Diaphragm Valve Body 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.

• Cast Iron: A general‐purpose material suitable for water, air, petroleum products, most solvents, dry powders, and a wide variety of chemicals when used in the unlined state. This can also be lined with various rubbers and plastics to handle almost any process media.

• Ductile Iron: A general‐purpose material with usage similar to cast iron. Ductile iron however is much stronger and more capable where there may be high pipeline stresses, danger from impact, or concern from leakage upon line or valve fracture. Normally, ductile iron can be used as a direct replacement for steel valves. Can be lined with a wide variety of rubbers and/or plastics to handle almost any process media.

• Steel: Another general­‐purpose material that is somewhat resistant to corrosion then cast iron especially where water is the media. Steel is much stronger and like ductile iron much more capable where there may be high pipeline stress, danger from impact, or concern from leakage upon line or valve fracture. Can be lined with a wide variety of rubbers and/or plastics to handle almost any media.

• Stainless Steel: An alloy of iron, carbon, nickel, and chromium. Suitable for most foods, beverages, pharmaceuticals, solvents, sea water, oils, and some acids and alkalis.

• Alloy 20: Has higher amounts of nickel and chromium then 300 series stainless steels. It is mores resistant to sulfuric acid and is used widely in chemical processing and water treatment

• Bronze: Has a higher strength than pure copper. It is generally accepted as an industry standard for pressure rated valves and fittings. It is very resistant to pitting corrosion, with general resistance to most chemicals.

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

• 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.

• PTFE (XYLAN): (Polytetrafluoroethylene) Good wear resistance, low coefficient of friction, and fair corrosion resistance. Use Temperature 450­‐500°F

• PFA: (Perfluoroalkoxy) Good wear and abrasion qualities, excellent corrosion resistance, low coefficient of friction, and excellent release capabilities. Max use temperature 525°F

• PVDF (KYNAR): (Polyvinylidene Fluoride) Offers very low permeability. A strong, tough abrasion resistant fluorocarbon material resistant to most acids, bases, and organic solvents. It is ideally suited to handling wet or dry chlorine, bromine, and other halogens. Temperature ‐10 to +275°F.

• FEP: (Fluorinated Ethylene Propylene) Good wear and abrasion qualities, excellent corrosion resistance, low coefficient of friction, and excellent release characteristics. Max use temperature 400°F

• VITON: Offers exceptional resistance to oils, most chemicals and many solvents at elevated temperatures. It can be used in most applications involving mineral acids, salt solutions and chlorinated hydrocarbons. Viton is not recommended for ammonia, its derivatives or polar solvents, e.g. Acetone. ­‐20 to 300°F

• BLUE GLASS (CHEM): Intended for viscous chemical applications such as wastewaters where a smooth lining is necessary to prevent process media from sticking to the walls of the valve.

• GREEN GLASS (NON‐CHEM): Intended for non-­‐chemical applications such as wastewaters where a smooth lining is necessary to prevent viscous fluids from sticking to the walls.

• POLYURETHANE: Polyurethane has excellent abrasion resistance. Temperature ­‐30‐150°F

• FDA EPOXY: Good wear and abrasion qualities, good corrosion resistance. Max use temperature 212°F.

• PVC: PVC has resistance to a variety of chemicals including oxidizing acids and provides excellent abrasion resistance. Max use temperature 160°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

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