Burner Line Knife Gate Valves
Material Isolation Valves
Stock® has developed a Knife Gate Burner Line valve in accordance with the National Fire Protection Association (NFPA) standard 85. The standard requires burner line isolation at the pulverizer and at the burners to provide safety during the operation and maintenance of pulverized fuel firing systems. Stock® Knife Gate Valves (KGV) are specially constructed valves designed for extreme service. This ability to isolate portions of the burner line allows routine maintenance to be performed safely.
These valves are also used for the isolation of material feed downspouts located between the pulverizer and feeder, allowing safe access and maintenance of the feeders without exposure to dangerous hot gas. Stock® Knife Gate Valves are designed for adverse conditions. They are made to handle high velocity mixture of air and pulverized coal.
Stock® KGVs meet the individual requirements necessary to provide containment of explosion pressures as required by the NFPA standard. Stock® KGVs feature a low profile that adapts to new installations or retrofits. Internal bore surfaces include a tungsten carbide surface treatment for long life. When retracted, no portion of the gate remains in the pipe, so the flowing material does not wear the gate edge. Because of the tight seal provided by the gate seating cams, there is minimal leakage of gas.