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Unread 28-03-2011, 21:19
cjwmam cjwmam is offline
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Re: Solution: Variable position of cylinder in compliance with <R74>

Originally Posted by cjwmam
If you use 5 port 4 way 3 position valve with presure center it will hold cylinder in any position and drain all air when you open your dump valve you may have to use regulator on non shaft side of cylinder to make up for area differance of shaft to avoid drift

If you use a valve in which the center position applies pressure to both ports, the cylinder rod will center itself. This may be desirable in certain cases, but it will not easily allow variable positioning.
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We have a 30" cylinder on the center lift of our robot we can stop & start any where we want going up or down works great with the above valve when you open drain valve air exits both sides cylnder