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Pneumatics 39: Direct/Indirect Control | Heinz Peterschofsky (PEHE) | YouTubeToText
YouTube Transcript: Pneumatics 39: Direct/Indirect Control
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Video Transcript
hello and welcome to a new video about promatics
promatics
this time we're going to talk about you know
know
how we can control how we are using
control uh valves for our system
well i will again draw
a possible control yeah this time i'm
going to use
a single acting cylinder
just a spring the valve i need for a
single acting cylinder
right now here we would have
pressure intake so this is one this is
two this is three here we have an
exhaust here it's spring loaded
here's a button and if i press the button
the cylinder will go out okay pretty
straightforward approach okay this is
the most simple approach because
my input element because here is an
input button my input element
is already my control element and my
control element is switching the power to
to
to my cylinder yeah however this is not
used very often i show you now the
version or the
the variant how it is more common
again it's spring-loaded again we are
feeling it
and again here is the
pressure source and here we have three
one two three and now
i do not put the button here
and this i will use to switch
this valve so here is the connector one two
two
this is a parametrically controlled
valve yeah
and here we are also connected to the
pressure source one
so if we push here now one and two are connected
connected
this is operated this will push this and
we are going out
direct and indirect in german
control this is much simpler to say
this is more usual why because
usually here we want to have power
cylinder we want to have power because
this is our working element
so the cylinders are usually powerful
there's a reasonable size of cylinder
and so on
yeah so we need to switch a reasonable sized
sized
tube hose whatever is connected here
yeah to switch a reasonable sized
tube and need a reasonable sized valve a
reasonable sized valve
does have a operating forces and so on yeah
yeah
need more power yeah
so here this is not that easy this can
only be done
at rather small cylinders and rather
small forces then i can use
this variant yeah if this here is a big
bigger valve i can operate this bigger
buff with some small valve
yeah and this small valve is simply
helping me by switching the speaker off
i said yeah hey this we had already
pre-controlled rafael why don't we use
pre-controlled valve
yeah because sometimes or very often the
input elements
are not close to the working elements
they're somewhere yeah so there is quite
a distance in between
and i do not want i do not want to have
big cubes hoses yeah
air hoses very long because i need to
fill them i need to pressurize them i
need a lot of
air to feel bigger bigger
uh hoses i if i can operate this
with small tiny signal hoses where not
really much
areas it's just about pressure
information taking
yeah then i need less power
it's a big difference if i pressurize a
so also here this is an advantage so if
there is
if this is very close to the cylinder
this is no issue
yeah if this and the working element are
pretty far apart
then this is an issue then i keep this a
very tiny tiny line
and it's easy i do not waste
energy too much instead of
making this line long because then i
really have to pressurize
quite a big amount of volume simply
inside the tube
yeah non-direct approach
the price which is more than the
cylinder will pay itself
okay so direct indirect approach
indirect approach non-direct approach
preferable and used reasons i just told you
you
yeah now we know quite a lot of stuff here
here
we know quite a lot of valves now we know
know
uh you know we can throttle we can
switch we can operate and so on
so we're ready to solve some issues
this is what we're going to start the
next video next video
we will slowly
extend our knowledge about how we can
build up
we simply use the symbols and say okay
this and that we want to reach
and now how which valve we have to
connect how to each other
that this goal is reached some examples
then starting next video
for this time thank you very much for
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