Pneumatic Actuated Knife Gate Valve

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What is A Pneumatic Actuated Knife Valve

- What is a pneumatic Actuated knife valve? It is also known as pneumatic control shovel valve, English name is Pneumatic Knife Gate Valves / knife gate valve pneumatic actuator or knife gate valve pneumatic cylinder, is a device fitted with a pneumatic actuator, connecting the shaft to the body. of the knife valve, the vane is an iron metal that can go up and down completely out of the way of the fluid, single and vertical. The shaft is floating with pressure up to PN16, PN25.

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Structure of  Pneumatic Actuated Knife Valve

• Mechanical Valve:

The mechanical knife input part is made of steel, Body and Disc ( stainless steel, cast iron, Cast steel) . The mechanical valve part includes the following parts:

- Valve body: made of stainless steel 304, stainless steel 316, cast iron, steel

- Valve disc: The valve disc or blade will normally be made of stainless steel or steel.

- Valve shaft: The mechanical knife valve shaft is made of stainless steel or stainless steel with high hardness

- Sealing gasket: Pneumatic knife valve has 2 types of sealing: Teflon sealing and steel sealing. Steel gasket can withstand extreme temperature and pressure.

- Control part: normally the valve is controlled by compressed air or by handwheel. In hydroelectric and thermal power plants, the valve is usually controlled by electricity.

Mechanical Knife Valve

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• Actuator of valve:  This is the part that controls the opening and closing of the pneumatic knife valve with 7 main parts:

- Piston rod

- Mounting

- Cylinder

- Piston

- O-ring

- Rod-end port

- Cap-and port

Actuator of Knife Valve

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Operation of Knife Gate Valve

When we supply compressed air to the pneumatic cylinder, the gears in the cylinder rotate to push the valve shaft according to the up and down mechanism, the valve shaft will be connected to the blade. When compressed air is supplied to the upper port, the compressed air will be compressed. will push the valve shaft down, the blade attached to the valve shaft will go down and seal the flow, creating a valve closing mechanism. Conversely, when compressed air is supplied to the lower port, the compressed air will push the valve shaft up, pull the blade up, open the flow then create the valve opening mechanism. In addition, if the valve is connected to a linear controller, it can be opened and closed at an angle from 4 - 20mA.

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Advantages / Defect Pneumatic Operated Knife Valve

- The valve opens and closes quickly, the installation space is narrow, the space in the valve line of the pipe is quite narrow

- The pneumatic knife valve is sealed with a metal disc so it can cut other solid objects.

- Used for solid, sharp, viscous fluids

- The valve blade moves up and down, so the fluid pressure does not affect the opening and closing of the valve.

- When opening the valve, the valve blade retracts all the way up, so the valve disc does not block the flow of fluid through.

 

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Application of Pneumatic Operated Knife Valve

- Valves are widely used in systems of cement plants, batching plants

- Valves are widely used in sludge treatment systems

- Used in stone factories

- Used in industrial mines

- Widely used in hydroelectric and thermal power plants

- Used a lot in paper mills

- Application in sugar mills

- Application in flour mills

- Used in plastic factories

- Used in wood factories

- Widely used in tanks, tanks,...

- The main function of the pneumatic knife valve is to automatically operate and discharge water, residue, liquid, chemicals, coal, sugar and is specialized for the paper industry.

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