What materials are used in butterfly valve seats?

Table of Contents

1. Introduction to Butterfly Valve Seats
2. Common Materials Used in Butterfly Valve Seats
   1. PTFE (Polytetrafluoroethylene)
   2. EPDM (Ethylene Propylene Diene Monomer)
   3. NBR (Nitrile Butadiene Rubber)
   4. Viton (Fluorocarbon Elastomer)
   5. Metal Seats
3. Sansheng Fluorine Plastics Company Solutions
4. References

Introduction to Butterfly Valve Seats

Butterfly valves are widely used in various fluid control applications. One of the critical components of a butterfly valve is its seat, which must ensure a tight seal against the disk while enduring pressure, temperature variations, and chemical exposure. The choice of seat material is vital for achieving operational efficiency and longevity.

Common Materials Used in Butterfly Valve Seats

PTFE (Polytetrafluoroethylene)

PTFE is renowned for its excellent chemical resistance and low friction properties. It is suitable for applications where aggressive chemicals are present. PTFE can operate effectively within a temperature range of -73°C to 260°C.

EPDM (Ethylene Propylene Diene Monomer)

EPDM is a versatile rubber material known for its durability and excellent resistance to heat, ozone, and weathering. It is particularly effective in water, alkali, and some acidic applications, with a temperature range of -45°C to 120°C.

NBR (Nitrile Butadiene Rubber)

NBR is widely used in the oil and gas industries due to its exceptional resistance to petroleum-based fluids. NBR seats are suitable for temperatures ranging from -34°C to 121°C.

Viton (Fluorocarbon Elastomer)

Viton offers superior performance in high-temperature applications (up to 204°C) and provides excellent chemical resistance. However, it is more costly compared to other materials, and its flexibility at low temperatures (-20°C) is limited.

Metal Seats

Metal seats are used in high-temperature and high-pressure applications where soft-seated materials would fail. They are robust and provide long life in extreme conditions but might require greater force to close, potentially affecting sealing efficiency.

Sansheng Fluorine Plastics Company Solutions

Sansheng Fluorine Plastics specializes in advanced fluoropolymer solutions for butterfly valve seats. Their products include a range of high-performance PTFE composites, designed to enhance durability and chemical resistance, suitable for extreme environments.

References

[1] Engineering Fundamentals of Butterfly Valves, Journal of Fluid Mechanics.

[2] Materials Selection in Mechanical Design, Fourth Edition, Elsevier.

[3] Sansheng Fluorine Plastics Company Product Catalog.