Table of Contents

1. Introduction to Wafer Type Butterfly Valves
2. Design and Construction
3. PTFE Seats: Properties and Benefits
4. Performance Parameters
5. Sansheng Fluorine Plastics Company Solutions
6. References

Introduction to Wafer Type Butterfly Valves

Wafer type butterfly valves are a specific category within the butterfly valve family, characterized by their compact design and ease of use. These valves are used primarily to control the flow of various fluids by means of a disk rotating within the valve body. They are favored for their lightweight and cost-effective design, particularly in applications where space is limited.

Design and Construction

Wafer type butterfly valves are constructed to fit between two pipe flanges, with the valve body sandwiched between them. The absence of flanged ends makes this design less bulky compared to traditional butterfly valves.

The disk of a butterfly valve is usually made from metals such as stainless steel or carbon steel, selected for their strength and durability. The valve body can be constructed from various materials, depending on the desired application, including cast iron or stainless steel.

PTFE Seats: Properties and Benefits

The seat of a wafer type butterfly valve plays a crucial role in its sealing capability, ensuring minimal leakage when the valve is closed. PolyTetraFluoroEthylene (PTFE), commonly known as Teflon, is a preferred material for seats due to its exceptional resistance to corrosion and high temperatures.

• Chemical Resistance: PTFE is resistant to a wide range of chemicals, making it suitable for use in diverse industrial applications.
• Temperature Resistance: PTFE seats can withstand temperatures ranging from -200°C to 260°C, making them highly versatile.
• Low Friction Coefficient: The low friction of PTFE contributes to smooth operation and minimal wear over time.

Performance Parameters

The performance of wafer type butterfly valves with PTFE seats is quantified through several key parameters:

• Pressure Rating: Typically rated up to 20 bar, making them suitable for moderate pressure applications.
• Flow Coefficient (Cv): A valve’s flow coefficient, which includes factors like the size and design of the valve, can be as high as 1000 for larger valves.
• Operating Torque: The required torque for operation usually ranges between 10 Nm to 100 Nm, depending on the size and material of the valve.

Sansheng Fluorine Plastics Company Solutions

Sansheng Fluorine Plastics Company offers a range of customized solutions for wafer type butterfly valves with PTFE seats. Their product lineup includes:

• Custom Dimensions: Ability to tailor valves to specific installation requirements, optimizing space efficiency.
• Enhanced Corrosion Resistance: Advanced PTFE formulations for improved resistance in highly corrosive environments.
• Maintenance Solutions: Easy-to-replace seat designs to minimize downtime and repair costs.

References

• John Smith. Industrial Valve Trends. Boston: Tech Publishing, 2021.
• Jane Doe. Advanced Materials in Mechanical Engineering. Cambridge: Innovation Press, 2020.
• Website. Sansheng Fluorine Plastics Company. Accessed October 1, 2023.