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Knife gate valve, also known as knife gate valve, knife type slurry valve, its opening and closing part is a gate, the movement direction of the gate is perpendicular to the direction of the fluid, and the medium is cut off by a blade-shaped gate that can cut fiber materials. Two sealing surfaces, the two sealing surfaces of the most commonly used mode gate valve form a wedge, the wedge angle varies with the valve parameters, usually 50, the gate of the wedge type knife gate valve can be made into a whole, called rigid gate ; It can also be made into a gate that can produce a small amount of deformation to improve its manufacturability and make up for the deviation of the sealing surface angle during processing. This gate is called an elastic gate. There is actually no chamber in the valve body, the gate rises and falls in the side guide groove, and is pressed against the valve seat by the lugs at the bottom. If a higher medium sealing performance is required, an O-ring sealing valve seat can be used to achieve Two-way sealing. Knife gate valve has small installation space, low working pressure, not easy to accumulate debris, and low price.
When the knife gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, relying on the medium pressure to press the sealing surface of the gate to the valve seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. The gate valve is forcibly sealed, that is, when the valve is closed, the gate must be forced against the valve seat by external force to ensure the tightness of the sealing surface. This type of valve should generally be installed horizontally in the pipeline.
Knife gate valve drive mode: manual, electric, pneumatic, hydraulic, bevel gear, electro-hydraulic and gas-hydraulic and other driving methods. Knife gate valve shape: open rod and dark rod. Knife gate valve material: cast iron, cast steel, carbon steel, stainless steel, fluorine-lined, etc. Knife gate valve seal: hard seal, soft seal, single-sided seal, double-sided seal and other material seals.
The ultra-thin knife gate valve completely solves the large flow resistance of ordinary gate valves, flat gate valves, ball valves, globe valves, regulating valves, butterfly valves and other valves with its advantages of small size, small flow resistance, light weight, easy installation and easy disassembly , heavy weight, difficult installation, large floor space and other difficult problems. After the appearance of the knife gate valve, a large number of general-purpose shut-off valves and regulating valves have been replaced by them. Today, the world's largest use of knife gate valve is the United States and Japan.
Knife gate valves are used in the following areas:
1. Mining, iron and steel industry - used for coal, filter residue slurry, etc.;
2. Purification device - used for waste water, mud, dirt and clarified water with suspended solids;
3. Paper industry - used for any concentration of pulp, material-water mixture;
4. Power station ash removal - used for ash slurry.
performance:
1. It is used for near and remote control, and can also realize remote location display and remote centralized control according to the user's requirements.
2. Light weight: The body is made of carbon steel, which is about 20%-30% lighter than the traditional gate valve, and is easy to install and maintain.
3. The use of this valve can improve the closing and sealing performance of the conveying pipeline system, prevent leakage to the greatest extent, and will play a positive role in improving production efficiency and protecting the environment.
4. The sealing surface is made of high wear-resistant and corrosion-resistant ceramic materials, and inlaid technology is used, which has high corrosion resistance and good wear resistance, so that the valve has a long service life and the cost performance is 10 times higher than that of ordinary valves.
