Knife Gate Valve

[Product Usage]

Knife gate valves are widely used in coal, filter residue slurry, wastewater, mud, sewage, pulp, ash slurry, etc. Knife gate valve, also known as knife gate valve or knife type slurry valve, has a gate valve as its opening and closing component. The direction of movement of the gate valve is perpendicular to the direction of the fluid, and the medium is cut off by a blade shaped gate valve that can cut fiber materials. The gate valve has two sealing surfaces, and the two sealing surfaces of the commonly used mode gate valve form a wedge shape. The wedge angle varies with the valve parameters, usually 50. The gate valve of the wedge type knife gate valve can be made as a whole, called a rigid gate valve; It can also be made into a gate that can produce slight deformation to improve its processability and compensate for the deviation of the sealing surface angle during the processing. This type of gate is called an elastic gate. The valve body actually does not have a chamber, and the gate plate rises and falls in the side guide groove, and is tightly pressed against the valve seat by the bottom protrusion. If high medium sealing performance is required, an O-shaped sealing valve seat can be used to achieve bidirectional sealing. Knife gate valve has a small installation space, low working pressure, is not easy to accumulate debris, and is relatively low in price.

[Driving Method]

Manual, chain wheel, electric, pneumatic, hydraulic, bevel gear, electrically controlled hydraulic, and pneumatic hydraulic drive modes. Knife type gate valve appearance: two types: open stem and concealed stem. Knife gate valve materials: cast iron, cast steel, carbon steel, stainless steel, fluorine lining, etc. Knife gate valve sealing: hard sealing, soft sealing, single-sided sealing, double-sided sealing and other materials for sealing.

The ultra-thin knife gate valve solves the difficult problems of high flow resistance, heavy weight, difficult installation, and large footprint of ordinary gate valves, flat gate valves, ball valves, globe valves, regulating valves, butterfly valves, and other types of valves due to its advantages of small volume, low flow resistance, light weight, easy installation, and easy disassembly. After the emergence of knife gate valves, a large number of general-purpose cut-off valves and regulating valves have been replaced by them. As of today, the United States and Japan have the largest global usage of knife gate valves.

[Product Performance]

1. Valve control can be controlled locally and remotely, and can also achieve remote position display and centralized control according to user requirements.

2. Lightweight: The body is made of carbon steel, which reduces the weight by about 20% -30% compared to traditional gate valves, making installation and maintenance convenient.

3. The use of this valve can improve the sealing performance of the conveying pipeline system, minimize leakage, and play a positive role in improving production efficiency and protecting the environment.

4. The sealing surface is made of highly wear-resistant and corrosion-resistant ceramic materials, and adopts inlay technology, which has high corrosion resistance and good wear resistance, thus making the valve have a long service life and a cost performance 10 times higher than ordinary valves.

[Product Features]

1. The raised gate sealing surface can scrape off the adhesive on the sealing surface and automatically clean up debris.

2. Stainless steel gate can prevent sealing leakage caused by corrosion.

3. The hard all gold sealing surface can ensure the sealing wear resistance performance and requirements.

4. The sealing surface of the valve body has no grooves, so there is no accumulation and it can ensure flexible opening.

5. Short structural length can save raw materials, installation space, and effectively support pipeline strength.

6. The scientific design of the upper sealing stuffing box ensures that the upper seal is safe, effective, and durable.

7. The triangular bracket saves raw materials and ensures the required mechanical properties.

8. The guide block on the valve body enables the gate to move correctly, while the four compression blocks ensure effective sealing of the gate.

9. The design of reinforcing ribs on the valve body improves its strength.

10. Stainless steel valve stem is durable, and double headed bolts make opening and closing faster.

11. The driving mechanism can be selected arbitrarily.

12. With a diameter of over 150 and a fully enclosed structure, it can effectively open and prevent leakage.

13. Fluororubber sealing surface can achieve sealing effect and increase the operating temperature.

14. The rubber sealing surface is directly vulcanized inside the valve body and will not come off.

【 Installation and usage instructions 】

Before installing the knife type gate valve, it is necessary to check the valve chamber and sealing surface, and no dirt or sand particles are allowed to adhere to them;

2. The bolts at each connection point should be tightened evenly;

3. Check that the filling part is tightly pressed to ensure both the sealing of the filling and the flexibility of the gate opening;

Before installing the valve, users must verify the valve model, connection size, and pay attention to the flow direction of the medium to ensure consistency with the valve requirements;

5. When installing valves, users must reserve necessary space for valve actuation;

6. The wiring of the driving device must be carried out according to the circuit diagram;

7. Knife gate valves must be regularly maintained and not collided or squeezed at will to avoid affecting the sealing.

[Usage and Maintenance]

1. Handwheels, handles, and transmission mechanisms are not allowed to be used for lifting and collisions are strictly prohibited.

2. Double gate valves should be installed vertically (i.e. with the valve stem in a vertical position and the handwheel at the top).

3. Before opening a gate valve with a bypass valve, the bypass valve should be opened first (to balance the pressure difference between the inlet and outlet and reduce the opening force).

4. Install the gate valve with transmission mechanism according to the instructions in the product manual.

5. If the valve is frequently opened and closed, lubricate it at least once a month.