What material is used for the sealing surface of the coke oven flue damper valve?

The materials employed for the sealing surfaces of coke oven flue gate valves are diverse, with selection typically based on factors such as corrosion resistance, temperature tolerance, wear resistance, and sealing performance. Below are some common materials used for these sealing surfaces and their characteristics:

Rubber: Exhibits excellent elasticity and sealing properties, accommodating moderate deformation. Commonly employed for valve sealing surfaces handling ambient temperature and low-pressure media. Within coke oven flue gate valves, rubber sealing surfaces may be utilised in applications demanding high sealing integrity yet operating under relatively low temperature and pressure conditions. Common rubber compounds include nitrile rubber and fluorinated rubber, which also possess reasonable resistance to oils, temperatures, and corrosion.

Plastics: Materials such as polytetrafluoroethylene (PTFE) exhibit outstanding chemical stability, corrosion resistance, self-lubrication, and low friction coefficients. They resist corrosion from virtually all chemical media, making them suitable for valves handling corrosive or high-purity substances. Within coke oven flue environments, PTFE sealing surfaces effectively withstand gas corrosion while maintaining long-term sealing performance.

Copper Alloys: Possess good wear resistance, corrosion resistance, and thermal conductivity. Suitable for media such as water, seawater, and steam, they are commonly used in low-pressure, small-to-medium diameter gate valves and globe valve sealing surfaces. In coke oven flue gate valves, copper alloy sealing surfaces may be employed in applications demanding higher wear and corrosion resistance.

Chromium stainless steel: Exhibits excellent corrosion resistance, erosion resistance, and heat resistance, suitable for media such as steam and nitric acid. Within coke oven flue environments, chromium stainless steel sealing surfaces withstand high temperatures and flue gas corrosion to maintain stable valve sealing.

Special Alloys: Materials such as Stellite alloys and nickel-based alloys possess exceptional high-temperature resistance, corrosion resistance, and wear resistance, ensuring reliable sealing under extreme conditions. In coke oven flue gate valves, special alloy sealing surfaces may be employed in high-temperature, high-pressure, and highly corrosive applications.

In summary, the selection of sealing surface materials for coke oven flue gate valves requires comprehensive consideration of specific operating conditions and medium characteristics. Each material possesses unique properties and suitable applications to ensure long-term stable valve operation and safe production.