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Why are fluorine-lined butterfly valves so popular?

2023-12-03

Introduction to fluoroplastics:
Fluoroplastic is a general term for a class of polymer synthetic materials whose molecular structure contains fluorine atoms. It is a type of synthetic resin formed by the self-polymerization of fluorine-containing unsaturated monomers and the copolymerization of fluorine-containing unsaturated monomers.

There are many varieties of fluororesin, and they are divided into the following varieties according to the number of fluorine atoms in the molecule:

Polyvinyl fluoride (PVF), referred to as F1;

Polyvinylidene fluoride (PVDF), referred to as F2;

Polychlorotrifluoroethylene (PCTFE), referred to as F3;

Polytetrafluoroethylene (PTFE), referred to as F4;

Polyhexafluoropropylene, referred to as F6.

Fluorine-containing plastic copolymers are available in the following varieties:

Soluble polytetrafluoroethylene, referred to as PFA, is composed of polytetrafluoroethylene and perfluoroalkyl vinyl ether copolymer;

Polyperfluoroethylene-propylene (FEP), referred to as F46, is a copolymer of tetrafluoroethylene and hexafluoroethylene;

F42 is the abbreviation of the copolymer of tetrafluoroethylene and vinylidene fluoride;

F40 is the abbreviation of copolymer of tetrafluoroethylene and ethylene;

F30 is the abbreviation of copolymer of trifluoroethylene and ethylene;

F23 (also known as 3M) is the abbreviation of the copolymer of vinylidene fluoride and chlorotrifluoroethylene.

Since the molecular structure of fluoroplastics contains fluorine-carbon bonds and its shielding effect, it has excellent corrosion resistance, high (low) temperature resistance, non-adhesion, and electrical insulation.

Polytetrafluoroethylene (PTFE)
PTFE has high chemical corrosion resistance, and its corrosion resistance exceeds all existing plastics, so it is known as the "King of Plastics". PTFE is resistant to corrosion by almost any concentration of strong acids, alkalis, strong oxidants and solvents, and has no effect on it even at high temperatures.

The outstanding processing performance of polytetrafluoroethylene is that it is difficult to mold and process. It has no fluidity in the molten state and cannot transform from the "high elastic state" to the "viscous flow state" above the melting temperature. It is heated to its decomposition temperature (415°C). ) cannot flow either.

Therefore, it is difficult to use PTFE to manufacture parts with complex shapes using general thermoplastic processing methods such as molding and injection. PTFE powder can only be pre-pressed into the required shape and then sintered. Its coating is very microporous and cannot be used alone as an anti-corrosion coating.

Polyperfluoroethylene propylene plastic (FEP)

Polyperfluoroethylene has excellent corrosion resistance due to the extremely strong fluorocarbon bonds around the C-C bonds and its shielding effect. Similar to PTFE (at 150°C), it is resistant to corrosion by almost all chemical media (including concentrated nitric acid and aqua regia). Only fluorine, alkali metals, chlorine difluoride, chlorine trifluoride, etc. at high temperatures can interact with it. It has excellent corrosion resistance to dilute or concentrated inorganic acids, alkalis, alcohols, ketones, aromatic hydrocarbons, chlorinated hydrocarbons, greases, etc.

The outstanding advantage of F46 is that it has good molding and processing properties and can be processed by common molding and processing methods for thermoplastic plastics, such as molding, extrusion, injection, etc.

Soluble polytetrafluoroethylene plastic (PFA)

PFA polyperfluoroalkoxy. It has all the excellent properties of F4 without the disadvantage of difficult processing like F4. It has good thermal fluidity and is easy to process and form. It is also known as soluble polytetrafluoroethylene.

PFA has the advantages of both F4 and 46. It has the excellent chemical corrosion resistance and high temperature resistance of F4. Like F46, it can be formed and processed using general thermoplastic processing methods, and is more convenient than F46. PFA is used industrially as anti-corrosion linings and anti-corrosion coatings. Can be used to manufacture pumps, tank linings, bellows, expansion tubes, special hoses, films, etc.

Fluorine lined valve type

Fluoroplastic lined gate valve

The structure of the flange-connected fluoroplastic-lined gate valve is basically the same as that of conventional general-purpose valves, and it complies with the general technical conditions of general-purpose valves. The difference is that the interior is lined with a layer of fluoroplastic, which is difficult to manufacture. The mold making is more complicated and the production cost is high. high. Therefore, fluoroplastic-lined valves are more expensive than similar general-purpose valves.

The difference is that:

When the gate is opened or closed, there are limit devices and position indicators to prevent damage to the lining material of the valve sealing surface, ensuring the safety of the valve and extending its service life. There is a drain hole in the bottom of the valve or in the valve cover to vent pressure and residue. Fluoroplastic lined gate valve has a straight flow channel with smooth inner wall and small flow resistance coefficient. It is suitable for connecting and cutting off media in petrochemical, food, pharmaceutical and other pipelines.

Fluoroplastic lined ball valve

Fluorine plastic lined ball valve has a smooth inner wall, straight flow channel, and small fluid resistance, almost close to zero. Therefore, it is particularly suitable for industrial pipelines with small fluid resistance. Because of its simple structure and easy operation, it has become the first choice in some strong acid, strong alkali and various corrosive medium pipelines.

Fluoroplastic lined butterfly valve

Like general butterfly valves, fluoroplastic lined butterfly valves have a butterfly-shaped closing member (butterfly plate) that rotates around an axis perpendicular to the flow direction of the medium. There is a 0-90° limit block on the valve shaft to control the opening and closing of the butterfly valve. The valve body and butterfly plate are covered with a certain thickness of fluoroplastic. In order to facilitate assembly and molding, the valve body is often divided into two halves. Made into a clamp shape. And fasten the two halves of the valve body with countersunk screws.

The butterfly plate and valve stem are integrated into a single unit, which is simple and strong and can withstand large opening and closing torques. The shaft seals at both ends can use F4 packing or coated plastic rubber rings. Fluorine plastic lined butterfly valves have developed rapidly, and the diameter DN has reached 1200mm. The pressure also reaches 1.6Mpa.

The centerline sealing structure is already very mature, and fluoroplastic-lined butterfly valves with two-eccentric and three-eccentric structures are also being developed. Due to their simple structure and easy operation, fluoroplastic-lined butterfly valves are particularly suitable for petrochemical pipelines.

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