Product introduction:
Knife type gate valve is flat valve plate bottom with knife-type oblique incision, with the function of cutting off the medium, so that the valve is not blocked by the medium.
Knife type gate valve is also known as knife-type gate valve, knife-type slurry valve, its opening and closing parts are the gate, the direction of the movement of the gate is perpendicular to the direction of the fluid, and the knife-type gate valve can only be fully opened and fully closed, not adjusted and throttled.
Pneumatic knife gate valve matched with pneumatic actuator, it can driven easily by compressed air, with single acting or double acting function, with low starting torque, excellent sensitivity and sensing speed.
The gate has two sealing faces. The most common type of gate valve has two sealing faces that form a wedge. The wedge Angle varies with valve parameters and is usually 50.It can also be made into a gate that can produce slight deformation to improve its technology and compensate for the deviation of sealing face Angle in the process of processing. This gate is called an elastic gate.In fact, there is no chamber in the valve body, the gate in the side guide groove lifting, and by the bottom of the lug pressed on the seat, if you need to achieve a higher medium sealing, you can choose O seal seat to achieve two-way sealing.Knife gate valve has a small installation space, low working pressure, not easy to accumulate debris, low price.
When knife gate valve is closed, sealing surface can only rely on medium pressure to seal, that is, rely on medium pressure to press the sealing surface of the gate to the other side of the seat to ensure sealing surface, this is self-sealing.Most knife gate valves are force-sealed, that is, when the valve is closed, the gate is forced to the seat by external force to ensure the sealing surface sealing.Such valves should generally be installed horizontally in the pipeline.
This kind of valve is generally used for pulp, coal ash, chemical raw materials, sewage, food and other media circulation opening and closing.
Product specification:
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Diameter nominal DN(mm)
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40～1200
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Pressure nominal PN(MPa)
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0.6～1.0
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Pressure test
Ps (MPa)
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Strength test (Water)
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0.9～1.5
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Sealing test (Water)
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0.66～1.1
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Medium applicable
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Cement slurry, sand pulp, paper pulp, fiber pulp and other impurities in the mine pipeline
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Connection way
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Wafer, flange
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Driven method
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Electric actuator
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Product features:
1. Simple shape, super short structure length, save material, can greatly reduce the overall weight of pipeline system, wide application range.
2. Occupy a small effective space, can effectively support the strength of the pipeline, can reduce the possibility of pipeline vibration.
3. Austenitic stainless steel is selected for the gate, which greatly improves the corrosion resistance and can effectively prevent sealing leakage caused by the corrosion of the gate.
4. The upper sealing packing adopts flexible PTFE, reliable sealing, light and flexible operation.
5. The gate plate has the function of knife, which can effectively break all kinds of sundries in the medium.
6. If the use of hard seal stainless steel material, valve disc spray welding treatment, can be a good extension of the temperature and pressure requirements of the valve.
7. Open and close more energy saving, small fluid resistance, sealing surface by medium erosion and erosion.
8. Medium flow direction is not restricted, no turbulence, no pressure reduction.Durable and easy to use.
9. It is easy to cause erosion and abrasion between sealing surfaces, and maintenance is difficult.
10. Complex structure, large size, need a certain space to open, open and close for a long time.
Product Tags:
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Water Medium Type Full Round Straight Through Knife Gate Valve With Sealing Performance Images
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