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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Sun, 12 Nov 2000 03:08:39 GMT
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Viewed:
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733 times
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In article <G3rK4E.87t@lugnet.com>, Neil Everett
<neil.everett@ntlworld.com> wrote:
> 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.
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.
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Message has 1 Reply:
 | | Re: Old pneumatic pistons
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| (...) I broke one direction valve while playing with the 8843 Fork Lift Truck. To further explain how the old-style pneumatics work: The handpump creates air preassure when pressed down and suction when pressed up. The spring on the pump is supposed (...) (24 years ago, 14-Nov-00, to lugnet.technic)
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Message is in Reply To:
| | Re: Old pneumatic pistons
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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 (...) (24 years ago, 9-Nov-00, to lugnet.technic)
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