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Materials

The respective application case is decisive for the type of valve used although the resistance of the materials to the operating medium also plays a significant role.

 

The selection of the material is primarily based on knowledge of the concentration, temperature and the level of pollution of the medium.

Other criteria are the operating pressure and the maximum volume because, similar to high temperatures, high pressures and flow velocities need to be taken into consideration when selecting the appropriate material.

 

All materials used in our valves, be it for the casing, seals or solenoids, are carefully selected according to the various application fields.

 

All information provided is non-binding and only for orientation purposes.

It cannot be used for the basis of guarantee claims.

 

 

Metallic materials for casings and inner parts

Material Material No. DIN Characteristics
Aluminium 3.2162.05 Al Si 8 Cu 3
Aluminium-die cast for casings up to PN16; for neutral media.
Stainless Steel 1.4571 X10 Cr Ni Mo Ti 18
Austenitic high-alloy steel for magnet stay tube and aggressive media.
Stainless Steel 1.4301 X 5 Cr Ni 18 9
High alloy austenitic stainless steel for internal valve parts and slightly aggressive media.
Stainless Steel 1.4104 X 12 Cr Mo S 17
Corrosion-resistant ferritic (magnetisable) stainless steel for e.g. magnet anchor and pole shoe, conditionally suitable for aggressive media.
Stainless Steel (cast material) 1.4581 G-X7 Cr Ni Mo Ti 18 10
Austenitic high-alloy steel for aggressive media.
Cast Iron 0.6025 GG - 25
Mainly for flange valve casings up to PN 16.
Limited temperature range. Suitable for neutral media.
Brass 2.0402 Cu Zn39 Pb3 F37
All-purpose. Not suitable for aggressive and ammoniac media.
Red Brass 2.1096 Cu Sn Zn Pb7
Applicable where brass is not suitable, e.g. for sea water, slight aggressive water or steam.
Spheroidal Cast Iron 0.7043 GGG - 40.3
Mainly used for flange valve casings up to PN25. Used where GG-25 is too brittle. Suitable for neutral media.
Cast Steel 1.0619 GS - C 25
Mainly used for flange valve casings up to PN40 and high temperature ranges. Suitable for neutral media.


Plastics for casing

Material Characteristics
PFA, Fluorine plastic
Resistant as PVDF, however, suitable for a higher temperature range from -20°C up to +150°C.
POM, Polyoxymethylen
Material with high hardness and less water absorption. Not for acids and bases and oxidants.
PP, Polypropylene
Resistant against watery solutions of acids, lyes and salts, depending on the concentration and temperature.
PVC, Polyvinyl Chloride
Resistant against most acids, lyes, saline solutions and organic solutions mixed with water. Not resistant against aromatic and chlorinated hydrocarbon.
PVDF,
Polyvinylidene Fluoride
Suitable for nearly all aggressive Media for a temperature range of -20°C up to +100°C.


Sealing Materials

Material Temperature Range °C Characteristics
EPDM-Ethylene-
Propylene-Rubber
-20 °C up to +130 °C
Resistant against lyes and acids, rubber of medium concentration, water, hot water and steam. Not resistant to oil and greases.
FKM-Fluorine Rubber -20 °C up to +180 °C
Elastomer with high temperature and resistance to atmospheric corrosion. Suitable for many acids, bases, fuels and oils (even synthetic). Inconstant to hot water and steam.
H-NBR -35 °C up to +150 °C
Elastomer with high ozone-, aging stability and resistance to atmospheric corrosion. Suitable for diluted acids, oils (animal and vegetable) and salt solutions.
NBR-Acrylonitrile-
Butadiene Rubber
-10 °C up to +80 °C
Elastic standard material for neutral medium like air and water. Highly resistant against mechanical loads.
PTFE-
Polytetrafluor-Ethylene
-180 °C up to +200 °C
A thermoplastic, no elastic material and therefore not suitable for the „classic“ diaphragms (separating foils are possible). Valve casings and inner valve parts are made from this material.
Peek -200 °C up to +300 °C
A thermoplastic, no elastic material and therefore not suitable for the „classic“ diaphragms (separating foils are possible). Suitable for extremely high temperatures and high pressures.
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