Due to the various operating conditions (e.g. duration of operation, switching
frequency, type and temperature of product and cleaning agents as well as
operating environment), GEA Tuchenhagen recommends the performing of
resistance tests by the user.
Resistance:
•
+ = good resistance
•
o = reduced resistance
•
- = no resistance
Table sealing resistance / permitted operating temperature
Medium
Maximum operating
temperatures
Sealing materials
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
–
–
Inorganic acids up to 3%
up to 80 °C (176°F)
+
+
+
Inorganic acids up to 5%
up to 80 °C (176°F)
o
+
o
Inorganic acids up to 5%
up to 100 °C (212°F)
–
+
–
Water
up to 100 °C (176°F)
+
+
+
Steam
up to 135 °C (275°F)
+
o
o
Steam, approx. 30 min
up to 150 °C (302°F)
+
o
–
Fuels/hydrocarbons
–
+
+
Product with a fat content of max. 35%
+
+
+
Product with a fat content of more than 35%
–
+
+
Oils
–
+
+
Table sealing material - temperature resistance
Sealing materials
General temperature resistance*
EPDM
-40...+135 °C
(-40...275 °F)
FKM
-10...+200 °C
(+14...+392 °F)
HNBR
-25...+140 °C
(-13...+284 °F)
* The general resistance of the material does not correspond to the maximum operating temperature.
5.4
Pipe ends - General table of measurements
Hint!
Not every valve is available in every size. Particulars of available sizes
of valves see Chapter 5, Page 27.
Technical data
Pipe ends - General table of measurements
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