Subject:
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Re: Old pneumatic pistons
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 9 Nov 2000 15:26:19 GMT
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Viewed:
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513 times
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The old pneumatics worker slightly differently. Connections went like this:
Hand pump
connected to
direction valve
conn. to
switch valve
conn. to
cylinder
The direction valve split the pressure created during a compression stroke
from the suction (or negative pressure) on the up stroke of the hand pump.
The switch was then used to 'choose' between the 'pressure' pipe of the
'suction' pipe. Then a single output from the switch was connected to the
cylinder.
The disadvantage to this system is that the cylinder tended to be less
powerful when using 'suction' than wuth 'pressure'. Hence the new cylinder
use only pressure, directed to either end of the cylinder.
Hope this clears things up.
Neil
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Message has 1 Reply:
 | | Re: Old pneumatic pistons
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| (...) As a side note: that direction valve doesn't function very good if you fill up your *pneumatic* system with water (hydraulic)... case and point, mine's bust due to an ill-formed stroke of genius at age 10... C. (24 years ago, 12-Nov-00, to lugnet.technic)
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Message is in Reply To:
| | Old pneumatic pistons
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| Hi, can anybody comment on the old pneumatic pistons, those in e.g. 8851? They seem to have only one connector, so it seems that you can only push them out, not retract them like the new ones in e.g. 8462. Or is there some spring inside to contract (...) (24 years ago, 9-Nov-00, to lugnet.technic)
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