Resilient renewable Seated,two-way sealing ,zero leakage,long lifetime,heat-resistant,corrosion resistance,well seal performance knife gate valveWith GS,CE certificate ... deposition of slag and jam.3, single seat, one-way sealing.4.the valve plate design is flat with blade ... slurry, pulp, sewage of solid, liquid-solid, andgas-solid two-phase medium conveying system in the pipeline for switching valves ...