[admin]

You could also use a direct-acting valve, but it requires more voltage to shift. I agree with the 1st reply 100% though.

[admin]

Herion was purchased by Norgren try checking directly with Norgen or a Norgren distributor.

[admin]

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[admin]

There are a couple ways of handling this. 1-Air fuse, this will cut off the supply in case of a rapid failure. 2-Pressure swtch to operate 2/2 nc valve held open

[admin]

Thanks Barry, it took me a while to come back to this project but thats very helpful!

[admin]

If your calculations are correct you may have a problem with the actuator leaking. The air may be bypassing the piston seals which will reduce the thrust. Is there any excessive air exhausting through the exhaust ports of the valve?

[admin]

The force of 4524 Newtons doesn’t leave much room for friction losses. Unless it is a ‘frictionless’ cylinder, I always allow 11-20% loss due to internal seal friction. Did this force come from the manufacturer or from a generic piston size/pressure table? If you dig a little you can probably get a % loss number from the manufacturer’s catalog. Is there any potential side loading during the pressing action? This could be causing additional side load adding to friction. Are there external guides (bearings/sleeves/shafts) contributing to friction? How straight is the pin when it starts-is it possible to start ‘crooked’? Is the rod area on the pressure side subtracting from the force? If none of the above than I’d look further at the pressure generated at worst case press and the friction factor between dry steel and aluminum-I assume that is where you started.

[admin]

Was it working before then started acting this way?

[admin]

It sounds like another signal is being sent to the control valve. Is the control valve solenoid operated or air pilot?

[admin]

There are a few ways of doing this, but easiest would be either a brake on the cylinder or if the accuracy and weight are low a simple 3 positiion valve may work fine. How accurate does in need to be, and what is the load?

[admin]

Accuracy isn’t that important, give or take 5mm. Load will start at 300g and increase with 300g everytime till 3kg, because 1 product weights 300g and needs to be 10 of them.

[admin]

On the subject of the 3 position valve, will it be able to lower it 10 times?

[admin]

It can move as many times as necessary. How do you plan on stopping the cylinder in the correct position? The most positive way would be to have sensors or switches that would send a signal to a PLC to control the 3 position valve.

[admin]

I was thinking about putting a timer in to send a signal every second or the time it needs to move down. I thought about putting sensors but then its gonna be 10 of them and then its starting to get to expensive.

[admin]

That could work but you may need 2 timers one for up and one for down. If you have the 3 position valve you can add a timer that is integrated into the connector. Try http://www.canfieldconnector.com/products/timers-proportional-and-electronic-circuits.htm .

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