Vacuum Glossary

A
The abrasion resistance refers to the resistance of suction cups.
In an absolute vacuum there is a pressure of 0 bar.
See ambient pressure
Air-saving function refers to the ejector's air-saving function during the handling procedure.
Ambient pressure refers to the hydrostatic pressure that exists at any given point.
B
Bernoulli's principle describes the drop in pressure of a fluid
C
The control pressure range is the range between the lowest and highest permissible control pressures.
The check valve is the valve that automatically monitors volume flow.
In a centralized vacuum system, the vacuum is generated with a central vacuum source for more than one suction cups.
The cycle time refers to the time taken for a repetitive process to complete one cycle.
D
In a decentralized vacuum system, a vacuum is generated directly at each individual vacuum suction cup.
E
The evacuation time refers to the time it takes to evacuate a certain volume to reach a required vacuum value.
F
The friction coefficient [μ] refers to the relationship between friction force and normal force (contact force between suction cup and workpiece).
Flow resistance refers to a reduced flow cross-section in a vacuum line.
H
Holding force refers to the force that can be exerted by a suction cup to grip a workpiece.
A high vacuum describes any vacuum in which there is an absolute pressure of 10-7 to 10-3 mbar.
Hysteresis refers to a pressure difference between two switching points, and thus defines the state of the output signal.
I
The inner volume indicates the volume of the body that has to be evacuated during a suction procedure.
The idle position of an NC valve refers to the position of the valve when it is not actuated, i.e. “closed” (normally closed).
The idle position of an NO valve refers to the position of the valve when it is not actuated, i.e. “open” (normally open).
See NC-/NO- valve
L
A low vacuum describes any vacuum in which there is an absolute pressure of 1 mbar up to atmospheric pressure (1,013 mbar).
Load case refers to the handling task, or the process of handling a workpiece.
Leakage refers to a leak within the vacuum system.
M
A medium vacuum describes any vacuum in which there is an absolute pressure between 0.001 mbar and 1 mbar.
N
Nominal flow refers to the maximum flow through a certain diameter (nominal diameter). The nominal flow is given in l/min or m³/h.
Normal force is the force component acting perpendicular to a surface. Every force acting on a surface can be divided into normal force and shear force (see “Shear force”).
NPN switching output refers to the configuration of a switching output.
O
The operating temperature is a temperature range.
Overpressure resistance refers to the maximum pressure that a body can resist.
P
PNP switching output refers to the configuration of a switching output.
R
The recovery time is the period in which the product is not being used.
Reference pressure is the pressure referred to by a sensor.
Relative pressure refers to the value of pressure in relation to the prevalent ambient pressure.
A reversing valve is a type of changeover valve used in a blower.
The minimum radius of curvature refers to the smallest radius that a suction cup can securely grip.
S
Standard pressure is the pressure in the atmosphere under standard conditions.
A standard liter is the measurement of a gas occupying a liter at 20 °C and 1,013 mbar (standard state).
Standard temperature is the temperature under standard conditions.
Shear force is the force acting tangentially to a surface.
The suction cup stroke refers to the stroke effect that is created by the suction cup.
See Holding force
See suction rate
Suction rate refers to the suction power of a vacuum generator.
The switching point refers to a point at which a switch changes the state of the output signal.
Shore hardness refers to the hardness of elastomers and plastics.
V
The ventilation time refers to the time it takes to dissipate vacuum in a system.
A vacuum is a pressure range lower than that of the ambient pressure.
Vakuum lifters relieve workers from the weight of a workpiece
The Venturi principle describes the correlation between dynamic and static air pressure when air flows through a tube.
Volume flow refers to the volume of a medium.
W
The workpiece temperature is the temperature of a processed workpiece.