ľ¹ÏÊÓƵ

Commonly used sealing components for valves can vary depending on the type of valve, its intended application, and the specific requirements of the system. Here are some of the materials frequently used for sealing components in valves:

Rubber (Elastomers):

Nitrile (Buna-N): Good resistance to oil, fuel, and water. Commonly used in low-pressure applications.

EPDM (Ethylene Propylene Diene Monomer): Excellent resistance to water, steam, and weather. Suitable for a wide temperature range.

Viton (Fluoroelastomer): High resistance to chemicals, oils, and high temperatures. Often used in demanding applications.

Neoprene: Good general-purpose elastomer with resistance to weather, oil, and some chemicals.

Silicone: Resistant to high temperatures, water, and steam. Often used in food and pharmaceutical applications.

PTFE (Polytetrafluoroethylene):

PTFE is known for its excellent chemical resistance and low friction properties. It is used for making gaskets, seals, and seat materials in valves handling corrosive fluids.

Graphite:

Graphite is used as a packing material for valve stem seals due to its self-lubricating properties and resistance to high temperatures.

Metal Seals:

Soft Metal Gaskets (e.g., Copper, Aluminum): These are often used in high-temperature applications where they can create a reliable seal under extreme conditions.

Spiral Wound Gaskets: These consist of alternating layers of metal and filler material, suitable for high-pressure and high-temperature applications.

O-Rings:

O-rings are typically made from rubber or elastomeric materials and are used in many types of valves to create a seal between stationary and moving parts.

Composite Seals:

Some modern valve designs utilize composite materials that combine the best properties of various materials. These can include rubber, PTFE, and metal components.

Glass-Reinforced PTFE:

Used in applications where PTFE's chemical resistance is required along with enhanced mechanical properties due to the reinforcement.

Ceramic Seals:

Used in extremely high-temperature and abrasive environments due to their resistance to wear and corrosion.

Plastics and Thermoplastics:

Depending on the application, certain thermoplastics can be used for sealing components due to their corrosion resistance, low friction, and chemical compatibility.

It's important to note that the selection of sealing materials depends on factors such as the fluid being handled, pressure and temperature conditions, chemical compatibility, and the specific requirements of the valve and its application. Different valves within the same system may also have different sealing materials based on their roles and responsibilities.