The duration of the rinsing operation via the rinsing valve depends on the type of
soiling and typically ranges between 10 and 60 seconds.
The durability of the components of the cleaning connection (sealing disc,
support sleeve, PTFE hose) is dependent on the style, pressure and temperature
of the required medium.
Durability of the cleaning connection
Medium
Max pressure
Temperature
[bar]
[psi]
[°C]
[°F]
Water
6
87
95
203
5% Nitric Acid
6
87
60
140
3% Sulfuric Acid
6
87
60
140
5% Nitric Acid
6
87
85
185
Steam
3
42
130
266
5.4
Resistance and permitted operating temperature of the sealing materials
The resistance and permitted operating temperature of the sealing materials
depend on the type and temperature of the medium conveyed. The exposure
time can adversely affect the service life of the seals. The sealing materials
comply with the regulations of FDA 21 CFR 177.2600 or FDA 21 CFR 177.1550.
The maximum operating temperature is defined by the sealing type and its
mechanical load.
Due to the versatile conditions of use (e.g. usage duration, switching frequency,
type and temperature of product and cleaning agents as well as usage
environment), GEA Tuchenhagen recommends that the user carries out
resistance tests.
Resistance:
•
+ = good resistance
•
o = reduced resistance
•
– = no resistance
Table of sealing resistance / permitted operating temperature
Medium
Maximum
operating
temperatures
Sealing material
EPDM
FKM
HNBR
Alkalis up to 3%
up to 80 °C (176°F) +
o
+
Alkalis up to 5%
up to 40 °C (104°F) +
o
o
Alkalis up to 5%
up to 80 °C (176°F) +
–
–
Alkalis more
than 5%
o
–
–
Technical data
Resistance and permitted operating temperature of the sealing materials
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Summary of Contents for VARIVENT D Series
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