اختيار صمام بوابة السكين للخدمة الشاقة لمخلفات التعدين والطين

However, standard unidirectional bonnetless knife gates (per MSS-SP-81) suffer from two major operational problems in heavy slurry: abrasive solids pack into the bottom seat groove, preventing full gate travel, and line pressure from the reverse direction forces the blade away from the single perimeter seal, causing massive downstream leakage.

For heavy slurry and tailings pipelines, heavy-duty bidirectional perimeter elastomer sleeve knife gate valves provide the premier engineering solution. These valves utilize two heavy-duty natural rubber or polyurethane sleeves pressed together in the center of the valve body. When the valve is open, the sleeves seal against each other, creating a 100% full-bore straight flow path that isolates the metal valve body from the abrasive media.

When closing, the beveled gate blade pushes between the two matching sleeves. As the gate slides downward, the elastomer sleeves wipe solids off the blade faces, discharging a minor fraction of slurry harmlessly out the open bottom rather than packing it into a bottom recess. SMD Flow Control manufactures slurry knife gate valves in ductile iron and cast steel with gate blades in 316SS, 2205 Duplex, and 17-4PH hardened stainless steel up to Class 300 pressure ratings.