Datasheet

12
461
Subject to change
SI UNITS, SYMBOLS AND DIMENSIONING
Expressions and denitions
A short glossary of common terms
and denitions in pneumatics.
Cylinders
Double acting cylinder where the piston movement
in both directions occurs through the inuence of
pressurized medium.
Single acting cylinder where the piston movement in
one direction is done by the inuence of pressurized
medium and in the other direction by some other
force (spring).
Cylinder end cover the end caps that limit the piston
movement in the cylinder.
Piston rod the part that is rmly connected to the pis-
ton and passes through one end or both ends.
Extension when the piston rod moves out of the
cylinder.
Retraction when the piston rod moves into the
cylinder.
Extended when the piston rod is in its outer end
position.
Retracted when the piston rod is in its inner end
position.
Plus chamber the cylinder chamber, which when
pressurized generates extension.
Minus chamber the cylinder chamber, which when
pressurized generates retraction.
Valves
2/2 valve valve with an inlet and an outlet, can assume
two different positions.
3/2 valve valve with an inlet, an outlet and an exhaust,
can assume two different positions.
5/2 valve valve with one inlet, two outlets and two ex-
hausts, can assume two different positions.
5/3 valve valve with one inlet, two outlets and two ex-
hausts, can assume three different positions.
Normally closed valve (N.C.) If the valve is not ac-
tivated, the connection between inlet and outlet is
closed.
Normally closed valve (N.O.) If the valve is not ac-
tivated, the connection between inlet and outlet is
open.
Bistable valve Missing spring and remains in posi-
tion until it is activated. Has two stable positions and
“memory”.
Monostable valve Has a spring and returns to its
home position when it is not activated.
Directional control valve Valve that can control the
ow of alternate routes, or open and close the ow
path.
Flow control valve Valve that can regulate the ow
volume.
Pressure control valve Valve that can regulate the
pressure.
Direct operated The valve is direct activated by hand,
foot, or by mechanical means.
Pilot operated The valve is indirect activated by com-
pressed air through amplifying a manual, mechanical
or electrical signal to the valve stem or spool. A small
and easily adjustable valve controls the major valve.