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Unread 23-03-2011, 18:11
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Re: Solution: Variable position of cylinder in compliance with <R74>

Quote:
Originally Posted by craigcd View Post
multiple purge valves (which are legal) sketch. You do not need check valves (which are illegal)
The fact remains that if you open up one of the valves (only one) ALL of the pressurized air must be released. Also, some other components, such as some flow control valves (which are legal), can act as check valves so the check valves in the schematic don't have to be actual check valves. If it was as simple as adding more plug valves, we would never have designed the other two, more complex, systems featured in this thread.
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