Shanghai Jonloo Machine MFG Co., Ltd.
The Lining Material for Lined Valves
Mar 13, 2023
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The lining material for valves
When it comes to valves, there are several types of linings that can be used depending on the specific needs of the application.
Some common types of valve linings include:
1. Rubber linings: These are often used in valves that handle abrasive materials or fluids that contain corrosive chemicals.
Rubber linings can help to protect the valve body from damage and extend the lifespan of the valve.
2. PTFE linings: PTFE (polytetrafluoroethylene) is a type of plastic that is known for its non-stick properties and resistance to chemicals. PTFE linings can be used in valves that handle highly corrosive fluids or gases.
3. Ceramic linings: Ceramic linings are often used in valves that handle abrasive materials such as slurries or powders. The
hardness and durability of ceramics make them an ideal choice for these applications.
4. Metal linings: Metal linings can be used in valves that handle high-pressure fluids or gases. The metal lining can help to prevent leaks and ensure that the valve operates safely and efficiently.
Overall, the choice of valve lining will depend on the specific needs of the application and the materials being handled.
Where to use the lined valves
Lined valves are typically used in industries where the fluid being transported can be corrosive or abrasive to the valve
material. The lining material used in the valve helps to protect the valve from damage and extend its lifespan. Some
common industries where lined valves are used include chemical processing, oil and gas, and wastewater treatment.
In addition to protecting the valve from corrosion and wear, lined valves can also help to prevent contamination of
the fluid being transported. This is particularly important in industries where purity is critical, such as pharmaceuticals
or food processing.
Overall, lined valves are a reliable and effective solution for industries that require durable and corrosion-resistant valves.
What is the advantage of lined valves
Lined valves have several advantages over traditional valves. One of the main advantages is that they are designed to
resist corrosion and erosion, which can be a major issue in industrial settings. The lining material, which is typically
made of a polymer such as PTFE, acts as a barrier between the valve body and the fluid being transported, protecting
the valve from damage.
Another advantage of lined valves is that they are highly resistant to chemical and thermal degradation. This makes
them ideal for use in industries that handle corrosive or abrasive fluids, such as chemical processing or mining.
Lined valves also tend to have a longer lifespan than traditional valves, which can save companies money in the long
run. Additionally, they require less maintenance, which can reduce downtime and increase productivity.
Overall, lined valves are a reliable and cost-effective solution for industries that require durable and corrosion-resistant valves.
The comparison between lined valves and stainless steel valves
Lined valves are typically made of a metal body with a lining made of a non-metallic material such as PTFE, rubber, or ceramic. The lining provides protection against corrosion and chemical attack,
making them ideal for use in harsh environments. Lined valves are often used in the chemical, pharmaceutical, and food
industries.
On the other hand, stainless steel valves are made entirely of stainless steel and are known for their strength and durability.
They are resistant to corrosion and can withstand high temperatures and pressures, making them suitable for use in a variety
of industries, including oil and gas, power generation, and water treatment.
In terms of cost, lined valves tend to be more expensive than stainless steel valves due to the added cost of the lining material.
However, lined valves can provide a longer service life in harsh environments, which can ultimately save money in the long run.
Ultimately, the choice between lined valves and stainless steel valves will depend on the specific application and the environment
in which they will be used.
When it comes to valves, there are several types of linings that can be used depending on the specific needs of the application.
Some common types of valve linings include:
1. Rubber linings: These are often used in valves that handle abrasive materials or fluids that contain corrosive chemicals.
Rubber linings can help to protect the valve body from damage and extend the lifespan of the valve.
2. PTFE linings: PTFE (polytetrafluoroethylene) is a type of plastic that is known for its non-stick properties and resistance to chemicals. PTFE linings can be used in valves that handle highly corrosive fluids or gases.
3. Ceramic linings: Ceramic linings are often used in valves that handle abrasive materials such as slurries or powders. The
hardness and durability of ceramics make them an ideal choice for these applications.
4. Metal linings: Metal linings can be used in valves that handle high-pressure fluids or gases. The metal lining can help to prevent leaks and ensure that the valve operates safely and efficiently.
Overall, the choice of valve lining will depend on the specific needs of the application and the materials being handled.
Where to use the lined valves
Lined valves are typically used in industries where the fluid being transported can be corrosive or abrasive to the valve
material. The lining material used in the valve helps to protect the valve from damage and extend its lifespan. Some
common industries where lined valves are used include chemical processing, oil and gas, and wastewater treatment.
In addition to protecting the valve from corrosion and wear, lined valves can also help to prevent contamination of
the fluid being transported. This is particularly important in industries where purity is critical, such as pharmaceuticals
or food processing.
Overall, lined valves are a reliable and effective solution for industries that require durable and corrosion-resistant valves.
What is the advantage of lined valves
Lined valves have several advantages over traditional valves. One of the main advantages is that they are designed to
resist corrosion and erosion, which can be a major issue in industrial settings. The lining material, which is typically
made of a polymer such as PTFE, acts as a barrier between the valve body and the fluid being transported, protecting
the valve from damage.
Another advantage of lined valves is that they are highly resistant to chemical and thermal degradation. This makes
them ideal for use in industries that handle corrosive or abrasive fluids, such as chemical processing or mining.
Lined valves also tend to have a longer lifespan than traditional valves, which can save companies money in the long
run. Additionally, they require less maintenance, which can reduce downtime and increase productivity.
Overall, lined valves are a reliable and cost-effective solution for industries that require durable and corrosion-resistant valves.
The comparison between lined valves and stainless steel valves
Lined valves are typically made of a metal body with a lining made of a non-metallic material such as PTFE, rubber, or ceramic. The lining provides protection against corrosion and chemical attack,
making them ideal for use in harsh environments. Lined valves are often used in the chemical, pharmaceutical, and food
industries.
On the other hand, stainless steel valves are made entirely of stainless steel and are known for their strength and durability.
They are resistant to corrosion and can withstand high temperatures and pressures, making them suitable for use in a variety
of industries, including oil and gas, power generation, and water treatment.
In terms of cost, lined valves tend to be more expensive than stainless steel valves due to the added cost of the lining material.
However, lined valves can provide a longer service life in harsh environments, which can ultimately save money in the long run.
Ultimately, the choice between lined valves and stainless steel valves will depend on the specific application and the environment
in which they will be used.
| 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. |
