Solenoid valves - Bürkert Fluid Control Systems

4. Materials for Bürkert solenoid valves
The materials for body, seals and actuator
are selected and intermatched to
produce optimum products in regards
to functional reliability/safety, fluid
compatibility, service life and economy.
Basically, the materials listed in the
table below, with the material properties
shown, are available. The available
materials can be taken from the relevant
data sheet for the solenoid valve.
Materials Code
General chemical resistance Permissible temperatures
Coil materials
Neutral media
constant
Neutral media
short-term
Aggressive media
constant
Epoxy resin EP Resistant to virtually all chemicals. -20 °C to
Not resistant to low-molecular organic +150 °C
acids in high concentration and highly
oxidizing substances.
Polyamide PA See Body materials (plastics)
Seal and diaphragm materials
Ethylene-propylene- EPDM (A) Good resistance to ozone and weathering, -30 °C to Dependent
rubber particularly suitable for aggressive +130 °C on the agchemicals.
Unfavorable for oils and
gressiveness
greases.
of the medium
and the
mechanical
load
Fluorinated rubber FPM (F) The chemical properties are the most -10 °C to -10 °C to
(FKM) favorable of all elastomers. +150 °C +200 °C
Nitrite rubber NBR (B) Good resistance to oil and petrol. -10 °C to -10 °C to
Unfavorable for oxidizing media. +90 °C +120 °C
Chloroprene rubber CR (N) The chemical properties are very similar -10 °C to -10 °C to
(neoprene) to those of PVC and lie between those of +100 °C +110 °C
NBR and EPDM.
Perfluorinat. rubber FFKM Similar to PTFE -10 °C to to
FFKM, FFKM (dependent on blend) +260 °C +320 °C
(FFKM only)
Chemraz +230 °C
Polytetrafluor- PTFE (E) See Body material (plastics)
ethylene
Steel 1.4112 -20 °C to -20 °C to
+450 °C +150 °C
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