Knife gate valve
A knife gate valve uses a relatively thin gate that travels across the flow path to open or isolate the line. Its gate geometry and travel distinguish it from conventional wedge and parallel-slide gate valves, but body arrangement, seat design, pressure direction, and unidirectional or bidirectional capability vary by construction. Selection should consider the actual medium, solids or deposits, operating frequency, required shutoff, and installation direction. Suitability for slurry or fibrous service must be confirmed for the selected design rather than assumed for every knife gate valve.
Application and duty
Isolation duty where a knife-style sliding gate is appropriate; gate and seat compatibility with the medium and pressure direction must be verified for the selected design.