Solenoid valves - Bürkert Fluid Control Systems

7.4.
Vacuum block for
tightness control of
serial parts
Field of application
Tightness control of packaged goods
in the production process. In this case,
tight packaging may not be damaged
or destroyed. Leaking packaging must
be detected within a short period so
that action can be taken to intervene
in the defective production process.
The system is primarily used in series
production or packaging.
Design
The test specimen is positioned in a
housing and the housing is sealed.
The following functions are then controlled
by the valve block. The air volume
is evacuated from the housing.
Helium is then admitted into the housing.
During a brief waiting period, helium
penetrates a leaking packaging.
This pressure drop in the housing is
measured. The helium is then evacuated
from the housing and the pressure
is equalized with the atmosphere. The
test specimen can be removed.
Characteristics
■ Body material: aluminum
■ Seal material: EPDM
■ Media: neutral gases
■ Media temperature:
-10 to +