How Does a Knife Gate Valve Work?

27th September, 2024

EATHU Valve has many years of experience in the valve industry, I use this article for you to explain the working principle of knife gate valve, if you have want to know more or want to discuss with us about the valve field stuff, welcome to contact me!


Introduction to the Basic Features of Knife Gate Valves:


Knife gate valve opening and closing member is the gate, the movement direction of the gate is perpendicular to the direction of the fluid, manual knife gate valve can only be used for full open and full closed, can not be used for regulation and throttling.

Gate has two sealing surfaces, the most commonly used mode gate valve two sealing surfaces to form a wedge, wedge angle with the valve parameters, usually 50, wedge knife gate valve gate can be made into a whole, called the rigid gate; can also be made to produce a small amount of deformation of the gate in order to improve its craftsmanship, to make up for the angle of the sealing surface of the bias in the machining process, this gate is called the elastic gate!


Knife gate valve closure, the sealing surface can only rely on media pressure to seal, that is, relying on media pressure will be the sealing surface of the gate to the other side of the valve seat to ensure that the sealing surface of the seal, this is the self-sealing.

Most knife gate valves are forced sealing, that is, when the valve is closed, to rely on external forces to force the gate to the valve seat to ensure that the sealing surface of the sealing surface of this type of valves in the pipeline should generally be installed horizontally.


The Structural Composition of Knife Gate Valve is Mainly Composed of the Following Parts:


Valve body:

Usually a piece of metal or alloy plate with a fluid passage, which can be manufactured with different materials to adapt to the working conditions of different media. 

Valve blade:

This is the key component of the knife gate valve, similar to a plate blade that can slide perpendicular to the fluid passage to open or close the valve. The blade is usually made of metal or polymer, and some are also lined to protect against corrosion and wear.

Operating Device:

Used to control the opening and closing of the valve blade. This can be a manually operated handwheel, handle or electric/pneumatic actuator, depending on the application and requirements.

Sealing Device:

Used to ensure a good seal between the valve blade and the valve seat to prevent fluid leakage. The seal is usually achieved by a compression action between the valve blade and the seat.


How Knife Gate Valves Work:


Knife gate valve controls the flow of fluid by moving the valve blade. Manual/pneumatic/electrical drive valve stem, drive the gate plate up and down movement, so as to control the flow of materials in the pipeline and flow direction.

When the gate moves upward, the flow of material through the valve increases; when the gate moves downward, the flow of material through the valve decreases. As the shape of the gate plate is similar to a blade, it can effectively cut off the material and prevent leakage.

Knife gate valve its gate has a shear function, can scrape the adhesion on the sealing surface, automatic removal of debris, stainless steel gate can prevent corrosion-induced seal leakage.


Conclusion:


EATHU is a year-round manufacturer and exporter of valves, we produce butterfly valves, gate valves, check valves, globe valves, etc. We offer a wide range of materials, cast iron, cast steel, stainless steel, carbon steel, etc., in accordance with the national standards, ANSI, API, JIS, DIN and so on.

In addition, EATHU can not only supply you with a variety of standard valves, but also provide related products, such as pipe fittings, flanges and other services, you can purchase the entire project here, you can also customize products, we can be based on your drawings and requirements, customized for you to better meet the project and working conditions of the product.

If you have more understanding of the valve, you are welcome to contact us, I sincerely invite you to discuss the valve industry issues and the future development of the valve industry.




ARTICLES of Knife Gate Valve

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