What is a Lined Ball Valve?
Lined Ball Valves are a type of ball valve which are made up of a body, stem, ball, seat and lining.
The interior is completely lined with a high quality PTFE or PFA lining material and due to its thickness it completely protects the valves against any chemical corrosion which makes it an excellent choice for any nasty applications.
They are also known as a Shut Off valve as some brands are engineered to include a free-floating ball design which promotes Positive shut – off across the pressure range, for example, the Flowserve Atomac Lined Ball Valve range.
Lined ball valve Lining Material
Lined ball valve is a type of fluorine plastic lined corrosion-resistant ball 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 ball valve 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℃). There are many fluorinated materials that can be used for lined ball valve. 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!
Lined ball valve lining material introduction
| 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. |
Benefits and Features of Lined Ball Valve
Benefits
- PFA liner is “locked-in” to body, ball, & stem. Eliminates liner collapse under vacuum.
- Injection molded PFA lining is free from pinholes, cracks, swelling, and local uneven thickness
- Excellent corrosion resistance due to PFA lining and TFM seats
- More economic than a valve made from high-alloy materials
- Low torque, smaller actuator, cost and weight saving
- High flow capacity & unrestricted flow
- Bi-directional bubble tight
- Easy for actuator automation
Features
- All wetted surfaces fully coated with PFA
- 2-piece off-center split body
- Anti-blowout stem
- Straight bore design
- Durable TFM seat, zero leak
- ISO-5211 mounting pad
Specifications of Lined Ball Valve
| Construction | Flanged, seat supported, full bore, PFA lined ball valve |
| Size range | DN 15 – 100 / NPS 1/2” – 6” |
| Face to face | EN 558, ASME B16.10 |
| Design standard | EN 12516, ASME B16.34, ASME B16.42 |
| Pressure ratings | EN PN 16, ASME Class 150 |
| Temperature range | -30 (-10) °C … +160 °C |
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