on a lever that alters the angle of the roller slightly via an air actuator to move the web back onto the roll. As the web tracks to the other side of the roll, it releases the valve actuator, which alters the roller angle slightly the other way, to bring the web back. The web "dances" back and forth. Or, it could be used to increase or decrease tension on a web so that the web "stretch" stays within parameters.

B.


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what the diffrent between 4/2 and 5/2 valve in application..

by zaidi
(malaysia)

I want to buy .. a new valve for my project..and i just want to know ..the advantages between 4/2 and 5/2 valve.






Bill answers...

Hello Zaidi, and my thanks to you for visiting this website.

All other things being equal, having a 5 ported valve allows you to have two exhaust ports.

Having two exhaust ports sometimes increases the speed with with the air cylinder can be exhausted (though if speed is the issue using a quick-dump would be even more effective).

The main benefit is that, with a 5 ported valve, you can use an in-exhaust port flow control in each exhaust port to have different deceleration rates for the extend and the retract.

Here is more information for you on 5/2 air valves.

Cheers,

Bill

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can crusher valve.

by robert guyer
(phila. pa.)

150 psi, 6 gal Oil-Free Pancake Compressor
using this compressor. I would be using a pneumatic air cylinder no more then 2.5 bore with 6 inch minimum stroke.how do I select the proper manual hand valve to do the stroking and retraction of the air cylinder. thanks

_______________________
Bill says...

Robert, have a read of the pages about Air Valves and Air Cylinders on this site. That would be a good start.

You need to ask yourself how do you want the valve to work, and that will direct you to the correct type.

For example, a push button, a lever, a toggle switch, a rotating switch, how do you want to operate the valve.

Is the air cylinder single acting or double acting?

Do you want the cylinder to retract automatically when you let go of the valve operator, or do you want the cylinder to stay extended or retracted when you let go of the valve handle?

And so on....

Cheers,

Bill

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source of manually actuated 3 way valves (rated to 30 - 40 bar)

by POLAND_SPUD
(spudfiles)

Hi,
First of all, I have to say that I find your site extremely useful... I really appreciate all the work you had to put in it

I know that my quesiton is unusual and I am perfectly aware of all the dangers of going past recomended pressure ratings of various parts (though I found that are built robustly enough to be safely used past their pressure rating... for example the one in the link below)

I use DCV valves for spudding... here is a thread showing how I used a 3 way valve to build a fully semi-automatic pneumatic rifle (using a QEV valve as the main valve)->

My question is, 'where can I find valves rated to 30 - 40 bar?'.

I found that indirect acting spool valves handle high pressures pretty well but I want to know where I can find valves that are actually rated to be used at higher pressures?? preferably ones that are manually actuated via a lever or button?

thx for spending time to read my letter

_______________________
Bill says...

Thanks for the kind comment. They are few and far between.

Very interesting use of air valves, you have.

30-40 bar (450 to 600 PSI) really isn't that high a pressure, though you do not want to use a valve that is not rated for that pressure.

I simply used a search engine and typed in the string "high pressure valves" and found many sources.

Cheers,

Bill





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Another solenoid valve question.


This is the solenoid valve bolt I was talking about.






Bill comments...

Howdy again. Yes, this is indeed a manual over-ride for this solenoid valve.

It appears to be an air pilot operated valve. By that I mean that inside the solenoid housing is a small 3/2 NC air valve which, when the solenoid is energized, allows air from the supply to shift the main spool inside the body.

That's why the over-ride is where it is. On this valve, the over-ride simply opens an air path for the supply air (center port on the bottom of the valve shown) to diverted, through an internal path, and allows that diverted air to shift the spool, simulating the operation that occurs when the solenoid is energized.

Good to see that you've got an LED in the DIN connector for the solenoid. Having a light in the DIN connector answers very quickly the question... "is there power getting to my valve" and that helps diagnose an air circuit problem.

Cheers,

Bill

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