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Valve production for highly corrosive media involves molding or injecting fluorine resin into the pressure-bearing inner wall of a steel or iron valve, or coating the inner sections of the valve with fluorine resin. Lining material must be inserted into the valve body in passageways that will be used by the medium. Powerful acids, strong oxidants, and other solid media are no match for fluorine-lined valves. This includes sulfuric acid, hydrochloric acid, hydrofluoric acid, aqua regia, and a variety of organic acids. Temperature is the only limiting element in their use (for medium-range forms, the temperature range is between -50 degrees Celsius and 150 degrees Celsius). Examples of lined plastic-lined valves include butterfly valves, ball valves, globe valves, plug valves, gate valves, cock valves, and many more. Fluorinated materials come in a broad range and may be used to line valves. Common materials include polytetrafluoroethylene (PTFE) and fluoroethylene polymer (FEP) (F46) (F3). Please keep reading if you’re interested in learning more about the properties and applications of these materials today.
It is generally known that a significant number of today’s firms include the usage of chemicals in the day-to-day operations of their production processes. These chemicals may be in the form of solids or liquids, and they are kept in basins that are connected by pipes to the areas of the facility that make use of them. Pipes and storage tanks need to be made of materials that are resistant to the chemical conditions in which they are placed in order to ensure that they are safe and to avoid any potential hazards from occurring.
In the field of chemical manufacturing, lined valves provide a solution that is efficient, free of danger, and trustworthy in the event of any level of corrosion flow. The lining that covers the interiors of the valves and fittings provides both the chemical resistance and durability that are required of these components. Every one of the wetted surfaces of a lined valve is made up of a polymeric material, which is almost often a fluorocarbon. It is common to practice making the metallic components of a lined valve out of low-priced materials like ductile iron in order to keep production costs down. When a valve is completely lined, the medium that travels through it does not have any interaction with the metal elements that make up the valve.
Teflon, commonly known as PTFE, is a polymer compound that is produced by polymerizing tetrafluoroethylene. PTFE is also known by its trade name, Teflon. It has excellent chemical stability, resistance to corrosion, sealing, high lubrication and non-viscosity, electrical insulation, and good aging resistance for media such as strong acids, strong alkalis, and strong oxidants. In addition, it does not have the viscosity of the oil. In addition to having poor fluidity, it has a large thermal expansion and may reach temperatures ranging from -200 to 180 degrees Celsius.
It is common practice in the chemical, electric equipment, pharmaceutical, petrochemical, fertilizer, and pulp and paper industries to use valves that are lined with PTFE when dealing with corrosive applications. These valves provide a very long lifetime in addition to a very high degree of resistance to chemical damage.
In the field of chemical manufacturing, lined valves provide a solution that is efficient, free of danger, and trustworthy in the event of any level of corrosion flow. The lining that covers the interiors of the valves and fittings provides both the chemical resistance and durability that are required of these components. PTFE-lined valves and PFA-lined valves are the two kinds of valves that are used the most often in corrosive applications in the chemical, pharmaceutical, petrochemical, fertilizer, and pulp and paper industries. Both types of valves are utilized in a variety of other sectors as well. In these particular applications, high-grade alloys are often utilized; hence, the usage of these valves is justified by the fact that the latter are more expensive alternatives. You need to be aware of the material differences between PTFE and PFA in order to comprehend the difference that exists between the two.
Teflon comes in a variety of types, the most prevalent of which is PTFE and PFA. Both PFA and PTFE have comparable chemical qualities, including exceptional resistance to stress breaking and mechanical tensile strength. It is suitable for molding, extrusion, injection, transfer molding, and other molding processing because of its good molding performance and wide processing range. It can be used for making wire and cable insulation sheaths, high-frequency insulation parts, chemical pipelines, valves, and pumps with corrosion-resistant lining; the Machinery industry with special spare parts; the textile industry with a variety of anticorrosive materials electrode; and so on.
Teflon, also known as PTFE, is a polymer compound that is formed by the polymerization of tetrafluoroethylene. Teflon possesses excellent chemical stability, corrosion resistance, sealing, high lubrication and non-viscosity, electrical insulation, and good aging resistance for media such as strong acids, strong alkalis, and strong oxidants. It has a low fluidity and a considerable thermal expansion, and its working temperature ranges from -200 to 180 degrees Celsius. PTFE-lined valves offer an exceptionally high level of chemical resistance and longevity, and they are suitable for widespread use in corrosive applications in a variety of industries, including those dealing with chemicals, electric machinery, pharmaceuticals, petrochemicals, fertilizers, pulp and paper, and metallurgy.
Polyfluoroalkoxy, most often known as PFA, is a high-performance thermoplastic polymer that was created from PTFE. It has improved viscosity. The performance of PFA is just as outstanding as that of PTFE, but it outperforms PTFE in terms of flexibility. PTFE is the version of Teflon that is more known to the general public. PFA resins are capable of being melted, which sets them apart from PTFE resins in a significant way. PFA has a density ranging from 2.13-2.16 (g/cm3) and a melting point of around 580 degrees Fahrenheit. Even at a temperature of 210 degrees Celsius, it may be operated for up to 10000 hours since its service temperature ranges from -250 to 260 degrees Celsius. It has exceptional chemical resistance, including resistance to any strong acid (even water), strong alkali, and grease; it is insoluble in any solvent; it ages well; nearly no sticky substances can attach to its surface, and it does not burn at all. Elongation (%) more than 250, tensile strength (MPa) greater than 23.
The overall performance of PFA-lined valves is much higher than that of PTFE-coated valves in almost all cases. PFA is used more often in industrial applications, notably industrial tubing and valves. On the other hand, PTFE valves are more widespread and popular because of their lower cost. PFA-lined valves are suitable for the transportation of liquid and gas media in a variety of industrial pipelines. These liquid and gas media include sulfuric acid, hydrofluoric acid, hydrochloric acid, nitric acid, and other highly corrosive media. PFA-lined valves guarantee high sealing performance over a wide range of pressure and temperature difference.
Teflon-coated valves are gaining popularity for a variety of reasons, including those listed below.
When it comes to industrial process control, actuated valves, and flow components, GMK is the market leader. We have been supplying cutting-edge valves and actuation to businesses of all sizes, from specialty tool makers to the Fortune 500, for more than 30 years.
To complement our regular actuated valve assemblies, we provide a wide selection of useful extras. Moreover, we provide comprehensive bespoke valve actuation services, including the delivery of unique automated valve assemblies designed specifically for the goods or applications you specify. AutoCAD, Solidworks, and other mainstream CAD applications are all supported in full.
GMK offers a variety of Line Valves. Our top sellers in this category are;
Fluorine lined Ball Valve, Four-way Plug Valve, GMK PTFE Lined DC-type Globe Valve, Half PTFE Lined Butterfly Valve.
We want to dominate the global market for actuated valves. As such, we work hard to streamline the processes of choosing, estimating, and delivering actuated valves and other flow components of the highest quality.