Steel Valve
Iron Valve
Fittings and Accessaries
Non-Rising Stem Wafer Knife Gate Valve
Knife gate valve is a specialized industrial valve engineered for reliable on/off flow control of media containing solid particles, slurries, viscous fluids, and fibrous materials—scenarios where standard gate valves easily clog or fail. Featuring a sharp, precision-machined knife-like gate (blade), this valve can effortlessly cut through thick slurries, pulp, sludge, and granular media, ensuring unobstructed flow and tight shutoff even in harsh industrial environments. Crafted from high-grade materials with optional corrosion-resistant linings, it is optimized for compact installation, low maintenance, and long service life, making it the preferred choice for global industries handling challenging media, including mining, wastewater treatment, pulp & paper, and chemical processing.
Features
-Sharp Knife-Like Gate Design: Precision-machined stainless steel or alloy blade with a sharp edge, capable of cutting through viscous slurries, fibrous materials, and solid-laden media without clogging—eliminating the risk of valve jamming common in standard gate valves. The gate’s lifting motion also scrapes off media adhesion on the sealing surface, automatically cleaning debris for consistent performance.
-Anti-Clogging & Full-Port Design: Smooth, cavity-free valve body with no grooves on the sealing surface, preventing media deposition and ensuring flexible opening/closing. When fully open, the gate retracts completely, providing a full-port flow path with minimal pressure loss and turbulence.
-Reliable Sealing Performance: Available in soft sealing (EPDM/PTFE) for tight shutoff (zero leakage) in low-to-medium pressure applications and metal-to-metal hard sealing (stellite overlay optional) for high-temperature, abrasive media. Bi-directional sealing options are also available for versatile pipeline installation.
Technical Specifications
-Design Standard:MSS SP-81
-End Connection:Wafer,Lug,Flange
-Face to Face:MSS SP-81
-Test Standard: MSS SP-81
-Working Pressure:2bar -16bar
-Size:NPS 2″~48″(DN50~DN1200), up to DN1800 available for large-scale mining and wastewater applications
-Flange Connection: ASME CLASS 150~300（PN6~PN25）
-Body Material: Ductile Iron,Carbon steel, Stainless steel, Alloy steel, Duplex stainless steel
-Seal Material:NBR,EPDM,FKM,Metal,Ceramic
-Type : Uni-directional Seal,Dual-directional Seal,Through Conduit Type,Slurry Knife Gate Valve,2-PC Structure type
-Operation:Manual hand wheel,Gearbox,Electric,Pneumatic actuation (single-acting/double-acting),Bare shaft with ISO top flange, etc.
Application
-Temperature Range:
- Soft Sealing (EPDM/PTFE): -10℃ ~ 80℃
- Metal Hard Sealing: -29℃ ~ 425℃
- Ceramic Lining: -20℃ ~ 300℃
-Primary Media: Slurries (mining tailings, coal slurry, ore slurry), pulp & paper stock, wastewater, sludge, fly ash, granular materials, viscous fluids, chemical slurries, food pastes, and other media containing solid particles or fibrous materials.
-Applicable Scenarios: Mining industry (ore processing, tailings handling), wastewater treatment plants (sludge and sewage control), pulp & paper mills (pulp and fiber suspension), chemical plants (corrosive slurry handling), power plants (fly ash and flue gas desulfurization systems), food & beverage industry (viscous ingredients), and offshore/marine slurry transfer systems—all scenarios requiring reliable on/off control of challenging media.
