Chief Delphi - Pistons only halfway up

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- - Pistons only halfway up (http://www.chiefdelphi.com/forums/showthread.php?t=90816)

Re: Pistons only halfway up

After reading though this I am a bit scared...
Our main forklift design has 2 double action valves rig into the input, air goes into one then in the input of the next one so we could can do mid-stork. Now there is no more air going into the cylinder then just using one value. Is this legal???

Re: Pistons only halfway up

I hate to be the bringer of bad news, but here goes...

Quote:

<R74> Each commanded motion of a pneumatic cylinder or rotary actuator must be accomplished via the flow of compressed air through only one approved pneumatic valve. Plumbing the outputs from multiple valves together into the same input on a pneumatic cylinder is prohibited.

No, your design is not legal, because per <R74>, "the motion of a pneumatic cylinder must be accomplished via the flow of compressed air through only one approved pneumatic valve". It is really hard to find this out this late in the build season, we are having to do a major design re-thinking and change.

Re: Pistons only halfway up

Sigh
Yes it is...............................the rule makes no sense unless FIRST was you not to be able to do midstroke....
okay so
is their ANY WAY to do a mid stroke with ONE value???