A knife gate valve is a type of industrial valve used to control the flow of liquid and gas in a number of industrial applications including mining operations and wastewater treatment plants. They are ideal for controlling abrasive materials such as minerals, slurries, pastes, and powders due to their tight shutoff capabilities. In addition to these uses, they can also be employed for regulating granular media like coal dust, sand, and gravel. They are often used when controlling large amounts of material or in situations where high levels of pressure are needed. These valves are often used in applications where a seal must be maintained on both sides of the blade when closed.
The basic design consists of a flat plate with an angled edge. This cutting edge allows for the valve to cut through various materials, including thicker or fibrous products that may otherwise be difficult to open or close with other types of valves. Additionally, many knife gate valves are self-cleaning, which means that the cutting action of the blade helps reduce clogging and buildup over time while allowing smooth operation at all times. These valves are available in several materials including ductile iron and stainless steel. Furthermore, some models are designed specifically to be used with corrosive medias or within extreme temperatures.
Knife gate valves offer many advantages over traditional gate valves including superior sealing capabilities, low-cost maintenance, and leak prevention. One of the main advantages of using a knife gate valve is its ability to cut through tough materials that can cause clogging in regular gates. The sharp-edged blade design allows for quick opening or closing without causing damage to the seat or inner body which reduces overall maintenance costs long term.
The most common type of knife gate valve is called a unidirectional knife gate valve. This features a single blade that moves up and down to open or close the valve. This can be operated via a manual handwheel, a pneumatic actuator/cylinder, or an electric actuator. 
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