<s>
A	O
pneumatic	O
control	O
valve	O
actuator	B-Algorithm
converts	O
energy	O
(	O
typically	O
in	O
the	O
form	O
of	O
compressed	O
air	O
)	O
into	O
mechanical	O
motion	O
.	O
</s>
<s>
The	O
motion	O
can	O
be	O
rotary	B-Algorithm
or	O
linear	B-Algorithm
,	O
depending	O
on	O
the	O
type	O
of	O
actuator	B-Algorithm
.	O
</s>
<s>
A	O
pneumatic	B-Algorithm
actuator	I-Algorithm
mainly	O
consists	O
of	O
a	O
piston	O
or	O
a	O
diaphragm	O
which	O
develops	O
the	O
motive	O
power	O
.	O
</s>
<s>
For	O
example	O
,	O
a	O
valve	O
could	O
be	O
controlling	O
the	O
pressure	O
in	O
a	O
vessel	O
that	O
has	O
a	O
constant	O
out-flow	O
,	O
and	O
a	O
varied	O
in-flow	O
(	O
varied	O
by	O
the	O
actuator	B-Algorithm
and	O
valve	O
)	O
.	O
</s>
<s>
Some	O
types	O
of	O
pneumatic	B-Algorithm
actuators	I-Algorithm
include	O
:	O
</s>
