Industry Diaphragm Valves - GEMU - #19

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19 Areas of use for valve body materials and diaphragms Industrial valves I Areas of use for valve body materials and diaphragms Valve body material Areas of use Temperature range* Cast iron General industrial applications, water, alkaline inert media, gas and oil limited by diaphragm material Cast iron with Halar lining (ECTFE) Very suitable for strong mineral acids, oxidative acids and alkalis. Should not be used for particulate and abrasive media. 14° to 248°F -10° to 120°C Cast iron with CSM lining (chlorosulphone-polyethylene, Hypalon) Resistant to various chemicals, inorganic strong acids, alkalis, saline solutions, ozone and weather-resistant. Not resistant to aromatic and chlorinated hydrocarbons. 14° to 212°F -10° to 100°C Cast iron with IIR lining (Butyl) Good resistance to dilute inorganic acids, alkalis and saline solutions. Good weather resistance and very suitable for water and ozone. Low gas permeability. Unsuitable for oils and hydrocarbons. 14° to 248°F -10° to 120°C Cast iron with CR lining (chloroprene rubber, Neoprene) Resistant to various chemicals, dilute solutions of inorganic acids, alkalis and salts. Ozone and weather resistant. Very suitable for abrasive media. Not resistant to aromatic hydrocarbons. 14° to 212°F -10° to 100°C SG iron General industrial applications, water, alkaline inert media, gas and oil limited by diaphragm material Cast iron and SG iron with hard rubber lining Can be used for weak acids, waste water, brine, water treatment and cleaning, surface fi nishing, pickling and galvanising, sodium hydroxide, sodium chloride -4° to 248°F -20° to 120°C SG iron or ductile iron with PP lining Can be used for acids, waste water, brine, water treatment and cleaning, surface fi nishing, pickling and galvanising, the food industry, drinking water -4° to 248°F -20° to 120°C SG iron or ductile iron with PFA lining Very suitable for strong mineral, oxidative and inorganic acids. Resistant to bases, halogens, metal salts, organic acids, hydrocarbons, alcohols and aldehydes, ketones, ester and ammonia. PFA also has a higher resistance than other lining materials at higher temperatures. -4° to 248°F -20° to 120°C Stainless steel 1.4408 Can be used for pure media with limited aggressive chemicals and environments limited by diaphragm material Stainless steel 1.4435 Can be used for pure media, meets the requirements of the pharmaceutical and food industry as well as biotechnology, resistance to aggressive fl uids for the external cleaning of the valves limited by diaphragm material Stainless steel 1.4408 with PFA lining See SG iron with PFA lining. An additional advantage is the resistance of the valve body to an aggressive environment limited by diaphragm material * The temperature data are recommendations for the material and refer to water above freezing point. The actual application temperatures of the valves depend on the working medium, the operating pressure, the nominal size, the diaphragms and the actuator. The plant operator is responsible for careful selection of valves and materials for their processes. NOTE: Careful consideration should be given to specifying body materials when used at or below freezing point outside temperatures (which may be seasonal) unless suitably insulated.