The lining material for the lined valve
Lined valve, is a type of fluorine plastic lined corrosion-resistant valve, which lined fluorine resin (or by special processing) in steel or iron valve pressure bearing inner wall or the surface of inner parts bt the molding or injection process for strong corrosion medium. Simply put, the lining material needs to be filled in the valve body where the medium can reach. Fluorine lined valves can be used in all concentrations of sulfuric acid, hydrochloric acid, hydrofluoric acid, aqua regia and various organic acids, strong acids, strong oxidants, and other solid media, but is limited to temperature (for medium-range form -50℃to150℃). The valves that can be manufactured with lined plastic include lined butterfly valves, lined ball valves, lined globe valves, lined plug valves, lined gate valves, lined cock valves, etc. There are many fluorinated materials that can be used for lining valves. The most commonly used materials are FEP (F46) and PCTFE (F3). Today, we will introduce the characteristics and applications of these materials for you, if interested in, please read on!
| Materials | Working temperature | Working conditions | Features |
| PTFE（F4） | -180～200℃ | Strong acid, base, oxidant, etc | Excellent chemical stability and corrosion resistance, good electrical insulation, heat resistance, self-lubricity;
Corroded by molten alkali metal, low friction coefficient, but poor fluidity, large thermal expansion, need sintering molding instead injection molding. |
| PVC | 0～55℃ | Resistant to water, alkali, non – oxidizing acid, chain hydrocarbon, oil and ozone | High mechanical strength, excellent chemical stability and electrical conductivity, good aging resistance, easy fusion and bonding, low price. |
| FEP（F46） | -85～150℃ | Any organic solvents or reagents, dilute or concentrated inorganic acids, bases, ketones, aromatics, chlorinated hydrocarbons, etc.; | The mechanical and electrical properties and chemical stability are basically similar to F4, but with high dynamic strike toughness and excellent weather resistance and radiation. |
| PCTEF(F3) | -195～120℃ | Various organic solvents, inorganic corrosion fluids (oxidizing acids) | The heat resistance, electrical property and chemical stability are next to F4, and the mechanical strength, creep property and hardness are better than F4. |
| PVDF（F2） | -70～100℃ | Most chemicals and solvents | Good toughness, easy to form. Tensile strength and compression strength are better than F4 and can withstand bending, radiation, light and aging, etc |
| RPP | -14～80℃ | An aqueous solution of inorganic salts, dilute or a concentrated solution of an inorganic acid/base; | One of the lightest plastics. Its yield, tensile and compressive strength and hardness are better than those of low-pressure polyethylene.
Good heat resistance, easy to form, cheap price. It’s dynamic impact, fluidity and bending elastic modulus are improved after modification, . |
| PO | -58～80℃ | Various concentrations of acid, alkali salts and some organic solvents; | The most ideal anticorrosive material has been widely used in rotary forming large equipment and pipelining. |
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