Diaphragm Valve Lining Options

Diaphragm Valves are designed for leak-proof control of abrasive and corrosive liquids, suspensions, slurries, and pulps. Tru-Tech’s diaphragm valves are specifically designed to handle higher pressure and impose the least amount of pressure drop with a more laminar flow pattern. Diaphragm Valves are ideally suited for chemical, acid and base applications with the appropriate selection of body materials, lining and diaphragm materials.

SOFT NATURAL RUBBER: Good in either wet or dry abrasive services, water, and some acids and alkalis. Soft natural rubber has one of the best abrasion resistances when strong chemicals are not present. Temperature ‐30 to 180°F

HARD RUBBER: Hard rubber is a good general chemical resistant lining that can be used in higher temperatures than its soft counterpart. Temperature ­‐30 to 200°F

GRAPHITE BASED HARD RUBBER: Graphite hard rubber has a good chemical resistance and at higher temperatures than the normal hard and soft natural rubbers. Max Temperature 250°F

EPDM: (Ethylene Propylene Diene Monomer) The most popular general­‐purpose material. Excellent chemical resistance to a wide variety of corrosive elements including acids, caustics and hot water. It is abrasion resistant and good for high temperature services. EPDM has poor oil resistance. It is also satisfactory for intermittent steam sterilization. Temp ‐30 to 300°F

NEOPRENE: Widely used in wastewater applications. A good choice for general-­‐purpose chemical resistance where the media contains entrained oils. It also resists aldehydes, certain alcohols, fertilizers, explosives, petroleum, air, acids alkalis, and is abrasive resistant. Finally, in most cases is interchangeable with Buna­‐N (Nitrile) Rubber. Temperature -‐30 to 200°F

BUNA-‐N: (Nitrile Butadiene Rubber) is a general‐purpose oil resistant polymer known as nitrile rubber. It is a copolymer of butadiene and acrylonitrile. Buna‐N has a good solvent, oil, water, and hydraulic fluid resistance. It displays good compression set, abrasion resistance, and tensile strength. Nitrile should not be used in highly polar solvents such as acetone and methyl ethyl ketone, nor should it be used in chlorinated hydrocarbons, ozone, or nitro hydrocarbons. In most cases it is interchangeable with Neoprene. Max Temperature 275°F

BUTYL: A good choice for gases because it has a very low vapor and gas permeability. Also good for many acids and alkalis. Good for applications involving steam sterilization. Temperature ­‐20 to +250°F

CHLOROBUTYL: Chlorobutyl has excellent abrasion and corrosion resistant properties. The maximum recommended temperature for Chlorobutyl is 180°F.

POLYPROPYLENE: A general purpose lining with good chemical and temperature resistance. Utilized for water treatment, chemical processing, most plating fluids, and steel mill pickling lines, foodstuff, and drinking water. Temp: ­‐10 to +200°F

ECTFE (HALAR): (Ethylene Chlorotrifluoroethylene) Excellent wear and abrasion qualities, excellent corrosion resistance, low coefficient of friction, and excellent electrical properties. Maximum use temperature 350°F

ETFE (TEFZEL): (Ethylene Tetrafluoroethylene) Outstanding resistance to chemicals and strong acids. Also has high abrasion resistance for tough services. Below 350°F has no known solvent.