[admin]

ok, please check your email

[admin]

Forgot to add it’s http://www.WrekinPneumatics.co.uk

[admin]

Hi everyone,

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Hi sir, We are newly launched Systel Pneumatics online store . You can purchase your all pneumatic requirement with technical information through our systel store. Like Cylinders, Valves, Fittings , Tubes.. Plz Log on to http://www.systel.co.in.

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Hi, there are lot of things to consider when building a system. I would suggest you go through some online training sites to learn more before you begin.

[admin]

Can you give any more detail or description?, Can you give any more detail or description?

[admin]

Your problem is probably that your valve is internally piloted. Larger valves use air pressure to shift their spool from a smaller built-in direct solenoid valve. You need to contact the manufacturer or vendor to find out how to change your valve from an internally piloted valve to an externally piloted valve. I just recently went through this with Parker valves…their two position valve requires a minimum of 25 psi to shift the spool and their 3 position valved requires a minimum of 35 psi. This is necessary to overcome the seal friction of the o-rings on the spool.

[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.

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We have a complete range of items as per your requirement. Please register yourself at our Online Store at http://www.systel.co.in/sstore to browse through our Complete Product Range and Get a Instant Quote with Delivery Schedules. � Thank You and Wish You a Happy Shopping Experience at our Site

[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?

[Author]

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