What is a knife gate valve?
Knife gate valve is also known as slurry valve. Its opening and closing parts are gate. The movement direction of the gate is perpendicular to the fluid direction. The medium is cut off by the knife edge gate which can cut fiber materials. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used gate plate valve form a wedge. The wedge angle varies with the valve parameters, usually 5°, The gate of wedge knife gate valve can be made into a whole, which is called rigid gate valve; It can also be made into a ram that can produce slight deformation to improve its manufacturability and make up for the deviation of the angle of the sealing surface in the processing process. This kind of ram is called elastic ram. In fact, there is no chamber in the valve body. The gate rises and falls in the side guide groove and is tightly pressed on the valve seat by the lug at the bottom. If it is necessary to achieve high medium tightness, the O-shaped sealing valve seat can be selected to realize two-way sealing. Knife gate valve has small installation space, low working pressure, not easy to accumulate sundries and low price.
When the knife gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, the sealing surface of the gate valve can be pressed to the valve seat on the other side by the medium pressure to ensure the sealing of the sealing surface, which is self sealing. Most gate valves are forced sealed, that is, when the valve is closed, the gate valve should be forced to the valve seat by external force to ensure the sealing of the sealing surface. This type of valve shall generally be installed vertically in the pipeline.
Driving mode of knife gate valve: manual, sprocket, electric, pneumatic, hydraulic, bevel gear, electric control, hydraulic and pneumatic. Knife gate valve shape: rising stem and Non rising stem. Knife gate valve material: cast iron, cast steel, carbon steel, stainless steel, fluorine lining, etc.
Knife gate valve seal: hard seal, soft seal, single-sided seal, double-sided seal and other materials.
With the advantages of small volume, small flow resistance, light weight, easy installation and disassembly, the ultra-thin knife gate valve completely solves the difficult problems of large flow resistance, heavy weight, difficult installation and large floor area of ordinary gate valve, flat gate valve, ball valve, stop valve, regulating valve and butterfly valve. After the emergence of knife gate valve, a large number of general cut-off valves and regulating valves have been replaced. The world’s largest consumption of knife gate valves is the United States and Japan.
The application scope of knife gate valve is:
1. Mining, coal washing and iron and steel industry – used for coal washing pipeline, slag slurry pipeline and ash discharge pipeline;
2. Purification device – used for waste water, mud, dirt and clarified water with suspended solids;
3. Paper industry – used for pulp, feed and water mixtures of any concentration;
4. Power plant ash removal – used for ash slurry.
China knife gate valve manufacturer www.sfutube.com supplies knife gate valve for industrial use, in kinds of materials such as carbon steel, stainless steel, alloy steel, etc.